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 7145.
2. The destination port for packet B is port 7177.
3. The source port for packet A is port 7177.
4. The destination port for packet A is port 7145.
5. The source port for packet C is port 5685.
6. The destination port for packet C is port 7145.
7. The source port for packet D is port 6351.
8. The destination port for packet D is port 7145.
That's incorrect
That's correct
The answer was: 7145
The answer was: 7177
The answer was: 7177
The answer was: 7145
The answer was: 5685
The answer was: 7145
The answer was: 6351
The answer was: 7145