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 6840.

2. The destination port for packet B is port 6993.

3. The source port for packet A is port 6993.

4. The destination port for packet A is port 6840.

5. The source port for packet C is port 5768.

6. The destination port for packet C is port 6840.

7. The source port for packet D is port 7406.

8. The destination port for packet D is port 6840.



That's incorrect

That's correct

The answer was: 6840

Question 1 of 8

The answer was: 6993

Question 2 of 8

The answer was: 6993

Question 3 of 8

The answer was: 6840

Question 4 of 8

The answer was: 5768

Question 5 of 8

The answer was: 6840

Question 6 of 8

The answer was: 7406

Question 7 of 8

The answer was: 6840

Question 8 of 8

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