CISCO CCNA 4 FINAL kilka (1)

1 Refer to the exhibit. A network administrator is checking the status of router RTR_2. What is the most likely reason for the current status
of the serial link to RTR_1?
*A cable has become disconnected.
The circuit is experiencing excessive RFI.
Authentication is not properly configured on the routers.
The routers are configured for different WAN encapsulations.
The clock rate is not properly configured on one of the routers.

2 While testing a new network design in the lab, a network administrator is configuring a serial link that connects two routers back-to-back.
In order to finish the configuration, the administrator needs to identify which router is connected to the DCE end of the cable. What
command can be issued to provide this information?
router# show status serial 0/0
*router# show controllers serial 0/0
router# show protocols serial 0/0
router# show version
router# show interfaces serial 0/0

3 Which statements are correct about the point in the network where the responsibility of the service provider ends? (Choose three.)
*The International point is on the customer side of the network terminating unit(NTU).
*The United States point is at the interface of the customer-provided equipment and the local loop.
The responsibility for this point is controlled by IANA.
*The point is called the demarcation point.
The point is typically located at the service provider's central office.
The point is located between the customer's local area networks.

4 A system administrator must provide Internet connectivity for 25 hosts at an insurance agency. The ISP has assigned two public IP
addresses to this company. What can the administrator do to provide Internet access to all 25 users at the same time?
*Configure the router with dynamic NAT with PAT.
Configure the router with dynamic NAT for 25 users.
Configure the router with DHCP and static NAT.
Configure the router with static NAT for all 25 users.
This cannot be done with only two public addresses.

5 A system administrator is unable to ping the Serial0/0 interface of RouterB from RouterA. During the troubleshooting process, the
following facts are established: - IP addressing and subnet masks are correct. - RouterA is a Cisco router and RouterB is a router from
another vendor. - RouterA is configured with the default encapsulation. - The serial interfaces on both routers are up. - The protocol is down
on the serial interfaces of both routers. What should the administrator do to solve the problem?
Add a clock rate on RouterA.
Enable the serial interface on RouterB.
*Change the encapsulation on both routers to PPP.
Connect the serial cable to the correct interface on RouterB.
Use the correct serial cable to attach the CSU/DSU to RouterB.

6 A network administrator must provide WAN connectivity between the Central office and three remote sites: East Branch, West Branch,
and Remote. The East Branch and West Branch offices receive sales orders and transmit shipping confirmations to the Central office
consistently throughout the day. The Remote office is staffed by one salesperson who travels through the northwestern territory. The
salesperson occasionally needs to connect to the Central office for e-mail access. How should the network administrator connect these sites
to the Central office? (Choose two.)
Connect the East Branch and West Branch remote offices with ISDN connections.
*Connect the East Branch and West Branch offices with Frame Relay connections.
Connect the East Branch and West Branch offices with POTS dial-up connections.
Connect the Remote office with a Frame Relay connection.
Connect the Remote office with an ISDN connection.
*Connect the Remote office with a POTS dial-up connection.

7 A system administrator needs to configure the regional office with ISDN for DDR connections to three remote sites. Each remote site
requires different IP subnets, different encapsulations, and different authentication methods. The sites will not be connected at the same time.
The company would like to accomplish this in the most cost effective manner. What method can the system administrator use to accomplish
this task using the fewest B channels?
Install and configure a PRI.
Install and configure a BRI interface with separate SPIDs for each remote site.
Install and configure a BRI with multiple switch types in global configuration.
*Install and configure a BRI using dialer profiles.
Install and configure a separate BRI for each remote site.

*PPP encapsulation is recommended for serial links between equipment from multiple vendors.
Usernames must be configured at both ends of the HDLC serial link.
The HDLC vendor type must be enabled on the Cisco router.
There is a mismatch in the HDLC authentication password configurations.

9 Which of the following is the order for the three phases of establishing a PPP serial link with authentication?
authentication, link-establishment, network layer protocols
authentication, network layer protocols, link-establishment
network layer protocols, link-establishment, authentication
network layer protocols, authentication, link-establishment
*link-establishment, authentication, network layer protocols
link-establishment, network layer protocols, authentication

10 The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue explains why
the link is unable to establish a PPP session?
The IP addresses must be on different subnets.
*The usernames are misconfigured.
The passwords must be different for the CHAP authentication.
The clock rate must be 56000.
The clock rate is configured on the wrong end of the link.
Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.

11 Refer to the exhibit. The link between the RTR-1 and RTR-2 routers is configured as shown in the exhibit. Although the show interfaces
command shows the interface status as Serial0 is up, line protocol is up, IP traffic is not crossing this link. What is the problem?
The usernames are misconfigured.
The clock rate is configured on the wrong end of the link.
*The IP addresses are not in the same subnet.
Interface serial 0/0 on RTR-1 must connect to interface serial 0/1 on RTR-2.
The passwords must be different for the CHAP authentication.
The clock rate must be 56000.

12 A technician enters the interface serial 0/0.1 multipoint command when configuring a router. What effect will the multipoint keyword
have in this configuration? (Choose two.)
*Split-horizon issues will need to be resolved for this network if RIP is the routing protocol.
A subinterface will be defined for each PVC.
*All the participating interfaces of remote routers will be configured in the same subnet.
A single DLCI will be used to define all the PVCs to the remote routers.
An IP address will need to be configured on the main interface.

13 Which router command would be used to associate a Layer 2 address with the corresponding Layer 3 address in the internetwork in the
diagram?
RouterA(config-if)#frame-relay pvc 100 192.168.15.2
RouterA(config-if)#dialer-map ip 192.168.15.1 100 broadcast
*RouterA(config-if)#frame-relay map ip 192.168.15.2 100 broadcast
RouterA (config-if)#dialer-map 192.168.15.1 101 serial 0 broadcast
RouterA (config-if)#frame-relay dlci 101 192.168.15.1 broadcast
RouterA (config-if)#dialer-map 192.168.15.1 inverse-arp broadcast

14 Refer to the exhibit. Two routers are connected through a Frame Relay point-to-point PVC. The ILM-5 router is from a vendor other
than Cisco. Which interface command is required to configure the link between the Cisco ILM-3 router and router ILM-5?
ILM-3(config-if)# encapsulation frame-relay cisco
ILM-3(config-if)# frame-relay pvc multipoint
*ILM-3(config-if)# encapsulation frame-relay ietf
ILM-3(config-if)# frame-relay lmi-type ansi

ILM-3(config-if)# frame-relay pvc point-to-point

15 What does the output of the show frame-relay map command shown below represent? (Choose two.) Serial 0 (up): ip 172.30.151.4 dlci
122, dynamic, broadcast, status defined, active
*172.30.151.4 represents the IP address of the remote router.
172.30.151.4 represents the IP address of the local serial interface.
DLCI 122 represents the interface of the remote router.
*broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets across this PVC.
dynamic indicates that a dynamic routing protocol is enabled for this connection.
active indicates that the ARP process is working.

16 The output of the show interfaces serial 0/0 command for a frame-relay connection indicates that the serial line is up but the line protocol
is down. What are possible causes for this? (Choose two.)
*There is an LMI-type mismatch between the Frame Relay switch and the router.

*There is no clock present on the serial interface.
The interface is shut down.
RARP is not functioning on the router.
The cable is disconnected.

17 What are two ways to resolve split-horizon issues in a Frame Relay network? (Choose two.)
*create a full-mesh topology
disable Inverse ARP
*use point-to-point subinterfaces
use multipoint subinterfaces
remove the broadcast keyword from the frame-relay map command

18 A network administrator issued the command show frame-relay pvc. The response from the router shows the status of a PVC as deleted.
What is the reason for this output?
The DLCI is using the wrong LMI type.
The DLCI is usable but has little activity.
The DLCI is programmed in the switch but the circuit is not usable.

*The DLCI was formerly programmed in the switch but is no longer there.

19 When a Frame Relay switch detects an excessive buildup of frames in its queue, which of the following may occur? (Choose two.)
*Frames with the DE bit set are dropped from the switch queue.
Frames with the FECN and BECN bits set are dropped from the switch queue.
Frames in excess of the CIR are not accepted by the switch.
The switch sets the FECN bit on all frames it places on the congested link and sets the BECN bit on all frames it receives on the congested
link.
*The switch sets the FECN bit on all frames it receives on the congested link and sets the BECN bit on all frames it places on the congested
link.

20 What are two of the steps required to configure a router to connect over ISDN BRI? (Choose two.)
Configure the interface with a DLCI.
*Configure the SPIDs, if required by the ISDN switch.
Specify the the LMI type to be compatible with the CO switch.
Set the interface encapsulation to the Cisco or IETF frame type.
Configure a subinterface for each B channel.

*Set the switch type to work with the ISDN switch at the CO.

21 After the ISDN BRI interface is configured, which command can be used to verify that the router is communicating correctly with the
ISDN switch?
show dialer
*show isdn status
show interfaces bri0/0:1
show interfaces serial0/0.1

22 Which of the following ISDN protocols is responsible for call setup and call teardown?
ITU-T Q.921
*ITU-T Q.931
ITU-T I.430
ITU-T I.431

23 Which protocol should be chosen to support WAN connectivity in a multi-vendor system and provide strong security through
authentication?
NAT with DHCP
Frame Relay
HDLC with encryption
HDLC with CHAP
PPP with PAP
*PPP with CHAP

24 Which of the following describes the roles of devices in a WAN? (Choose three.)
*A CSU/DSU terminates a digital local loop.
A modem terminates a digital local loop.
A CSU/DSU terminates an analog local loop.
*A modem terminates an analog local loop.
*A router is commonly considered a DTE device.

