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 B?

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

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

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

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

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

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 B is port 6135.

2. The destination port for packet B is port 6057.

3. The source port for packet A is port 6057.

4. The destination port for packet A is port 6135.

5. The source port for packet C is port 6505.

6. The destination port for packet C is port 6135.

7. The source port for packet D is port 6216.

8. The destination port for packet D is port 6135.



That's incorrect

That's correct

The answer was: 6135

Question 1 of 8

The answer was: 6057

Question 2 of 8

The answer was: 6057

Question 3 of 8

The answer was: 6135

Question 4 of 8

The answer was: 6505

Question 5 of 8

The answer was: 6135

Question 6 of 8

The answer was: 6216

Question 7 of 8

The answer was: 6135

Question 8 of 8

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We greatly appreciate the work of John Broderick (UMass '21) in helping to develop these interactive problems.

Copyright © 2010-2025 J.F. Kurose, K.W. Ross
Comments welcome and appreciated: kurose@cs.umass.edu