Question

In a TCP segment, the destination port number tells _____________. A. which computer sent the TCP segment. B. which application layer process the packet is from C. the IP address of the source computer D. the IP address of the destination computer E. which application layer process that the packet should be sent to at the destination

Answer 1

Look first we should know about TCP segment , so a TCP segment is nothing but a packet in the TCP.

in its format there are two port numbers One is the Source port number(of 16 bits) and other is Destination Port Number(also of 16 bits.)

Now Source port number ,identify the port number of the application program that is sending the TCP segment, that means source IP address.

And Destination Port number , is used to identify the Port number of the application program that is reciving the TCP segment, that means Destination IP address.

Now looking on the options one by one :

As from the above defination of the Destination port number, it is clear that it does not tell about

1. A. which computer sent the TCP segment,
2. B. and also not about that which application layer process the packet is from
3. C. and also not the IP address of the source computer, as it was identify by source Port number.
4. E. which application layer process that the packet should be sent to at the destination.

So all the above option A,B,C,E are incorrect and the Correct answer is D , that as Destination Port number , is used to identify the Port number of the application program that is reciving the TCP segment, that means Destination IP address.

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