A router is commonly considered a DCE device.

25 Which scenarios present possible reasons for using the frame-relay map command when configuring a Frame Relay connection? (Choose
two.)
*when dynamic mapping of DLCIs to IP addresses is not supported by the remote router
when the local router is using IOS Release 11.1 or earlier
when the remote router is a non-Cisco router
when globally significant rather than locally significant DLCIs are being used
*when broadcast traffic and multicast traffic over the PVC must be controlled

26 Below is a list of DDR steps. Which of the following identifies the proper order of DDR? 1 - dial number is looked up2 - interesting
traffic triggers DDR3 - route to destination is determined4 - call is made
1,2,3,4
1,3,2,4
2,3,1,4
2,1,3,4
*3,2,1,4
3,1,2,4

27 What causes a DDR call to be placed?
dial string
DLCI
idle time out
*interesting traffic
PVC

28 After configuring a dialup ISDN circuit, a network associate begins testing the dialup connection. When attempting to ping a host on the
remote network, the local router does not attempt to dial the remote access server. Which of the following are possible errors in this
configuration? (Choose three.)
PPP authentication is not properly configured.
*No dialer map is configured.
The ISDN circuit connected to the remote access server is busy.
*No interesting traffic is defined.
*No route is determined to the remote network.

A wrong number is configured in the dial string.

29 A branch office reports excessive connect time charges for an ISDN circuit used to connect to the regional office. Upon investigation of
this issue, it is discovered that when an ISDN connection is initiated to the regional office it remains connected for an excessive amount of
time. Which of the following configuration changes could be made to DDR on the router to reduce these connect time charges?
use PPP multilink
*lower idle timer setting
use CHAP authentication
change DDR from legacy to dialer profiles

30 An ISDN circuit from a branch office is remaining connected to the regional office. A network administrator determines a user has
initiated a continuous ping from a desktop computer to the regional office. Which configuration change would allow the ISDN circuit to
disconnect during any attempts to ping, while otherwise functioning properly?
change DDR from legacy to dialer profiles
remove the dialer list statement from the configuration
*change the dialer list to exclude ICMP as interesting
disable inverse ARP

31 What value in the address field of a Frame Relay header identifies the destination of the frame?
CIR
DE
*DLCI
ISDN
FRAD
PVC

32 Refer to the exhibit. The network administrator of the Denver router has determined that the DHCP clients on the network are not
working properly. The clients are receiving IP configuration information from a DHCP server configured on the router but cannot access the
Internet. From the output in the exhibit, what is the most likely problem?
The DHCP server service is not enabled.
The DHCP pool is not bound to the interface.
The inside interface for DCHP is not defined.
*The pool does not have a default router defined for the clients.
All the host addresses have been excluded from the DHCP pool.
Scoring Rule For: correctness of response
2 points for Option 4
0 points for any other option

Max Value = 2
This item references content from the following areas:
CCNA 4 WAN Technologies
# 1.2.5 Configuring DHCP

33 Which circuit-switched WAN technology is often used to provide a backup for a leased line and additional capacity during peak usage
times?
X.25
DSL
*ISDN
cable modem

34 A system administrator is troubleshooting a connectivity issue between two routers in a new installation. The administrator enters the
debug ppp authentication command on the WHSE router. The graphic shows a part of the output received. From this output, what is the most
likely cause of this connectivity issue?
There is not a route to the remote router.
The ISDN circuit on the remote router has failed.
*The username/password was not properly configured on the WHSE router.
The remote router has a different authentication protocol configured.

35 Which IP addresses are defined by RFC 1918 as private addresses? (Choose three.)
172.55.16.0.16
*172.17.0.0/16
224.200.175.0/24
*192.168.168.0/22
*10.88.179.0/29
17.250.0.0/16

36 What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco 806 broadband router?
defines which addresses are allowed out of the router
defines which addresses are allowed into the router
*defines which addresses can be translated
defines which addresses are assigned to a NAT pool

37 Refer to the exhibit. Which statements describe why the workstation with the IP address 192.168.89.99 cannot access the Internet?
(Choose two.)
The NAT outside interface is not configured properly.
*The NAT inside interface is not configured properly.
The access control list does not include the IP address 192.168.1.99/28 to access the Internet.
The NAT pool is not properly configured to use routable outside addresses.
*The NAT pool is not properly configured to use the access control list for NAT.

38 Which of the following statements are correct regarding PAT? (Choose two.)
PAT is the best method to provide consistent global addresses for network servers.
PAT can only be configured to use one IP address, which is usually the IP address of the serial interface of the router.
PAT uses unique source port numbers on the inside local IP address to distinguish between translations.
*PAT uses unique source port numbers on the inside global IP address to distinguish between translations.
*When PAT is configured to use a pool of IP addresses and exhausts the ports of the first IP address, the router will move to the next
available IP address.

39 How are the settings for ISDN switch type and SPIDs determined for a BRI interface configuration?
assigned by the network administrator
randomly, so long as they are not duplicated on the network
by trial and error
dynamically via Inverse ARP
assigned by IANA
*assigned by the service provider

40 When configuring a Frame Relay network with subinterfaces, which commands are configured on the subinterface? (Choose three.)
*frame-relay interface-dlci
encapsulation frame-relay ietf
*ip address
*frame-relay map
switch type

1 Refer to the exhibit. A network administrator is checking the status of router CTL-1. What is the most likely reason for the current status

of the serial link to CTL-2?
The circuit is suffering from excessive RFI.

Authentication is not properly configured on the routers.
The routers are configured for different WAN encapsulations.
The clock rate is not properly configured on one of the routers.
*A cable has become disconnected.

2 While prototyping an internetwork in the corporate lab, a network administrator is testing a serial link between serial 0/0 interfaces on two
routers. The labels on the serial cable ends have been damaged and are unreadable. What command can be issued to determine which router
is connected to the DCE cable end?
show interfaces serial 0/0
show version
*show controllers serial 0/0
show protocols serial 0/0
show status serial 0/0

3 Where in the network does the responsibility of the service provider end? (Choose three.)
*at the demarcation point
between the customer's local-area networks
*outside of the United States, on the customer side of the network terminating unit (NTU)
at the service provider's central office
*in the United States, the connection of the customer-provided equipment and the local loop
at the point in the network where NAT occurs

4 A system administrator must provide Internet connectivity for ten hosts in a small remote office. The ISP has assigned two public IP
addresses to this remote office. How can the system administrator configure the router to provide Internet access to all ten users at the same
time?
Configure static NAT for all ten users.
Configure dynamic NAT for ten users.
*Configure dynamic NAT with PAT.
Configure DHCP and static NAT.
What the administrator wants to do cannot be done.

5 Refer to the exhibit. A system administrator is unable to ping the S0 interface of the West router from the East router. During the
troubleshooting process, the following facts are established: - IP addressing and subnet masks are correct. - East is a Cisco router and West is
a router from another vendor. What should the administrator do to solve the problem?
Enable the serial interface on West.
*Change the encapsulation on both routers to PPP.
Add a clock rate on East.
Replace the serial cable used to attach the CSU/DSU to West.
Set the loopback interface on East.

6 A network administrator must provide WAN connectivity between a central office and three remote sites: Orlando, Atlanta, and Phoenix.
The Orlando and Atlanta remote offices receive sales orders and transmit shipping confirmations to the Central office consistently
throughout the day. The Phoenix remote office consists of one salesperson traveling through the southwest territory. The salesperson
occasionally needs to connect to the Central office for e-mail access. How should the network administrator connect the remote sites to the
Central office? (Choose two.)
*Connect to the Atlanta and Orlando remote offices with Frame Relay connections.
Connect to the Atlanta and Orlando remote offices with ISDN connections.
Connect to the Atlanta and Orlando remote offices with POTS dial-up connections.
Connect to the Phoenix remote office with a Frame Relay connection.
*Connect to the Phoenix remote office with a POTS dial-up connection.

8 A network administrator is having difficulty in establishing a serial link between a Cisco router and a router from another vendor. Both
routers are configured for HDLC encapsulation. Which statements are true regarding this configuration? (Choose two.)
*The Cisco HDLC frame uses a proprietary "Type" field that may not be compatible with equipment of other vendors.
HDLC requires a clock rate to be configured on the routers at both ends of the serial link.
*PPP encapsulation is recommended for serial links between equipment from multiple vendors.
Usernames must be configured at both ends of the HDLC serial link.
The HDLC vendor type must be enabled on the Cisco router.
There is a mismatch in the HDLC authentication password configurations.

10 Refer to the exhibit. The link between the CTRL and BR_1 routers is configured as shown in the exhibit. Why are the routers unable to
establish a PPP session?
The CHAP passwords must be different on the two routers.
The clock rate must be 56000.
Interface serial 0/0 on CTRL must connect to interface serial 0/1 on BR_1.
The IP addresses are on different subnets.
*The usernames are misconfigured.
The clock rate is configured on the wrong end of the link.

11 The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue will prevent IP
traffic from crossing this link?
The passwords must be different for the CHAP authentication.
The usernames are misconfigured.
The clock rate must be 56000.
The clock rate is configured on the wrong end of the link.
*The IP addresses must be on the same subnet.
Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.

