version A: 1 Which attribute is used by a bridge to make forwarding decisions? source IP address source MAC address destination IP address ** destination MAC address Layer 4-7 protocol address 2 What is the effect of adding additional hosts to a half-duplex Ethernet network? (Choose three.) ** collisions increase collisions decrease ** jam signals increase jam signals decrease throughput decreases ** throughput increases 3 How does an Ethernet bridge handle an incoming frame? (Choose three.) The source MAC address and input interface pair are added to the bridging table. ** The destination MAC address and input interface pair are added to the bridging table. If no match to the destination MAC address is found in the bridging table, the frame is discarded. ** If no match to the destination MAC address is found in the bridging table, the frame is flooded out all other interfaces. ** If a match to the destination MAC address is found in the bridging table, the frame is forwarded out the associated interface. If a match to the source MAC address is found in the bridging table, the frame is forwarded to all ports. 4 Which of the following is used to build a switching table? source IP addresses destination IP addresses destination MAC addresses ** source MAC addresses 5 After a collision occurs on a half-duplex Ethernet network, how does a transmitting host proceed? (Choose two.) It does not stop transmitting. ** It listens to determine if the network is in use before attempting to retransmit. It resumes transmitting while the jam signal clears the wire. ** It resumes transmitting based on the NIC back-off algorithm. It will take priority and be the first host to transmit after the collision. 6 Which statements describe asymmetric switching? (Choose three.) It uses data compression algorithms to manage higher bandwidth interfaces. ** It is often used to provide high bandwidth uplinks for a number of lower bandwidth client interfaces. ** It provides connections between network segments that operate at different bandwidths. It uses cut-through forwarding when going from a lower bandwidth to a higher bandwidth interface. It is used to provide more bandwidth to network clients than to backbone or server links. ** It may require buffering frames before forwarding to the destination interface. 7 Which statements are true concerning the shared memory buffering used by an Ethernet switch? (Choose two.) ** Frames are processed through a single queue. ** All frames are placed in a common memory buffer. Frames are placed in a queue for the destination port. A port with a full memory buffer can cause frames for available ports to be delayed. Each switch port is statically assigned a buffer of equal size. 8 ** Which statements are true regarding hubs? (Choose three.) Hubs operate at Layer 1 of the OSI model. ** They create separate collision domains. Signals are distributed through all ports. Layer 2 addresses are used to make decisions. They calculate the CRC for each frame received prior to forwarding. ** Bandwidth is shared among all connected users. 9 What are the functions of routers? (Choose three.) improving network performance by increasing latency by twenty to thirty percent ** segmenting broadcast domains ** forwarding packets based on destination network layer addresses ** segmenting collision domains forwarding packets as soon as the destination MAC address is read developing routing table entries based on source IP addresses 10 Which of the following devices use physical addresses to make forwarding decisions? (Choose two.) hub ** bridge router ** switch concentrator multi-port repeater 11 Which form of buffering is used by bridges? cut-through fragment-free fast-forward ** store-and-forward 12 Switching may be implemented to improve the performance of which of the following networking technologies? (Choose three.) ** Ethernet 10BASE-T Ethernet 10BASE2 ** FDDI ** Token Ring EIA-232 13 Hubs are concerned with which PDU? ** bits frames packets datagrams 14 What does switch latency describe? forwarding method used by a switch time it takes for a frame to be received by a switch ** improvement in network performance from using a switch time delay between when a frame enters and exits a switch increase in the size of a collision domain from using a switch 15 Where are switching tables stored in a Cisco LAN switch? ROM ** CAM Flash SIMM NRAM 16 Which switching mode changes to store-and-forward mode after it detects a given number of errors? cut-through adaptive fast-forward fragment-free ** adaptive cut-through 17 Which of the following is a Layer 2 broadcast address? 0.0.0.0 255.255.255.255 11:11:11:11 FF:FF:FF:FF ** FF:FF:FF:FF:FF:FF 18 Refer to the graphic. Which point in the frame must be reached before it is forwarded by a switch that is using fast-forward mode? A B ** C D E F 19 Why does a switch have higher throughput compared to a bridge? Switching occurs in software. ** Switching occurs in hardware. Switches create virtual circuits. Switches segment LANs. 20 What is the potential throughput of a 10 Mbps Ethernet connection operating in full-duplex mode? (Choose two.) 10 Mbps total ** 20 Mbps total 5 Mbps TX and 5 Mbps RX ** 10 Mbps TX and 10 Mbps RX 40 to 60 percent on TX and RX 21 An Ethernet switch has developed the MAC address table shown at the top of the graphic. What action will the switch take when it receives the frame shown at the bottom of the graphic? forward the frame out all interfaces forward the frame out all interfaces except Interface3 discard the frame ** forward the frame out Interface1 forward the frame out Interface2 forward the frame out Interface3 22 Which of the following are true regarding the addition of switches to a network? (Choose two.) ** They increase the number of collision domains. They decrease the number of collision domains. They increase the number of broadcast domains. They decrease the number of broadcast domains. ** They increase the amount of bandwidth available to users. They decrease the amount of bandwidth available to users. 