ch4, Sieci Komputerowe Cisco



Początek formularza


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Based on the transport layer header shown in the diagram, which of the following statements describe the established

session? (Choose two.)

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This is a UDP header.

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This contains a Telnet request.

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This contains a TFTP data transfer.

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The return packet from this remote host will have an Acknowledgement Number of 43693.

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This is a TCP header.

Dół formularza

Option 2 and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required.

Scoring Rule For:  correctness of response

Max Value = 2

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Początek formularza

Dół formularza

2 points for Option 3
0 points for any other option

Początek formularza

Why are port numbers included in the TCP header of a segment?

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to indicate the correct router interface that should be used to forward a segment

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to identify which switch ports should receive or forward the segment

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to determine which Layer 3 protocol should be used to encapsulate the data

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to enable a receiving host to forward the data to the appropriate application

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to allow the receiving host to assemble the packet in the proper order

Dół formularza

Scoring Rule For:  correctness of response

Max Value = 2

Scoring Rule For:  correctness of response

2 points for Option 4
0 points for any other option

Max Value = 2

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Początek formularza

Which OSI model layer is responsible for regulating the flow of information from source to destination,

reliably and accurately?

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application

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presentation

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session

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transport

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network

Dół formularza

2 points for Option 4
0 points for any other option

Scoring Rule For:  correctness of response

Max Value = 2


Początek formularza


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Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process,

Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data.

What action will Server 1 take as a result?

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create a Layer 1 jam signal

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reach a timeout and resend the data that needs to be acknowledged

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send a RESET bit to the host

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change the window size in the Layer 4 header

Dół formularza

2 points for Option 2
0 points for any other option

Początek formularza

Why is flow control used for TCP data transfer?

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to synchronize equipment speed for sent data

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to synchronize and order sequence numbers so data is sent in complete numerical order

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to prevent the receiver from being overwhelmed by incoming data

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to synchronize window size on the server

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to simplify data transfer to multiple hosts

Dół formularza

Scoring Rule For:  correctness of response

Max Value = 2

Scoring Rule For:  correctness of response

2 points for Option 3
0 points for any other option

Max Value = 2

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Początek formularza

Which two options represent Layer 4 addressing? (Choose two.)

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identifies the destination network

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identifies source and destination hosts

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identifies the communicating applications

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identifies multiple conversations between the hosts

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identifies the devices communicating over the local media

Dół formularza

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Początek formularza

Dół formularza

Option 3 and Option 4 are correct.
1 point for each correct option.
0 points if more options are selected than required.

Scoring Rule For:  correctness of response

Max Value = 2


Początek formularza


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Refer to the exhibit. In line 7 of this Wireshark capture, what TCP operation is being performed?

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session establishment

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segment retransmit

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data transfer

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session disconnect

Dół formularza

2 points for Option 1
0 points for any other option

Scoring Rule For:  correctness of response

Max Value = 2


Początek formularza


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Refer to the exhibit. What two pieces of information can be determined from the output that is shown?

(Choose two.)

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The local host is using well-known port numbers to identify the source ports.

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A termination request has been sent to 192.135.250.10.

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Communication with 64.100.173.42 is using HTTP Secure.

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The local computer is accepting HTTP requests.

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192.168.1.101:1042 is performing the three-way handshake with 128.107.229.50:80.

Dół formularza

Option 2 and Option 3 are correct.
1 point for each correct option.
0 points if more options are selected than required.

Scoring Rule For:  correctness of response

Max Value = 2


Początek formularza

What is dynamically selected by the source host when forwarding data?

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destination logical address

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source physical address

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default gateway address

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source port

Dół formularza

Scoring Rule For:  correctness of response

2 points for Option 4
0 points for any other option

Max Value = 2

Początek formularza

What are two features of the User Datagram Protocol (UDP)? (Choose two.)

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flow control

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low overhead

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connectionless

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connection-oriented

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sequence and acknowledgements

Dół formularza

Option 2 and Option 3 are correct.
1 point for each correct option.
0 points if more options are selected than required.

Scoring Rule For:  correctness of response

Max Value = 2


Początek formularza

What mechanism is used by TCP to provide flow control as segments travel from source to destination?

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sequence numbers

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session establishment

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window size

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acknowledgments

Dół formularza

2 points for Option 3
0 points for any other option

Scoring Rule For:  correctness of response

Max Value = 2


Początek formularza

Which transport layer protocol provides low overhead and would be used for applications

which do not require reliable data delivery?

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TCP

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IP

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UDP

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HTTP

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DNS

Dół formularza

2 points for Option 3
0 points for any other option

Scoring Rule For:  correctness of response

Max Value = 2


Początek formularza

Which information is found in both the TCP and UDP header information?

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sequencing

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flow control

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acknowledgments

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source and destination

Dół formularza

2 points for Option 4
0 points for any other option

Scoring Rule For:  correctness of response

Max Value = 2


Początek formularza

Which three features allow TCP to reliably and accurately track the transmission of data from source

to destination?

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encapsulation

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flow control

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connectionless services

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session establishment

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numbering and sequencing

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best effort delivery

Dół formularza

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Początek formularza

Dół formularza

Option 2, Option 4, and Option 5 are correct.
1 point for each correct option.
0 points if more options are selected than required.

Początek formularza

During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?

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The packets will not be delivered.

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The packets will be retransmitted from the source.

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The packets will be delivered and reassembled at the destination.

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The packets will be delivered and not reassembled at the destination.

Dół formularza

Scoring Rule For:  correctness of response

Max Value = 3

Scoring Rule For:  correctness of response

2 points for Option 3
0 points for any other option

Max Value = 2

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Początek formularza

Which is an important characteristic of UDP?

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acknowledgement of data delivery

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minimal delays in data delivery

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high reliability of data delivery

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same order data delivery

Dół formularza

2 points for Option 2
0 points for any other option

Scoring Rule For:  correctness of response

Max Value = 2


Początek formularza

After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?

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13

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53

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80

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1024

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1728

Dół formularza

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Początek formularza

Dół formularza

Scoring Rule For:  correctness of response

2 points for Option 3
0 points for any other option

Max Value = 2

Początek formularza

Which event occurs during the transport layer three-way handshake?

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The two applications exchange data.

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TCP initializes the sequence numbers for the sessions.

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UDP establishes the maximum number of bytes to be sent.

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The server acknowledges the bytes of data received from the client.

Dół formularza

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Scoring Rule For:  correctness of response

2 points for Option 2
0 points for any other option

Max Value = 2

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