13 Refer to the exhibit. A technician is configuring router Corp-1 to connect to router Corp-2 across the network shown in the graphic.
Which router command will associate a Layer 2 address with the corresponding Layer 3 address in order to provide connectivity between the
two routers?
Corp-1(config-if)# dialer-map ip 198.18.10.249 205 broadcast
Corp-1(config-if)# dialer-map 198.18.10.249 105 serial 0 broadcast
Corp-1(config-if)# dialer-map 198.18.10.250 inverse-arp broadcast
Corp-1(config-if)# frame-relay pvc 205 198.18.10.250
*Corp-1(config-if)# frame-relay map ip 198.18.10.250 205 broadcast
Corp-1(config-if)# frame-relay dlci 105 198.18.10.249 broadcast

14 Two routers are connected through a Frame Relay, point-to-point PVC. The remote router is from a vendor other than Cisco. Which
interface command is required to configure the link between the Cisco router and the other router?
frame-relay pvc multipoint
frame-relay pvc point-to-point
encapsulation frame-relay cisco
*encapsulation frame-relay ietf
frame-relay lmi-type ansi

15 The command show frame-relay map gives the following output: Serial 0 (up): ip 192.168.151.4 dlci 122, dynamic, broadcast, status
defined, active Which statements represent what is shown?(Choose two.)
*192.168.151.4 represents the IP address of the remote router.
192.168.151.4 represents the IP address of the local serial interface.
DLCI 122 represents the interface of the remote serial interface.
*DLCI 122 represents the local number used to connect to the remote address
broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets across this PVC.
active indicates that the ARP process is working

The cable is disconnected.

17 What can be done to Frame Relay to resolve split-horizon issues? (Choose two.)
Disable Inverse ARP.
*Create a full-mesh topology.
Develop multipoint subinterfaces.
*Configure point-to-point subinterfaces.
Remove the broadcast keyword from the frame-relay map command.

18 What does the status inactive indicate in the output of the show frame-relay pvc command?
*The DLCI is programmed in the switch but is not usable.
The DLCI was formerly programmed in the switch but is no longer there.
The DLCI is usable but has little activity.
The DLCI has been renamed for that PVC.

19 What can occur when a Frame Relay switch detects its queue filling faster than it can process data? (Choose two.)
Frames in excess of the CIR are not accepted by the switch.
*Frames with the DE bit set are dropped from the switch queue.
Frames with the FECN and BECN bits set are dropped from the switch queue.
*The switch sets the FECN bit on all frames it receives on the congested link and sets the BECN bit on all frames it places on the congested
link.
The switch sets the FECN bit on all frames it places on the congested link and sets the BECN bit on all frames it receives on the congested
link.

20 Which of the following are valid steps for a basic ISDN BRI configuration? (Choose two.)
create subinterfaces
define the LMI type
*set the SPIDs if required by the ISDN switch
set the interface DLCI
*set the switch type

specify the encapsulation as either Cisco or IETF

22 Which ISDN protocol is specifies the data-link processes of LAPD?
ITU-T I.430
ITU-T I.431
*ITU-T Q.921
ITU-T Q.931

25 When configuring a Frame Relay connection, when should a static Frame Relay map be used? (Choose two.)
when the remote router is a non-Cisco router
*when the remote router does not support Inverse ARP
when the local router is using IOS Release 11.1 or earlier
*when broadcast traffic and multicast traffic over the PVC must be controlled

when globally significant rather than locally significant DLCIs are being used

26 The exhibit represents steps to initiate a DDR call. Which option lists the steps in the proper order?
1,3,2,4
2,3,1,4
*2,3,4,1
3,4,1,2
4,1,3,2
4,2,3,1

27 What causes a DDR call to be placed?
dial string
DLCI
idle time out
*interesting traffic
PVC

31 What value in the address field of a Frame Relay header identifies the destination of the frame?
CIR
DE
*DLCI
ISDN
FRAD
PVC

32 A network technician determines DHCP clients are not working properly. The clients are receiving IP configuration information from a
DHCP server configured on the router but cannot access the Internet. From the output in the graphic, what is the most likely problem?
The DHCP server service is not enabled.
The inside interface for DCHP is not defined.
The DHCP pool is not bound to the interface.
*The pool does not have a default router defined for the clients.
All the host addresses have been excluded from the DHCP pool.

33 Which WAN technology is built on a cell-based rather than a frame-based architecture?
ISDN
Frame Relay
X.25
*ATM

35 Which of the following IP addresses are defined by RFC 1918 as private addresses? (Choose three.)
*192.168.146.0/22
172.10.25.0/16
*172.31.0.0/16
20.0.0.0/8
*10.172.92.8/29

36 What functionality do access control lists provide when implementing dynamic NAT on a Cisco router?
defines which addresses are excluded from the NAT pool
defines which addresses are assigned to a NAT pool
defines which addresses are allowed out of the router
*defines which addresses can be translated

37 Given the partial router configuration in the graphic, why does the workstation with the IP address 192.168.1.153/28 fail to access the
Internet? (Choose two.)
*The NAT inside interfaces are not configured properly.
The NAT outside interface is not configured properly.
*The router is not properly configured to use the access control list for NAT.
The NAT pool is not properly configured to use routable outside addresses.
The access control list does not include the IP address 192.168.1.153/28 to access the Internet.

38 Which statements describe NAT? (Choose two.)
*NAT hides the internal IP addressing structure from untrusted networks and conserves routable addresses.
Only one pool of routable addresses can be assigned per router interface.
*NAT can cause applications that depend on addressing, rather than domain names, to fail to function properly.
Cisco IOS NAT supports important protocols such as ICMP, FTP, BOOTP, and SNMP.
When using dynamic NAT, the number of hosts that can access the outside network is limited to the number of private addresses in the NAT
pool.

1 Which of the following describes the roles of devices in a WAN? (Choose three.)

*** A CSU/DSU terminates a digital local loop.

A modem terminates a digital local loop.

A CSU/DSU terminates an analog local loop.

*** A modem terminates an analog local loop.

*** A router is commonly considered a DTE device.

A router is commonly considered a DCE device.

2 What value in the address field of a Frame Relay header identifies the destination of the frame?

CIR

*** DLCI

ISDN

FRAD

PVC

3 The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue explains why the
link is unable to establish a PPP session?

The IP addresses must be on different subnets.

*** The usernames are misconfigured.

The passwords must be different for the CHAP authentication.

The clock rate must be 56000.

The clock rate is configured on the wrong end of the link.

Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.

4 The output of the show interfaces serial 0/0 command for a frame-relay connection indicates that the serial line is up but the line protocol
is down. What are possible causes for this? (Choose two.)

*** There is an LMI-type mismatch between the Frame Relay switch and the router.

There is no clock present on the serial interface.

The interface is shut down.

RARP is not functioning on the router.

*** The cable is disconnected.

5 Which statements are correct about the point in the network where the responsibility of the service provider ends? (Choose three.)

*** The International point is on the customer side of the network terminating unit(NTU).

*** The United States point is at the interface of the customer-provided equipment and the local loop.

The responsibility for this point is controlled by IANA.

*** The point is called the demarcation point.

The point is typically located at the service provider's central office.

The point is located between the customer's local area networks.

6 While prototyping an internetwork in the corporate lab, a network administrator is testing a serial link between serial 0/0 interfaces on two
routers. The labels on the serial cable ends have been damaged and are unreadable. What command can be issued to determine which router
is connected to the DCE cable end?

show interfaces serial 0/0

show version

*** show controllers serial 0/0

show protocols serial 0/0

show status serial 0/0

7 A network technician determines DHCP clients are not working properly. The clients are receiving IP configuration information from a
DHCP server configured on the router but cannot access the Internet. From the output in the graphic, what is the most likely problem?

The DHCP server service is not enabled.

The inside interface for DCHP is not defined.

*** The DHCP pool is not bound to the interface.

The pool does not have a default router defined for the clients.

All the host addresses have been excluded from the DHCP pool.

8 A technician enters the interface serial 0/0.1 multipoint command when configuring a router. What effect will the multipoint keyword have
in this configuration? (Choose two.)

*** Split-horizon issues will need to be resolved for this network if RIP is the routing protocol.

A subinterface will be defined for each PVC.

*** All the participating interfaces of remote routers will be configured in the same subnet.

A single DLCI will be used to define all the PVCs to the remote routers.

An IP address will need to be configured on the main interface.

9 When configuring a Frame Relay connection, when should a static Frame Relay map be used? (Choose two.)

when the remote router is a non-Cisco router

*** when the remote router does not support Inverse ARP

when the local router is using IOS Release 11.1 or earlier

*** when broadcast traffic and multicast traffic over the PVC must be controlled

when globally significant rather than locally significant DLCIs are being used

10 Which router command would be used to associate a Layer 2 address with the corresponding Layer 3 address in the internetwork in the
diagram?

RouterA(config-if)#frame-relay pvc 100 192.168.15.2

RouterA(config-if)#dialer-map ip 192.168.15.1 100 broadcast

*** RouterA(config-if)#frame-relay map ip 192.168.15.2 100 broadcast

RouterA (config-if)#dialer-map 192.168.15.1 101 serial 0 broadcast

RouterA (config-if)#frame-relay dlci 101 192.168.15.1 broadcast

RouterA (config-if)#dialer-map 192.168.15.1 inverse-arp broadcast

11 Which of the following ISDN protocols is responsible for call setup and call teardown?

*** ITU-T Q.921

ITU-T Q.931

ITU-T I.430

ITU-T I.431

12 What are two ways to resolve split-horizon issues in a Frame Relay network? (Choose two.)

*** create a full-mesh topology

disable Inverse ARP

*** use point-to-point subinterfaces

use multipoint subinterfaces

remove the broadcast keyword from the frame-relay map command

13 What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco 806 broadband router?

defines which addresses are allowed out of the router

*** defines which addresses are allowed into the router

defines which addresses can be translated

defines which addresses are assigned to a NAT pool

14 A system administrator is unable to ping the Serial0/0 interface of RouterB from RouterA. During the troubleshooting process, the
following facts are established:
- IP addressing and subnet masks are correct.
- RouterA is a Cisco router and RouterB is a router from another vendor.
- RouterA is configured with the default encapsulation.
- The serial interfaces on both routers are up.
- The protocol is down on the serial interfaces of both routers.

