Question: ( Connection - oriented transport: TCP ) Host A and B are communicating over a TCP connection, and Host B has already received from A

(Connection-oriented transport: TCP) Host A and B are communicating over a TCP connection, and Host B has
already received from A all bytes up through byte 86. Suppose Host A then sends two segments to Host B back-to-back.
The first and second segments contain 40 and 20 bytes of data, respectively. In the first segment, the sequence number
is 87, the source port number is 272, and the destination port number is 80. Host B sends an acknowledgment whenever
it receives a segment from Host A.

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