Multiple choose Suppose client PC named X initiates a telnet session to a server
ID: 3695862 • Letter: M
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.