Consider the following graph which illustrates the TCP Reno window size versus time. Assume at time 0 sender attempts to open a connection. Moreover, assume that the sender can write data instantaneously. Hence, the only latency factor is the propagation delay of the network. Assume that the network has an MSS of 1000 bytes.

 

1. Name the events at A, B, and C.
2. At point A, sender sets its window size to wl and sends the appropriate number of packets accordingly. Right after the sender was supposed to increase its window size, the sender realizes that it must decrease its window size to w2 instead.

a. Find the value of w1 if the sender has written 31000 bytes to the network before decreasing its window size.
b. Find the value of the round-trip-time (RTT) between sender and receiver if sender reduces its window size at T1: 1-5_sec

3. At point B, sender sets its window size to w4 and sends the appropriate number of packets accordingly. Right after the sender was supposed to increase its window size, the sender realizes that it must decrease its window size to w1 instead.

a. Find the value of w4.
b. Find the value of T2, i.e., the time that sender reduces its window size.

Window size T1 Time T3 14-13