Host A and B are communicating over a TCP connection, and Host B has already received from A all bytes up to byte 126

| April 14, 2018


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 first and second segments contain 80 and 40 bytes of data, respectively. In the first 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. (4 marks) In the second segment sent from Host A to B, what are the sequence number, source port number, and destination port number? b. (4 marks) If the first segment arrives before the second segment, in the acknowledgement of the first arriving segment, what is the acknowledgement number, the source port number, and the destination port number? c. (4 marks) If the second segment arrives before the first segment, in the acknowledgement of the first arriving segment, what is the acknowledgement number? d. (8 marks) Suppose the two segments sent by A arrive in order at B. B sends acknowledgements for both segments, but the first acknowledgement is lost and the second acknowledgement arrives after the first timeout interval. Draw a timing diagram showing these segments and all other segments and acknowledgements sent (you can assume no other segment loss). For each segment in your diagram, provide the sequence number and the number of bytes of data; for each acknowledgement that you add, show the acknowledgement number

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