Question: Problem 3. (12 marks) The behavior of a TCP protocol can be described as follows. Assume that ssthreshold is initially set as 16 and TCP

Problem 3. (12 marks) The behavior of a TCP protocol can be described as follows. Assume that ssthreshold is initially set as 16

Problem 3. (12 marks) The behavior of a TCP protocol can be described as follows. Assume that ssthreshold is initially set as 16 and TCP starts at Transmission round 1 with initial cwnd=1 MSS. TCP has a triple duplicated ACK when cwnd reaches 20, and then TCP has a timeout when cwnd reaches 18. Suppose TCP Reno is used and for fast recovery cwnd = ssthreshold/2+3 MSS. Draw the diagram of cwnd using the grid coordinates at the next page and answer the following questions. (a) (4 marks) What is congestion window size (cwnd) during transmission round 7? (b) (4 marks) What is congestion window size (cwnd) during transmission round 14? (c) (4 marks) Suppose TCP Tahoe is used instead of TCP Reno, what is congestion window size (cwnd) during transmission round 12? 1 1 I 1 T 1 - - 1 | - - - 1 1 - - 1 1 - 1 1 - (cwnd) Congestion window size - 1 IJ 1 - J 1 20 18 16 14 12 10 8 6 4. 2 0 - - - - J- - 1 - - - - 1 T J 1 1 - - - 02 14 16 18 4 6 8 10 12 Transmission round Figure 1: The grid coordinates used for Problem 3

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