6. (10 points) Host sends A segments A1, A2, A3 to Host B, their sending sequence number is 30540980 respectively.
(1) How many content bytes does segment A1 carry? How many content bytes does segmentA2 carry?
(2) After the host B has received segment A3, it sends back an acknowledge segment and the acknowledgement number is 1560, how many content bytes does segment A3 carry?
(3) Suppose that segmentA1 gets lost, but A2 reaches to host B, then the 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 the host B sends back an acknowledgment B2 to a. Question: what is the acknowledgement number of the segment B2?

7. (12 points) suppose that missile start algorithm (Also called the TCP Tahoe) is 2 manage congestion of transmission, each segment has a 1 KB size and each sender has the enough data to the congestion Windows size is set to 24 KB, the timer of the timeout is set to 360 ms, then a round of data transmission starts, but soon the an a timeout occurs. Suppose the transmitting time of each segment is very short, and can be neglected, but the delays in the network and the 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 round round 1 2 3... Round 7 of transmission continues, no timeout happens during these transmission. Also, it is known that the congestion window size of 1 round and round 2 is 1 KB and 2 KB respectively.
Both Please calculate the congestion window size of round 3 run 4 round 5 round 6. (3) after the above a timeout, how many milliseconds (ms) should the new time out the timer be set to?