Hosts A and B communicate over a TCP connection. Host B has already received fro

Question

Hosts A and B communicate over a TCP connection. Host B has already received from A all bytes up to and including byte 126. Host A then sends two segments to Host B back to back. The first and second segments contain 70 and 50 bytes of data respectively. In the first segment, the sequence number is 127. Host B sends an acknowledgment back to A whenever it receives a segment from Host A.

If the second segment arrives before the first segment, what acknowledgement number does B send back to A, and why?

Explanation / Answer

It will send the acknowledgement number 127.

Calculating the number of sending acknowledgement number is like this. This is all for our understanding purpose.

Whenever it is receiving for the first time it will send 1 because the first pakcet in the stream carries pay load.and no data has been transmitted since the last packet in the stream.

The packets pay load is 126 and also the sequence number is 127. So it will send 127.

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