What should the administrator do to solve the problem?

Add a clock rate on RouterA.

Enable the serial interface on RouterB.

*** Change the encapsulation on both routers to PPP.

Connect the serial cable to the correct interface on RouterB.

Use the correct serial cable to attach the CSU/DSU to RouterB

15 An ISDN circuit from a branch office is remaining connected to the regional office. A network administrator determines a user has
initiated a continuous ping from a desktop computer to the regional office. Which configuration change would allow the ISDN circuit to
disconnect during any attempts to ping, while otherwise functioning properly?

change DDR from legacy to dialer profiles

remove the dialer list statement from the configuration

*** change the dialer list to exclude ICMP as interesting

disable inverse ARP

16 Below is a list of DDR steps. Which of the following identifies the proper order of DDR?

1 - dial number is looked up
2 - interesting traffic triggers DDR
3 - route to destination is determined
4 - call is made

1,2,3,4

1,3,2,4

2,3,1,4

2,1,3,4

*** 3,2,1,4

3,1,2,4

17 Which protocol should be chosen to support WAN connectivity in a multi-vendor system and provide strong security through
authentication?

NAT with DHCP

Frame Relay

HDLC with encryption

HDLC with CHAP

PPP with PAP

*** PPP with CHAP

18 Which of the following are valid steps for a basic ISDN BRI configuration? (Choose two.)

create subinterfaces

define the LMI type

*** set the SPIDs if required by the ISDN switch

set the interface DLCI

*** set the switch type

specify the encapsulation as either Cisco or IETF

19 A branch office reports excessive connect time charges for an ISDN circuit used to connect to the regional office. Upon investigation of
this issue, it is discovered that when an ISDN connection is initiated to the regional office it remains connected for an excessive amount of
time. Which of the following configuration changes could be made to DDR on the router to reduce these connect time charges?

use PPP multilink

lower idle timer setting

use CHAP authentication

*** change DDR from legacy to dialer profiles

20 A network administrator is having difficulty in establishing a serial link between a Cisco router and a router from another vendor. Both
routers are configured for HDLC encapsulation. Which statements are true regarding this configuration? (Choose two.)

*** The Cisco HDLC frame uses a proprietary "Type" field that may not be compatible with equipment of other vendors.

HDLC requires a clock rate to be configured on the routers at both ends of the serial link.

*** PPP encapsulation is recommended for serial links between equipment from multiple vendors.

Usernames must be configured at both ends of the HDLC serial link.

The HDLC vendor type must be enabled on the Cisco router.

There is a mismatch in the HDLC authentication password configurations.

21 Given the partial router configuration in the graphic, why does the workstation with the IP address 192.168.1.153/28 fail to access the
Internet? (Choose two.)

*** The NAT inside interfaces are not configured properly.

The NAT outside interface is not configured properly.

*** The router is not properly configured to use the access control list for NAT.

The NAT pool is not properly configured to use routable outside addresses.

The access control list does not include the IP address 192.168.1.153/28 to access the Internet.

22 The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue will prevent IP
traffic from crossing this link?

The passwords must be different for the CHAP authentication.

The usernames are misconfigured.

The clock rate must be 56000.

The clock rate is configured on the wrong end of the link.

*** The IP addresses must be on the same subnet.

Interface serial 0/0 on Left must connect to interface serial 0/1 on Right.

23 What causes a DDR call to be placed?

dial string

DLCI

idle time out

*** interesting traffic

PVC

24 Which two layers of the OSI model are described by WAN standards?

Application Layer, Physical Layer

*** Data Link Layer, Physical Layer

Data Link Layer, Transport Layer

Physical Layer, Network Layer

25 A technician is testing RouterA in the graphic. What is the condition of the circuit?

The routers are configured for different encapsulations.

*** The clock rate is not properly configured on the routers.

The circuit from WAN provider has failed.

Authentication is not properly configured on the routers.

The circuit is functioning properly.

26 A network administrator must provide WAN connectivity between a central office and three remote sites: Orlando, Atlanta, and Phoenix.
The Orlando and Atlanta remote offices receive sales orders and transmit shipping confirmations to the Central office consistently
throughout the day. The Phoenix remote office consists of one salesperson traveling through the southwest territory. The salesperson
occasionally needs to connect to the Central office for e-mail access. How should the network administrator connect the remote sites to the
Central office? (Choose two.)

*** Connect to the Atlanta and Orlando remote offices with Frame Relay connections.

Connect to the Atlanta and Orlando remote offices with ISDN connections.

Connect to the Atlanta and Orlando remote offices with POTS dial-up connections.

Connect to the Phoenix remote office with a Frame Relay connection.

*** Connect to the Phoenix remote office with a POTS dial-up connection.

27 When a Frame Relay switch detects an excessive buildup of frames in its queue, which of the following may occur? (Choose two.)

*** Frames with the DE bit set are dropped from the switch queue.

Frames with the FECN and BECN bits set are dropped from the switch queue.

Frames in excess of the CIR are not accepted by the switch.

The switch sets the FECN bit on all frames it places on the congested link and sets the BECN bit on all frames it receives on the congested
link.

*** The switch sets the FECN bit on all frames it receives on the congested link and sets the BECN bit on all frames it places on the
congested link.

28 A system administrator is troubleshooting a connectivity issue between two routers in a new installation. The administrator enters the
debug ppp authentication command on the WHSE router. The graphic shows a part of the output received. From this output, what is the most
likely cause of this connectivity issue?

There is not a route to the remote router.

The ISDN circuit on the remote router has failed.

*** The username/password was not properly configured on the WHSE router.

The remote router has a different authentication protocol configured

29 What does the output of the show frame-relay map command shown below represent? (Choose two.)
Serial 0 (up): ip 172.30.151.4 dlci 122, dynamic, broadcast, status defined, active

*** 172.30.151.4 represents the IP address of the remote router.

172.30.151.4 represents the IP address of the local serial interface.

DLCI 122 represents the interface of the remote router.

broadcast indicates that a dynamic routing protocol such as RIP v1 can send packets across this PVC.

*** dynamic indicates that a dynamic routing protocol is enabled for this connection.

active indicates that the ARP process is working.

30 What does the status inactive indicate in the output of the show frame-relay pvc command?

*** The DLCI is programmed in the switch but is not usable.

The DLCI was formerly programmed in the switch but is no longer there.

The DLCI is usable but has little activity.

The DLCI has been renamed for that PVC.

31 Which of the following IP addresses are defined by RFC 1918 as private addresses? (Choose three.)

*** 192.168.146.0/22

172.10.25.0/16

*** 172.31.0.0/16

20.0.0.0/8

*** 10.172.92.8/29

32 After configuring a dialup ISDN circuit, a network associate begins testing the dialup connection. When attempting to ping a host on the
remote network, the local router does not attempt to dial the remote access server. Which of the following are possible errors in this
configuration? (Choose three.)

PPP authentication is not properly configured.

*** No dialer map is configured.

The ISDN circuit connected to the remote access server is busy.

*** No interesting traffic is defined.

No route is determined to the remote network.

*** A wrong number is configured in the dial string

33 Two routers are connected through a Frame Relay, point-to-point PVC. The remote router is from a vendor other than Cisco. Which
interface command is required to configure the link between the Cisco router and the other router?

frame-relay pvc multipoint

frame-relay pvc point-to-point

encapsulation frame-relay cisco

*** encapsulation frame-relay ietf

frame-relay lmi-type ansi

34 Which circuit-switched WAN technology is often used to provide a backup for a leased line and additional capacity during peak usage
times?

X.25

DSL

*** ISDN

cable modem

35 After the ISDN BRI interface is configured, which command can be used to verify that the router is communicating correctly with the
ISDN switch?

show dialer

show isdn status

*** show interfaces bri0/0:1

show interfaces serial0/0.1

36 A system administrator needs to configure the regional office with ISDN for DDR connections to three remote sites. Each remote site
requires different IP subnets, different encapsulations, and different authentication methods. The sites will not be connected at the same time.

The company would like to accomplish this in the most cost effective manner. What method can the system administrator use to accomplish
this task using the fewest B channels?

Install and configure a PRI.

Install and configure a BRI interface with separate SPIDs for each remote site.

Install and configure a BRI with multiple switch types in global configuration.

*** Install and configure a BRI using dialer profiles.

Install and configure a separate BRI for each remote site.

37 A system administrator must provide Internet connectivity for ten hosts in a small remote office. The ISP has assigned two public IP
addresses to this remote office. How can the system administrator configure the router to provide Internet access to all ten users at the same
time?

Configure static NAT for all ten users.

*** Configure dynamic NAT for ten users.

Configure dynamic NAT with PAT.

Configure DHCP and static NAT.

What the administrator wants to do cannot be done.

