6. (10 points) Host A sends segments A1, A2, A3 to host B, their sending sequence number is 30,540,980 respectively.
(1) How many payload bytes does segment A1 carry? How many payload bytes does segmentA2 carry?
(2) After host B has received segment A3, it sends back an acknowledge segment and the acknowledgement number is 1560, how many payload bytes does segment A3 carry?
(3) Suppose that segmentA1 gets lost, but A2 reaches to host B, then host B sends back an acknowledgment B1 to A. Question: what is the acknowledgement number of the segmentB1?
(4) Suppose that segmentA2 gets lost, but A1, A3 reaches to host B, then host B sends back an acknowledgment B2 to A. Question: what is the acknowledgement number of the segment B2?
7. (12 points) suppose that slow start algorithm (Also called TCP Tahoe) is used to manage congestion of transmission, each segment has a 1KB size and each sender has enough data to transmit. Congestion windows size is set to 24KB,timer of timeout is set to 360ms, then a round of data transmission starts, but soon an timeout occurs.Suppose the transmitting time of each segment is very short, and can be neglected, but the delays in network and not small value.
(1) after the above time out, how many KBs should the new threshold be set to?
(2) after the above time out, round 1 round 2 round 3…… round 7 of transmission continues, no timeout happens during these transmission. also, it is known that the congestion window size of round 1 and round 2 is 1KB and 2KB respectively.
Please calculate the congestion window size of round 3 run 4 round 5 round 6.(3) after the above timeout, how many milliseconds(ms) should the new time out timer be set to?
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