Multiple choose Suppose client PC named X initiates a telnet session to a server

Question

Multiple choose

Suppose client PC named X initiates a telnet session to a server called S. At the same time a laptop client named Y initiates a telnet session to server S also. Provide possible source and destination port numbers for:

A- The segments sent from X to S

B- The segments sent from Y to S

C- The segments sent from S to X

D- The segments sent from S to Y

E- If X and Y are different hosts is it possible for them to both use the same source port number?

F- If X and Y are the same host, is it possible for them to both user the same source port number?

Explanation / Answer

A-

The ports source and destination are just be any number.

The number for ports used here are only examples.

The important points are as follows:

The source port number for the segments send by the client A to the server S may be 467 and the number for the destination is 23 (Telnet).

B-

The source port number of the segments send by the client Y to the server S may be 513 and the destination port is 23 (Telnet).

C-

The source port number of the segments send by the server S to the client X may be 23 (Telnet) and the destination port is 467.

D-

The source port number of the segments send by the server S to the client Y may be 23 and the destination port is 513.

E-

Yes, if the clients have the different hosts X and Y can use the same source port number.

To find the correct host, the IP addresses are with the segments.

F-

No, if they are the same hosts, this is not possible for both to use same port number.

Since, the server uses the IP addresses to differentiate the hosts.

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