38 Which of the following are characteristics of Frame Relay? (Choose two.)

circuit-switched

*** connection oriented

OSI Layer 3

*** packet-switched

reliable

39 Which of the following is the order for the three phases of establishing a PPP serial link with authentication?

authentication, link-establishment, network layer protocols

authentication, network layer protocols, link-establishment

network layer protocols, link-establishment, authentication

network layer protocols, authentication, link-establishment

*** link-establishment, authentication, network layer protocols

link-establishment, network layer protocols, authentication

1 Which LMI types are available with Cisco routers?

ansi, cisco, HDLC
ansi, cisco, q933a
xansi, cisco, DLCI x
cisco, IETF

2 What does CIR designate in a Frame-Relay connection?

xGuaranteed rate that the service provider commits to providing x
Maximum data burst rate that the switch can handle
Number of simultaneous virtual circuits available from a service provider
Number of simultaneous DLCIs that can be established across the cloud

3 Which command creates a subinterface?

xRouter(config-if)# int s0.115 x
Router(config-if)# int s0 subinterface 115
Router(config-if)# subinterface 115
Router(config-if)# subinterface s0.115

4 What is Cisco's default encapsulation for serial lines?

ADSL
HDLC
xPPP x
SDLC

5 Which of the following authentication processes provides protection against playback attacks?

xCHAP x
DDI
PAP
TCP

6 What does the ISDN BRI provide?

23 B channels and one 64Kbps D channel
Total bit rate up to 1.536 Mbps
Two 56Kbps B channels and one 64Kbps D channel
xTwo 64Kbps B channels and one 16Kbps D channel x

7 Which type of handshaking occurs when using CHAP?

One-way
Two-way
xThree-way x
Four-way

8 Which of the following commands can you use to check LCP and NCP states when PPP is configured?

Show encapsulation
x Show interfaces x
Show running-configuration
Show version

9 Which device connects four-wire ISDN subscriber wiring to the conventional two-wire local loop?

xNT1 x
NT2
TE1
TE2

10 In which layer of the three-layer design model is policy-based connectivity implemented?

x Core x
Access
Distribution
Workgroup

11 Which type of device does PPP use to provide a reliable connection?

Switches
x Routers x
Concentrators
Hubs

12 Which protocol supports Network Management?

SMTP
NFS
xSNMP x
FTP

13 Which of the following commands displays current TCP/IP network connections?

Ping
Tracert
Telnet
x Netstat x

14 Regarding Frame Relay, which of the following statements is true?

You must use ANSI encapsulation when connecting to non-Cisco equipment.
You must use Cisco encapsulation when connecting to non-Cisco equipment.
xYou must use IETF encapsulation when connecting to non-Cisco equipment. x
You must use q933a encapsulation when connecting to non-Cisco equipment.

15 Which type of ACL only checks the source address?

Extended ACL
General ACL
Source ACL
xStandard ACL x

16 Which type of Frame Relay message is used to ensure that both sides will continue to see an active connection?

x Keepalives x
Call reference
Status-inquiry
Information element

17 Which utility shows the route a packet takes to reach its destination?

Netstat
Ping
Telnet
x Tracert x

18 What do routers use to maintain tables?

Broadcast forwarding
IP Tunneling
Routed protocols
x Routing protocols x

19 Which device, typically found in digital PBX's, performs Layer 2 and Layer 3 protocol functions?

NT1
x NT2 x
TE1
TE2

20 What does PPP use to establish, configure, and test the WAN link?

Network control program
Link control protocol
x Simple network management protocol x
Dynamic host configuration protocol

21 What is the encapsulation type on a router for a Novell network running version 3.12?

Novell-ether
x ARPA x
SNAP
SAP

22 When configuring ISDN on a router, if a SPID is a required, from whom is the SPID obtained?

Network administrator
User
x Service provider x
Internic

23 The point at which the CPE ends is known as what?

Point of presence
Local loop
DTE
x Demarcation x

24 What is a major advantage of circuit-switched networks over packet-switched networks?

It allows network devices to share a single point-to-point link.
It involves transmission of messages from node to node through a network.
It offers more flexibility and uses network bandwidth more efficiently.
x It offers users dedicated bandwidth that cannot be infringed upon by other users. x

25 Which command is used to configure an interface for PPP encapsulation?

router>encapsulation ppp
router#encapsulation ppp

router(config)#encapsulation ppp
x router(config-if)#encapsulation ppp x

26 In a hierarchical design which device is used for data path determination?

Hubs
Switches
x Routers x
Bridges

27 What is the name of the database generated by SNMP that contains network management information?

ICMP
x MIB x
RMON
TRAP

28 Which type of circuit would be used in situations where data transfer between devices is constant?

x Permanent Virtual Circuit x
Switched Virtual Circuit
Temporary Virtual Circui
Uniform Virtual Circuit

29 Which layers of the OSI model are WANs focused on?

Network and transport
x Physical and data link x
Network and data link
Physical and network

30 Which of the following is true regarding routing metrics?

All routing protocols use the same metrics.
IGRP uses bandwidth as its only metric.
x Routers compare metrics to determine the best route. x
The larger metric generally represents the better path.

31 When connecting two routers from different vendors using a dedicated point-to-point connection, which type of encapsulation should be
used?

Cisco
HDLC
x IETF x
PPP

32 Which of the following is an alternative to a dedicated WAN link?

X.25
x ISDN x
T1
DS3

33 What are leased or owned devices that reside at the subscriber's location?

CO Switch
x CPE x
Demarc
Local Loop

34 Which kind of data is carried on ISDN B channels?

Analog
Sideband signals
Signal and control
x Voice and data x

35 Which command is used to configure a subinterface that will forward broadcasts and routing updates?

router(config-if)#interface serial 1 multipoint
router(config-if)#interface serial 1 point-to-point
x router(config-if)#interface serial 1.1 multipoint x
router(config-if)#interface serial 1.1 point-to-point

36 Which command is used to display the hardware addresses in the arp cache?

tracert
x arp -a x
rarp -a
arp -s

37 Which methods do frame relay switches use to inform DTEs of congestion within the frame relay network?

CCP and LMI
CIR and LATE
DLCI and SPID
x FECN and BECN x

38 Switches that receive the entire frame before sending it, use which type of frame forwarding?

Cut-through
Receive and send
Copy and send
x Store-and-forward x

39 In Frame Relay, which field is used to ensure the integrity of the transmitted data?

DLCI
x FCS x
Frame Number
LMI

40 XYZ Company is considering online video training applications. Which issue is most important when deploying this application on the
network?

Equipment location
Business-critical traffic
WAN service selection
x Media selection x

41 Which device provides connection functions to an ISDN network for a non-ISDN terminal?

NT1
NT2
x TA x
TX

42 Which ISDN channel is used to establish call setup?

x Channel D x
Channel B
Channel Call setup
Channel C

43 Which of the following is the ISDN Layer 2 signaling protocol?

BRI
PRI
LAPA
x LAPD x

44 What is the reference point for a connection between a TA and a non-ISDN-compatible device?

x R x
S
T
U

45 What is used to indicate the beginning or end of a PPP frame?

Address bits
Control bits
Frame sequencing
x Flags x

46 Which OSI layer performs the following types of encapsulation: ISDN, Frame Relay, and HDLC?

Network
Session
x Data link x
Transport

47 What is a terminal that can connect directly to an ISDN network?

NT1
NT2
x TE1 x
TE2

48 What does remote monitoring use to gather data?

SNMP agent
x RMON probe x
SNTP server
MIB

49 A router is normally referred to as which type of device?

DCE
x DTE x
CPE
CO

50 What is the function of the service profile identifiers or SPIDs?

Replace the DLC number
Used instead of subnetting
x Identify line configuration x
Logical address of the ISDN router

51 ISDN voice/video/data channels operate at what speed?

16 kbps
28.8 kbps
32 kbps
x 64 kbps x

52 Connection-oriented services involve which three phases?

x Connection establishment, Data transfer, Connection termination x
Connection establishment, Data transfer, Flow control
Connection establishment, Flow control, Connection termination
Data transfer, Flow control, Connection termination

53 Which method does a router use to build a Frame Relay map?

ARP requests
RARP requests
x Inverse RARP requests x
Inverse ARP requests

54 Which of the following does CHAP use to increase security?

Password sent in clear text
x Periodic verification of identity x
Separate hostname on each router
Two-way handshake

ODPOWIEDZI NA MODULY 1-6 I

1 What is the default number of pings issued by a DHCP server to a pool address before sending the DHCPOFFER to a client?
one
* two
three
four
five

2 Refer to the graphic. Which command would allow the router to forward DHCP broadcasts from Host A to the DHCP server?
* ip helper-address
dhcp helper-address
dhcp relay-agent
dhcp-relay

3 Which of the following traffic types are supported by Cisco IOS NAT? (Choose two.)
Routing table updates
* ICMP
* FTP
BOOTP
SNMP

4 Users are complaining that they cannot attach to network resources. A technician has confirmed that clients are not properly receiving IP
configuration information through the DHCP process. The network administrator wants to watch the DHCP process while the technician tries
to release and renew addresses on the clients. Which command would the network administrator use to monitor the process of address
allocation?
show ip dhcp server statistics
show ip dhcp binding
* debug ip dhcp server events
debug ip dhcp binding

5 Given the accompanying graphic, which command would establish a group of 32 IP addresses that could be used to hide inside addresses
from the Internet?
ip nat pool Raleigh 10.0.0.32 10.0.0.63 netmask 255.255.255.224
ip nat pool Raleigh 10.0.0.32 10.0.0.63 netmask 255.255.255.240
* ip nat pool Raleigh 171.11.10.32 171.11.10.63 netmask 255.255.255.224
ip nat pool Raleigh 171.11.10.32 171.11.10.63 netmask 255.255.255.240

