Interactive end-of-chapter exercises


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 C?

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

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

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

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

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

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

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




Solution


1. The source port for packet C is port 6568.

2. The destination port for packet C is port 5456.

3. The source port for packet B is port 5456.

4. The destination port for packet B is port 5022.

5. The source port for packet A is port 5022.

6. The destination port for packet A is port 5456.

7. The source port for packet D is port 6768.

8. The destination port for packet D is port 5456.



That's incorrect

That's correct

The answer was: 6568

Question 1 of 8

The answer was: 5456

Question 2 of 8

The answer was: 5456

Question 3 of 8

The answer was: 5022

Question 4 of 8

The answer was: 5022

Question 5 of 8

The answer was: 5456

Question 6 of 8

The answer was: 6768

Question 7 of 8

The answer was: 5456

Question 8 of 8

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