Host A and B are communicating over a TCP connection, and Host B has already received from A all bytes up to byte 126. Suppose Host A then sends two segments to Host B back-to-back. The ? rst and second segments contain 80 and 40 bytes of data, respectively. In the? rst segment, the sequence number is 127, the source port number is 3024, and the destination port number is 80. Host B sends an acknowledgement whenever it receives a segment from Host A.
a. In the second segment sent from Host A to B, what are the sequence number, source port number, and destination port number?
b. ) If the? rst segment arrives before the second segment, in the acknowledgement of the? rst arriving segment, what is the acknowledgement number, the source port number, and the destination port number?
c. If the second segment arrives before the? rst segment, in the acknowledgement of the? rst arriving segment, what is the acknowledgement number?
d. Suppose the two segments sent by A arrive in order at B. B sends acknowledgements for both segments, but the? rst acknowledgement is lost and the second acknowledgement arrives after the? rst timeout interval. Draw a timing diagram showing these segments and all other segments and acknowledgements sent.
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