6 Given the accompanying diagram, which commands are necessary to implement PAT on the Raleigh router? (Choose four.)
*access-list 10 permit 192.168.10.0 0.0.0.255
access-list 10 permit 171.11.0.0 0.0.255.255
ip nat inside source static 192.168.10.1 171.11.0.0
*ip nat inside source list 10 interface S0 overload
*ip nat outside
*ip nat inside

7 A company was issued 207.48.12.8/29 as its registered address from its ISP. Which of the following is a solution that will allow Internet
access to 300 employees simultaneously?
VLSM to further subnet the registered address and create more IP addresses
normal subnetting on the Class C network and address the host
*RFC 1918 and port address translation
this is an impossible scenario because there are not enough addresses

8 The Raleigh router shown in the diagram is configured with PAT. Which of the following must be changed if the private network is
migrated to a 10.0.0.0 network? (Choose two.)
*E0 interface address
S0 interface address
*the access-list statement
the NAT outside interface
the NAT inside interface

9 What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco 806 broadband router?
defines which addresses are allowed out of the router
defines which addresses are allowed into the router
* defines which addresses can be translated
defines which addresses are assigned to a NAT pool

10 Which configuration parameters are provided by the dynamic allocation process of DHCP? (Choose three.)
* Gateway address
* DNS server
DHCP Server
* Subnet mask
Key server
ARP server

11 What is the purpose of the DHCPDECLINE message?
If the DHCP client received multiple DHCPOFFERs, it uses the DHCPDECLINE to refuse the offers it does not use.
If the DHCP server sends an IP configuration update that the DHCP client does not need, it uses the DHCPDECLINE to refuse the

information.
The DHCP server uses the DHCPDECLINE message to refuse a DHCP client's request for IP configuration information.
* If the DHCP client detects that the address supplied by the DHCP server is in use on the network, it uses the DHCPDECLINE to
refuse the offer.

12 Given the accompanying graphic, which statement would be applied to the S0 interface when configuring NAT on the Tampa router?
ip nat inside
* ip nat outside
ip pat inside
ip pat outside

13 What is true regarding the differences between NAT and PAT?
PAT uses the word "overload" at the end of the access-list statement to share a single registered address.
Static NAT allows an unregistered address to map to multiple registered addresses.
Dynamic NAT allows hosts to receive the same global address each time external access is required.
* PAT uses unique source port numbers to distinguish between translations.

14 What is the default lease time for addresses assigned to clients through Easy IP?
* twenty-four hours
forty-eight hours
one week
two weeks

15 Which of the following are broadcasts sent by a client to a DHCP server? (Choose two.)
* DHCPDISCOVER
DHCPRELEASE
DHCPACK
* DHCPREQUEST
DHCPOFFER

16 Given the accompanying graphic, which addresses could be assigned to traffic leaving S0 as a result of the statement ip nat pool Tampa
179.9.8.96 179.9.8.111 netmask 255.255.255.240? (Choose two.)
10.0.0.125
179.9.8.95
* 179.9.8.98
* 179.9.8.101
179.9.8.112

17 Which configuration information might a DHCPOFFER include? (Choose three.)
* IP address
* DNS server address
DHCP binding
* Lease time
DHCP database

18 Which of the following can be done to allow the users on the 10.0.0.0 network to communicate with the Web Server shown in the
graphic? (Choose two.)

* Configure the Miami router to use NAT.
Configure the Web Server with a private address.
* Configure the Miami router to use PAT.
Change the Internet link IP address of 128.56.0.0 to a private address.
Configure the Tampa router to use PAT.

19 A network administrator needs to configure a router to offer DHCP services. Assuming the router is operating with factory defaults and
the IOS supports DHCP, what must be done to start the DHCP service?
Use the global configuration command service dhcp.
Use the privileged command service dhcp start.
Use the start service dhcp command during the setup processes.
* Do nothing. The DHCP service is enabled by default during start up.

20 Given the accompanying debug output from a Cisco router, what kind of address is 10.10.10.3 with the IP identification number of
29855?
* inside local
inside global
outside local
outside global

21 In addition to assigning addresses from predefined pools, which other services can a DHCP server offer? (Choose three.)
*DNS server addresses
*domain names
global IP assignments
NAT translations
*WINS server addresses

1 Which statement is true regarding WAN technologies?
Most WANS use only one technology throughout the infrastructure such as ISDN, Frame Relay or ATM.
Data transfer speeds on the WAN are typically faster than the speeds on a LAN.
*WANs operate at the lower three layers of the OSI model.
WANs are unable to support the transfer of voice or video traffic.

2 Which of the following are disadvantages of circuit-switched networks? (Choose two.)
Data is subject to unpredictable delays while it waits for other subscribers to transmit data.
* The connection capacity is used inefficiently due to irregular traffic bursts.
Data delivery is less reliable because only connectionless delivery methods are used.
* Circuit-switched networks are more expensive for data traffic.
Circuit-switched networks are less expensive for 24/7 data traffic.

3 A company requires a WAN connection that will carry 64 kbps and allow fast call setup time. The connection does not need to carry video.
What is the best choice for this company?
ATM
ISDN BRI
X.25
* analog dialup

4 Which of the following is commonly used as Data Terminal Equipment?
ISDN
* modem
router
CSU/DSU

5 Why is it important to identify the type of traffic that will be carried on the WAN links before choosing a WAN technology?
to determine the routing protocol to be used on the WAN link
to determine the WAN topology
* to determine the requirements for latency and jitter
to determine the type of signaling protocol to be used on the WAN link

6 On which of the following are most Layer 2 WAN encapsulations based?
IP
PPP
* HDLC
SLIP
HSSI
CSU

7 Which term describes the cabling that connects the customer site to the nearest exchange of the WAN service provider?
CPE
CO
* local loop
DCE
DTE

8 A European company needs a low cost, dialup WAN connection to validate transactions for point-of-sale card readers. Which connection
type is commonly used for this situation?
ATM
* X.25
Frame Relay
Leased lines

9 Which of the following describes a packet-switched network using connection-oriented data transfer? (Choose two.)
* Each packet carries an identifier.
Each packet carries full addressing information.
Each switch in the route must evaluate the addressing information to determine where to send the packet.
* Each switch determines where to send the packet by examining tables in memory.
The addressing information is used to set switches along the route of data transfer to create a continuous copper circuit.

10 A large company already has a T1 leased line but this connection is inadequate at peak business hours. Furthermore, they would like a
backup WAN connection in case their leased line temporarily fails. What type of WAN connection is commonly used in this situation?
X.25
DSL
* ISDN
cable modem
56 kbps

11 Depending on the company size and geographical layout, there might be many end points on the company WAN. Why is it important to
identify all the end points of the WAN before choosing a WAN design?
to determine the routing protocol to be used on the WAN link
* to determine the WAN topology
to determine the requirements for latency and jitter
to determine the signaling protocol to be used on the WAN link

12 A new international company needs to have a design for WAN connectivity. The company will have at least five offices in every state in
the United States and Mexico. Some states will have as many as 20 offices. The branch offices will require constant contact with the services
of the main office. Which design model is best for WAN connectivity in this situation?
a mesh network of all branch WANs
a simple star topology connecting all branch LANs to a central router with multiple interfaces
a one layer design using Frame Relay links between LANs
* a three layer hierarchical topology interconnecting branch LANs within an area, the area LANs within a region, and connecting
the regions to form the core of the WAN

13 Which statements are correct regarding ATM connections? (Choose two.)
uses only PVCs
* is useful for video transfers
* has data rates beyond 155 Mbps
cells have 32 byte payload and a 5 byte overhead
mandates single virtual circuits on a single leased line connection

14 Which of the following is true of WANs?
Shared network WAN technologies such as Frame Relay and ATM are more expensive but offer less latency and jitter than dedicated lines.
ISDN is suitable for large enterprises.
* The more network devices that data has to pass through across the WAN, the more latency and less reliability the network will
experience.
WANs typically incorporate only one technology such as ISDN, Frame Relay, or ATM.

15 Which of the following connections will provide the equivalent of a T1/E1 connection and is intended for large businesses?
BRI
* PRI
DLCI
PSTN
POTS

16 A company only requires a WAN connection to transfer sales data from individual stores to the home office. All transfers will occur after
business hours. They estimate they will never need a connection faster than 56 kbps. Which type of connection is best for this company?
ATM
ISDN
* analog dialup
T1 Leased Line

17 Which of the statements regarding DSL are correct? (Choose three.)
DSL provides a consistent bandwidth of 2.154 Mbps.
DSL connections provide a fast dialup to establish a WAN connection.
* DSL connects the local loop to a digital subscriber line access multiplexer.
* DSL bandwidth varies and can exceed the bandwidth of a T1/E1 leased line.
* For DSL to function properly, the local loop must be less than 5.5 kilometers (3.5 miles).
DSL is a popular choice for enterprises that need to connect home users to the local network due to strong security

1 Which of the following describe functions of the Point-to-Point protocol with regards to the OSI model? (Choose three.)
PPP uses Layer 3 of the OSI model to establish and maintain a session between devices.
PPP operates at all layers of the OSI model.
*PPP uses the data link layer to configure such options as error detection and compression. ¡Ì
*PPP provides a mechanism to multiplex several network layer protocols. ¡Ì
PPP uses Network Control Protocols (NCP) to test and maintain connectivity between devices.
*PPP can be configured on both synchronous and asynchronous serial interfaces. ¡Ì

2 What can be concluded from the output shown in the graphic? (Choose three.)
A two-way handshake is occuring.
*The LCPs were already negotiated. ¡Ì
*The router can begin NCP negotiations. ¡Ì
The debug ppp negotiation command was executed.
*The debug ppp authentication command was executed. ¡Ì

3 Which command specifies a link quality over a PPP link?
ppp link 50
ppp link quality 60
ppp percentage 80
*ppp quality 90 ¡Ì

4 Refer to the output of the show interface Serial0/0 command in the graphic. How many NCPs have been established?
1
*2
3
4

5 Which authentication protocol can be spoofed to allow playback attacks?
MD5
CHAP

*PAP
NCP

6 Which of the following is an advantage of using time-division multiplexing (TDM) for transmitting data? (Choose two.)
It allows a single source to transmit over multiple data channels.
*Multiple sources can transmit over a single channel. ¡Ì
*Original data streams must be reconstructed at the destination. ¡Ì
TDM relies on Layer 3 protocols to operate.

