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 B?

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

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 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 B is port 7338.

2. The destination port for packet B is port 6516.

3. The source port for packet D is port 7338.

4. The destination port for packet D is port 6516.

5. The source port for packet C is port 6516.

6. The destination port for packet C is port 7338.

7. The source port for packet A is port 6516.

8. The destination port for packet A is port 7338.


That's incorrect

That's correct

The answer was: 7338

Question 1 of 8

The answer was: 6516

Question 2 of 8

The answer was: 7338

Question 3 of 8

The answer was: 6516

Question 4 of 8

The answer was: 6516

Question 5 of 8

The answer was: 7338

Question 6 of 8

The answer was: 6516

Question 7 of 8

The answer was: 7338

Question 8 of 8

Try Another Problem

We’d appreciate your leave us feedback on this networking tutor.

★ ★ ★ ★ ★

We gratefully acknowledge the programming and problem design work of John Broderick (UMass '21), which has really helped to substantially improve this site. The networking tutor was designed and implemented by Hashim Zia and Shayan Ahmad from New York University Abu Dhabi.

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