Interactive end-of-chapter exercises


Supplement to Computer Networking: A Top Down Approach 8th Edition


"Tell me and I forget. Show me and I remember. Involve me and I understand." Chinese proverb

Textbook Cover

TCP Multiplexing and Demultiplexing

In the scenario below, the left and right TCP clients communicate with a TCP server using TCP sockets. The Python code used to create a single welcoming socket in the server is shown in the figure (the welcoming socket itself is not shown graphically); code is also shown for the client sockets as well. The three sockets shown in server were created as a result of the server accepting connection requests on this welcoming socket from the two clients (one connection from the client on the left, and two connections from the client on the right).



Question List


1. What is the source port # for packet D?

2. What is the destination port # for packet D?

3. What is the source port # for packet C?

4. What is the destination port # for packet C?

5. What is the source port # for packet B?

6. What is the destination port # for packet B?

7. What is the source port # for packet A?

8. What is the destination port # for packet A?




Solution


1. The source port for packet D is port 6357.

2. The destination port for packet D is port 5892.

3. The source port for packet C is port 5023.

4. The destination port for packet C is port 5892.

5. The source port for packet B is port 5892.

6. The destination port for packet B is port 5550.

7. The source port for packet A is port 5550.

8. The destination port for packet A is port 5892.



That's incorrect

That's correct

The answer was: 6357

Question 1 of 8

The answer was: 5892

Question 2 of 8

The answer was: 5023

Question 3 of 8

The answer was: 5892

Question 4 of 8

The answer was: 5892

Question 5 of 8

The answer was: 5550

Question 6 of 8

The answer was: 5550

Question 7 of 8

The answer was: 5892

Question 8 of 8

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