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 A?

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

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

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




Solution


1. The source port for packet D is port 6820.

2. The destination port for packet D is port 6203.

3. The source port for packet B is port 6820.

4. The destination port for packet B is port 6203.

5. The source port for packet A is port 6203.

6. The destination port for packet A is port 6820.

7. The source port for packet C is port 6203.

8. The destination port for packet C is port 6820.



That's incorrect

That's correct

The answer was: 6820

Question 1 of 8

The answer was: 6203

Question 2 of 8

The answer was: 6820

Question 3 of 8

The answer was: 6203

Question 4 of 8

The answer was: 6203

Question 5 of 8

The answer was: 6820

Question 6 of 8

The answer was: 6203

Question 7 of 8

The answer was: 6820

Question 8 of 8

Try Another Problem

We gratefully acknowledge the programming and problem design work of John Broderick (UMass '21), which has really helped to substantially improve this site.

Copyright © 2010-2022 J.F. Kurose, K.W. Ross
Comments welcome and appreciated: kurose@cs.umass.edu