计算机网络英文题库(附答案)chapter3(推荐文档)

ACK flag bit= c Sequence number=100 Packet ③: SYN flag bit= d ACK flag bit=1

Sequence number= e

5. Consider sending an object of size O=100 Kbytes from server to client. Let S=536 bytes and RTT=100msec. Suppose the transport protocol uses static windows with window size W.

(1) For a transmission rate of 25 kbps, determine the minimum possible latency. Determine the minimum window size that achieves this latency. (2) Repeat (1) for 100 kbps.

6. Consider the following plot of TCP congestion window size as a function of time. Please fill in the blanks as below.

16 a) The initial value of Threshold at the first transmission round is____. b) The value of Threshold at the 11th transmission round is_____. c) The value of Threshold at the 21st transmission round is_____.

Congestion window size 12 8 4 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Transmission round

d) After the 9th transmission round, _____ occurs. e) After the 19th transmission round, ____ are detected.