23 What is designed to prevent multiple devices on an Ethernet network from transmitting at the same time? synchronization clock ** CSMA/CD access method token access method shared medium 24 Refer to the graphic. Which point must be reached before a frame is forwarded when the switch is using store-and-forward mode? A B C D E ** F ############################## ############################## ############################## ############################## version B: 1 After a collision occurs on a half-duplex Ethernet network, how does a transmitting host proceed? (Choose two.) It does not stop transmitting. It listens to determine if the network is in use before attempting to retransmit. XXX It resumes transmitting while the jam signal clears the wire. It resumes transmitting based on the NIC back-off algorithm. XXX It will take priority and be the first host to transmit after the collision. 2 What is the effect of adding additional hosts to a half-duplex Ethernet network? (Choose three.) collisions increase XXX collisions decrease jam signals increase XXX jam signals decrease throughput decreases xxxx throughput increases 3 Which switching mode changes to store-and-forward mode after it detects a given number of errors? cut-through adaptive fast-forward fragment-free adaptive cut-through XXX 4 What is the potential throughput of a 10 Mbps Ethernet connection operating in full-duplex mode? (Choose two.) 10 Mbps total 20 Mbps total XXX 5 Mbps TX and 5 Mbps RX 10 Mbps TX and 10 Mbps RX XXX 40 to 60 percent on TX and RX 5 Which statements are true regarding hubs? (Choose three.) Hubs operate at Layer 1 of the OSI model. XXX They create separate collision domains. Signals are distributed through all ports. XXX Layer 2 addresses are used to make decisions. They calculate the CRC for each frame received prior to forwarding. Bandwidth is shared among all connected users. xxx 6 Which statements describe asymmetric switching? (Choose three.) It uses data compression algorithms to manage higher bandwidth interfaces. It is often used to provide high bandwidth uplinks for a number of lower bandwidth client interfaces. xxx It provides connections between network segments that operate at different bandwidths. XXX It uses cut-through forwarding when going from a lower bandwidth to a higher bandwidth interface. It is used to provide more bandwidth to network clients than to backbone or server links. It may require buffering frames before forwarding to the destination interface. XXX 7 Which of the following is used to build a switching table? source IP addresses destination IP addresses destination MAC addresses XXX source MAC addresses 8 Which of the following is a Layer 2 broadcast address? 0.0.0.0 255.255.255.255 11:11:11:11 FF:FF:FF:FF FF:FF:FF:FF:FF:FF XXX 9 Which attribute is used by a bridge to make forwarding decisions? source IP address source MAC address destination IP address destination MAC address XXX Layer 4-7 protocol address 10 Where are switching tables stored in a Cisco LAN switch? ROM CAM XXX Flash SIMM NRAM 11 Why does a switch have higher throughput compared to a bridge? Switching occurs in software. Switching occurs in hardware. Switches create virtual circuits. XXX Switches segment LANs. 12 Which statements are true concerning the shared memory buffering used by an Ethernet switch? (Choose two.) Frames are processed through a single queue. All frames are placed in a common memory buffer. XXX Frames are placed in a queue for the destination port. A port with a full memory buffer can cause frames for available ports to be delayed. XXX Each switch port is statically assigned a buffer of equal size. 13 Refer to the graphic. Which point in the frame must be reached before it is forwarded by a switch that is using fast-forward mode? A B C XXX D E F 14 What does switch latency describe? forwarding method used by a switch time it takes for a frame to be received by a switch improvement in network performance from using a switch time delay between when a frame enters and exits a switch XXX increase in the size of a collision domain from using a switch 15 Which of the following devices use physical addresses to make forwarding decisions? (Choose two.) hub bridge XXX router switch XXX concentrator multi-port repeater 16 What is designed to prevent multiple devices on an Ethernet network from transmitting at the same time? synchronization clock CSMA/CD access method XXX token access method shared medium 17 Which form of buffering is used by bridges? cut-through fragment-free fast-forward store-and-forward XXX 18 How does an Ethernet bridge handle an incoming frame? (Choose three.) The source MAC address and input interface pair are added to the bridging table. The destination MAC address and input interface pair are added to the bridging table. XXX If no match to the destination MAC address is found in the bridging table, the frame is discarded. If no match to the destination MAC address is found in the bridging table, the frame is flooded out all other interfaces. XXX If a match to the destination MAC address is found in the bridging table, the frame is forwarded out the associated interface. XXX If a match to the source MAC address is found in the bridging table, the frame is forwarded to all ports. 19 Hubs are concerned with which PDU? bits XXX frames packets datagrams 20 Which of the following are true regarding the addition of switches to a network? (Choose two.) They increase the number of collision domains. XXX They decrease the number of collision domains. They increase the number of broadcast domains. They decrease the number of broadcast domains. They increase the amount of bandwidth available to users. XXX They decrease the amount of bandwidth available to users. 21 An Ethernet switch has developed the MAC address table shown at the top of the graphic. What action will the switch take when it receives the frame shown at the bottom of the graphic? forward the frame out all interfaces forward the frame out all interfaces except Interface3 discard the frame forward the frame out Interface1 XXX forward the frame out Interface2 forward the frame out Interface3 22 Refer to the graphic. Which point must be reached before a frame is forwarded when the switch is using store-and-forward mode? A B C D E F XXX 23 Switching may be implemented to improve the performance of which of the following networking technologies? (Choose three.) Ethernet 10BASE-T XXX Ethernet 10BASE2 FDDI XXX Token Ring XXX EIA-232 24 What are the functions of routers? (Choose three.) improving network performance by increasing latency by twenty to thirty percent segmenting broadcast domains XXX forwarding packets based on destination network layer addresses XXX segmenting collision domains XXX forwarding packets as soon as the destination MAC address is read developing routing table entries based on source IP addresses