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 C?

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

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

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

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 B?

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




Solution


1. The source port for packet C is port 7090.

2. The destination port for packet C is port 5100.

3. The source port for packet D is port 5100.

4. The destination port for packet D is port 7090.

5. The source port for packet A is port 5020.

6. The destination port for packet A is port 5100.

7. The source port for packet B is port 5100.

8. The destination port for packet B is port 5020.



That's incorrect

That's correct

The answer was: 7090

Question 1 of 8

The answer was: 5100

Question 2 of 8

The answer was: 5100

Question 3 of 8

The answer was: 7090

Question 4 of 8

The answer was: 5020

Question 5 of 8

The answer was: 5100

Question 6 of 8

The answer was: 5100

Question 7 of 8

The answer was: 5020

Question 8 of 8

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