Assume an established TCP connection between hosts A and B. At a given time in the communication, A has received from B all data up to and including byte 433. Assume that Host B then sends two segments of data to Host A without delay between them (« back-to-back »). The first and second segments contain 15 and 50 bytes of data, respectively. In the first segment, the sequence number is 434, the source port number is 495, and the destination port number is 344. Host A always sends an acknowledgment when it receives a segment from Host B.
a) What is the sequence number, source port number and destination port number in the second segment sent from Host B to Host A?
b) For the same situation as described above: If the second segment sent arrives at host A before the first segment, what is the receipt number sent from A to B for this segment?