7 Several tasks must occur before a link between two routers can pass data using PPP. Which of the following are required to establish and
maintain a PPP session between two routers?
configure each host with a PPP address
configure authentication between the two routers
* send LCP and NCP frames to negotiate configuration parameters ¡Ì
send hostname and password information between the two routers

8 Which of the following is a reason for using such protocols as PAP and CHAP?
to establish a PPP session
to provide error checking on a WAN link
* to restrict access to networks connected by serial and ISDN links
to provide a backup hostname and privilege mode password on the router

9 PPP uses several protocols for communication. Which of the following are options that the LCP protocol in the PPP architecture can
provide? (Choose two.)
* testing the quality of the link
routing packets between devices
assigning individual station addresses
configuring network layer protocols
* negotiating authentication options

10 How is the MD5 function valuable in authentication? (Choose two.)
* uses a one-way hash function
authentication occurs more rapidly
* challenges are unique
the remote router assumes control of frequency of challenge
the remote router assumes control of timing of challenge

11 A technician has used Telnet to gain remote access to a router that has no connectivity on its serial interface. Which command should be
issued to determine if the serial cable is connected properly?
* show controllers
show processes
show run
show status

12 Which advantage does the multilink option provide when using PPP?
* Data transmission has load balancing possibilities.
Interfaces can be configured using both HDLC and PPP.
More than one authentication method can be used.
More than one compression protocol can be configured.

13 Which of the following describes the CHAP protocol? (Choose three.)
* exchanges a random challenge number during the session to verfiy identity
sends authentication password to verify identity
*prevents transmission of login information in plain text
*disconnects the PPP session if authentication fails
initiates a two-way handshake

14 How did Cisco alter the HDLC encapsulation to allow a single link to carry multiple protocols?
split the transmissions into multiple channels each carrying a single protocol
identified the protocol in the FCS field
compressed the datagrams differently for each protocol
* added a type field to identify the protocol

15 A technician is testing the functionality of a recently installed router. The technician is unable to ping the serial interface of a remote
router. The technician executes the show interface serial 0/0 command on the local router and receives the following output:
Serial0/0 is up, line protocol is down(disabled)
What are possible causes for this command output? (Choose two.)

interface missing the no shutdown command
clockrate command missing
*CSU/DSU failed
*interface shutdown due to high error rate
cable missing

16 Which command was used to display the partial output shown in the graphic?
show ppp traffic

show lcp traffic
* debug ppp negotiation
debug ppp authentication

17 Which of the following describes the High-Level Data Link Control protocol? (Choose three.)
* HDLC provides flow and error control.
Standard HDLC supports multiple protocols on a single link.
* HDLC uses sequencing and acknowledgements.
HDLC is defined as the default encapsulation on Cisco LAN interfaces.
* Cisco implemented a proprietary version of HDLC.

18 A two router network is running PPP over the serial interfaces that connect them. The enable password on the Denim router is "gateway".
The Denim router also has a locally configured authentication password for the Plaid router which is "fortress". Which command must be
executed on the Plaid router to allow Denim to authenticate to the Plaid router using CHAP?
Plaid(config)# enable secret gateway
Plaid(config)# enable secret fortress
Plaid(config)# username Plaid password fortress
* Plaid(config)# username Denim password fortress
Plaid(config)# hostname Plaid secret password gateway

Plaid(config)# hostname Plaid secret password fortress

19 ISDN BRI service uses two B channels to send data, voice, and video. If the first channel becomes saturated, the second channel can be
configured to forward packets. Which command will allow ISDN to load balance across both links?
Router(config-if)# ppp quality 2
Router(config-if)# ip variance
Router(config-if)# ip maximum-paths 2
* Router(config-if)# ppp multilink

20 When troubleshooting the Serial 0/0 interface of a router, a technician issues the show controllers command. The following was the output
of the command:
Interface is Serial0/0, electrical interface is UNKNOWN.
What can be concluded about the Serial 0/0 interface? (Choose three.)

* Serial0/0 is down, line protocol is down
Serial0/0 is down, line protocol is up
Serial0/0 is up, line protocol is down
The interface is neither DCE or DTE.
* The interface hardware may be faulty.
* The cabling may be improperly connected.

1 Which of the following are true of ISDN routers configured with dialer profiles? (Choose two.)
They do not use ACL to define interesting traffic.
* Their B channels can be configured with different subnets and encapsulation types.
* Their BRI interfaces can belong to multiple dialer pools.
They use PPP only.
They can only use the CHAP authentication protocol.

2 Which of the following describes the use of a SPID? (Choose two.)
selects the ISDN switch type
* identifies the line configuration of the BRI service
* allows multiple ISDN devices to share the local loop
designates whether a device is a TE1 or TE2
allows ISDN broadcasts

3 What is a reason why static routes are preferred over dynamic routes for DDR to operate on an ISDN interface?

An ISDN interface will not allow dynamic routing updates that use broadcast technology.
A dynamic route will take precedence over a static route because of its lower administrative distance.
Dynamic routing can never be considered interesting traffic by default.
Dialer-list configuration does not support dynamic routing.
* Dynamic routes may cause the ISDN connection to dial constantly to transmit updates.

4 What must be configured for an ISDN PRI connection? (Choose three.)
* ISDN switch type
Service Profile Identifier (SPID)
Dial-on-Demand Routing (DDR)
* PRI group time slot
* T1/E1 controller, framing type and line coding

5 You have just taken delivery of a new US standard Cisco 2620 router that includes a BRI "U" interface? Which of the following describes
how this router will be connected in the ISDN network?
An external terminal adapter (TA) must be attached to the router for connectivity.
An NT1 must be connected to the router for connectivity.
* The router is a TE1 device and is ready to connect to the provider's network.
The router is a TE2 device and requires both a TA and NT1 for connectivity.

6 A network administrator is troubleshooting an ISDN connectivity problem. Users are complaining they cannot connect to the Internet. The
network administrator suspects the ISDN connection attempt is timing out before a connection can be established. What command would the
network administrator use to determine what the "wait for carrier" timeout value is set to?
show isdn status
show isdn active
* show dialer
show interfaces bri0/0
debug isdn q931

show ISDN interfaces

7 Which command configures an ISDN interface to use a switch type which is different from that used on other interfaces on the router?
Router(config)#switch-type switch-type
Router(config-if)#switch-type switch-type
Router(config)#isdn switch-type switch-type
* Router(config-if)#isdn switch-type switch-type

8 Which of the following protocols can be used to encapsulate data traffic sent from a router BRI interface? (Choose two.)

Link Access Protocol - Data
* High-Level Data Link Control
Logical Link Control
Serial Data Link Control
* Point to Point protocol
Binary Synchronous Control protocol

9 A small company uses an ISDN WAN link to transfer e-mail to remote sites. What command would the administrator use to determine if
the ISDN link is up?
* show isdn status
show isdn active
show dialer
show interface bri0/0
debug isdn active

10 Why must routers be configured to specify the ISDN switch type?
* Switches use various implementations of Q.931.
The IOS of most routers lacks the ability to autosense the switch.
The switch must know what type of router it is communicating with.
The Layer 3 connection between the terminal equipment and the ISDN switch is not standardized.

11 Which of the following is considered out-of-band signaling?
using a frequency outside of the rated bandwidth for transmission
transmitting data over a control channel
* using a separate channel for control signals
transmitting control signals over a data channel

12 Which of the following is essential for all ISDN BRI interface configurations?
* ISDN switch type
line encoding technique
line framing method
local directory number
service profile identifier

13 Which router command would be used to enter the mode for configuring a T1 PRI connection?
* Router(config)# controller t1 {slot/port}
Router(config)# interface pri t1 {slot/port}
Router(config)# interface pri {slot/port} t1
Router(config)# controller {slot/port} t1

14 Which of the following correctly describes ISDN BRI? (Choose three.)
* two 64 kbps B channels and one 16 kbps D channel
* B channel is suitable for voice data
uses in-band signaling
* uses out-of-band signaling
offers the equivalent of a T1/E1 connection
twenty-three 64 kbps B channels and one 16 kbps D channel

15 The network administrator of XYZ company needs to configure a new ISDN router. After entering the commands shown in the graphic,
the administrator tries to access the Internet but the ISDN connection does not open. If the service provider verifies that the problem is with
XYZ's configuration, what is a possible cause of the problem?
The dialer map is configured incorrectly.
The encapsulation type is configured incorrectly.
* The dialer group is configured incorrectly.
The ACL is configured incorrectly.
The isdn switch-type command needs to be configured globally.

