Interactive end-of-chapter exercises

UDP Multiplexing and Demultiplexing

In the scenario below, the left and right clients communicate with a server using UDP sockets. The same socket at the server is used to communicate with both clients. The Python code used to create the sockets is shown in the figure. Consider the four transport-layer packets – A, B, C and D – shown in the figure below.



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 B?

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

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 A?

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



Solution


1. The source port for packet D is port 7281.

2. The destination port for packet D is port 7237.

3. The source port for packet B is port 7281.

4. The destination port for packet B is port 7237.

5. The source port for packet C is port 7237.

6. The destination port for packet C is port 7281.

7. The source port for packet A is port 7237.

8. The destination port for packet A is port 7281.


That's incorrect

That's correct

The answer was: 7281

Question 1 of 8

The answer was: 7237

Question 2 of 8

The answer was: 7281

Question 3 of 8

The answer was: 7237

Question 4 of 8

The answer was: 7237

Question 5 of 8

The answer was: 7281

Question 6 of 8

The answer was: 7237

Question 7 of 8

The answer was: 7281

Question 8 of 8

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