16 A network administrator is troubleshooting ISDN connectivity. The administrator suspects the problem lies with the authentication
protocol. What command should the administrator use to view the authentication process between the router and the ISDN switch?
debug pap authentication
debug chap authentication
* debug ppp authentication
debug isdn authentication

17 A network administrator in Europe has been asked to provide the network with an ISDN WAN link. The router available to provide the
WAN connection is a non-modular Cisco router with an S/T interface. What further equipment will be provided by the ISP for the ISDN
connection?
Nothing. The router is already suitable.
BRI WAN interface card to install in the router
* an external NT1 to terminate the local loop
a TA/NT1 device to install on the router

18 Which command is used within an existing ISDN network to display current call information, including the called number?
show isdn status
* show isdn active
show interfaces bri0/0
show ip interfaces

1 Why are SNMPv1 and SNMPv2c community strings considered a security risk?
SNMPv1 and SNMPv2c encapsulations are not encrypted by default.
* SNMPv1 and SNMPv2c community strings are sent as cleartext.
SNMPv1 and SNMPv2c are limited to 32-bit counters.
SNMPv1 and SNMPv2c uses a connectionless protocol.

2 Which statements are true regarding configuring SNMP? (Choose three.)
It is best to use the default read-only community strings in enterprise networks.
* It is not advisable to use the default read-write community string in an enterprise network.
* More than one read-only community string is supported.
* Authorized management stations can modify MIB objects with read-write access specified.
The maximum number of read-write strings supported is one.

3 Which of the following is a collection of software which includes a GUI interface to allow the network administrator to monitor and
manage the network?
* network management application
network management agent
management information base
network management protocol

4 Which of the following does SNMP use to hold information collected about the network?
network management station
network management database
* management information base
database information agent

5 Which type of information does SNMP collect about a router? (Choose three.)
routing table entries
* number of certain types of error messages received
* number of bytes in and out of a device
* status of network interfaces going up and down
number of protocols running on workstations

6 Which operating systems support multiuser capability? (Choose three.)
* Linux
Windows 98
Windows ME
* Windows XP
* Windows 2000

7 Which means of communication does an SNMP network agent use to provide a network management station with important but
unsolicited information?
query
broadcast
ICMP ping
* trap
poll

8 How does RMON gather statistics on a segment?
analyzes traps on the segment
polls packets on the segment
* analyzes every frame on the segment
analyzes source and destination addresses

9 Which of the following are examples of network management applications? (Choose two.)
Windows 2000 Professional
* Ciscoworks2000
* HP Openview
Red Hat Linux
Cisco ConfigMaker

10 In the above illustration, which configuration commands can be used to specify the location of a managed device and the main system
contacts for the device? (Choose two.)
SanJose(config-if)# snmp-server SanJose
* Atlanta(config)# snmp-server contact JPSmith
Atlanta(config)# snmp contact JPSmith
* SanJose(config)# snmp-server location SanJose
Chicago#(config)# snmp chicago

11 For which platform was UNIX first marketed commercially?
workstations and servers
workstations
* network servers
large mainframe systems

12 How does SNMPv3 address the security shortcomings of SNMPv1 and SNMPv2c?
improved SMI features
support for centralized and distributed management
* secure access to MIBs
control of heterogeneous networks

13 Which statements describe the Windows 2000 operating system family? (Choose three.)
* .NET Server was designed to run enterprise level web and FTP services.
Active Directory services run on both Windows 2000 Professional and Windows 2000 Server.
* The entire family of Windows 2000 operating systems can operate as a file, print, FTP or web server.
Both Windows 2000 Professional and Server can support up to 256 simultaneous dialup sessions.
* .NET server was designed to compete with Linux and Unix.

14 An SNMPv1 agent would issue a GetResponse message to reply to which NMS requests? (Choose three.)
* GetRequest
GetBulkRequest
* GetNextRequest
* SetRequest
GetNextbulkRequest

15 Which of the following describes the community strings used for SNMPv1 and SNMPv2c? (Choose two.)
* The community strings are sent using UDP.
The read only string on most devices is set to private.
The read/write string on most devices is set to public.
Only the NMA needs to be configured with the community strings.
* The community strings are sent across the network in cleartext.

16 Which features are supported by the Mac OS X system that make it a competitive choice for operating systems? (Choose four.)
* protected memory
sixty-two bit addressing
* preemptive multitasking
open source operating system code
* symmetric multiprocessing
* Appletalk-to-Windows network connectivity

17 Which command would enable logging on all supported destinations?
Router(config)# logging 131.152.0.0
Router(config)# logging routerA
* Router(config)# logging on
Router(config)# logging enable

4 Which of the following does SNMP use to hold information collected about the network?
network management station
network management database
* management information base
database information agent

6 Which operating systems support multiuser capability? (Choose three.)
* Linux
Windows 98
Windows ME
* Windows XP
* Windows 2000

7 Which means of communication does an SNMP network agent use to provide a network management station with important but
unsolicited information?
query
broadcast
ICMP ping
* trap
poll

8 How does RMON gather statistics on a segment?
analyzes traps on the segment
polls packets on the segment
* analyzes every frame on the segment
analyzes source and destination addresses

9 Which of the following are examples of network management applications? (Choose two.)
Windows 2000 Professional
* Ciscoworks2000
* HP Openview
Red Hat Linux
Cisco ConfigMaker

11 For which platform was UNIX first marketed commercially?
workstations and servers
workstations
* network servers
large mainframe systems

14 An SNMPv1 agent would issue a GetResponse message to reply to which NMS requests? (Choose three.)
* GetRequest
GetBulkRequest
* GetNextRequest
* SetRequest
GetNextbulkRequest

17 Which command would enable logging on all supported destinations?
Router(config)# logging 131.152.0.0
Router(config)# logging routerA
* Router(config)# logging on
Router(config)# logging enable

1. Which of the following describes the roles of devices in a WAN?
A CSU/DSU terminates a digital local loop.
A modem terminates an analog local loop.
A router is commonly considered a DTE device.

2. What value in the address field of a Frame Relay header identifies the destination of the frame?
DLCI

3. The serial PPP link between the Left and Right routers is configured as shown in the diagram. Which configuration issue explains why the
link is unable to establish a PPP session?
The usernames are misconfigured.

4. The output of the show interfaces serial 0/0 command for a frame-relay connection indicates that the serial line is up but the line protocol
is down. What are possible causes for this? (Choose two.) (2 / 5)
There is an LMI-type mismatch between the Frame Relay switch and the router.
The cable is disconnected.

5. Which statements are correct about the point in the network where the responsibility of the service provider ends?
The International point is on the customer side of the network terminating unit(NTU).
The United States point is at the interface of the customer-provided equipment and the local loop.
The point is called the demarcation point.

6. While prototyping an internetwork in the corporate lab, a network administrator is testing a serial link between serial 0/0 interfaces on two
routers. The labels on the serial cable ends have been damaged and are unreadable. What command can be issued to determine which router
is connected to the DCE cable end?
show controllers serial 0/0

7. A network technician determines DHCP clients are not working properly. The clients are receiving IP configuration information from a
DHCP server configured on the router but cannot access the Internet. From the output in the graphic, what is the most likely problem?
The DHCP pool is not bound to the interface.

8. A technician enters the interface serial 0/0.1 multipoint command when configuring a router. What effect will the multipoint keyword have
in this configuration?
Split-horizon issues will need to be resolved for this network if RIP is the routing protocol.
All the participating interfaces of remote routers will be configured in the same subnet.

9. When configuring a Frame Relay connection, when should a static Frame Relay map be used?
when the remote router does not support Inverse ARP
when broadcast traffic and multicast traffic over the PVC must be controlled

10. Which router command would be used to associate a Layer 2 address with the corresponding Layer 3 address in the internetwork in the
diagram?
RouterA(config-if)#frame-relay map ip 192.168.15.2 100 broadcast

11. Which of the following ISDN protocols is responsible for call setup and call teardown?
ITU-T Q.921

12. What are two ways to resolve split-horizon issues in a Frame Relay network? (Choose two.) (2 / 5)
create a full-mesh topology
use point-to-point subinterfaces

13. What is the purpose of the command marked with an arrow shown in the partial configuration output of a Cisco 806 broadband router?
defines which addresses are allowed into the router

14. A system administrator is unable to ping the Serial0/0 interface of RouterB from RouterA. During the troubleshooting process, the
following facts are established: (0 / 5)
- IP addressing and subnet masks are correct.
- RouterA is a Cisco router and RouterB is a router from another vendor.
- RouterA is configured with the default encapsulation.
- The serial interfaces on both routers are up.
- The protocol is down on the serial interfaces of both routers.

15. What should the administrator do to solve the problem?
Change the encapsulation on both routers to PPP.

16. An ISDN circuit from a branch office is remaining connected to the regional office. A network administrator determines a user has
initiated a continuous ping from a desktop computer to the regional office. Which configuration change would allow the ISDN circuit to
disconnect during any attempts to ping, while otherwise functioning properly?
change the dialer list to exclude ICMP as interesting

17. - call is made (1 / 6)
3,2,1,4

18. Which protocol should be chosen to support WAN connectivity in a multi-vendor system and provide strong security through
authentication?
PPP with CHAP

19. Which of the following are valid steps for a basic ISDN BRI configuration?
set the SPIDs if required by the ISDN switch