Exercise 7.2 (Window sizes and throughput in TCP-Reno) Consider a single TCP-Reno connection over a link with bandwidth 15 Mbps. Assume each packet has a size of 1500 bytes and the round trip time is 80 ms. Further, we assume packet losses occur when the transmission rate exceeds the link capacity, and no time-out occurs during transmissions. What is the maximum possible window size (in terms of packets) for this TCP connection? Note: In reality, most versions of TCP-Reno set a maximum window size beyond which the window size cannot increase. In this problem, we assume that such an upper limit does not exist, but rather we are interested in computing the maximum window size limit that is naturally imposed by the available bandwidth and the RTT. What are the average window size and average throughput? Hint: The congestion window is set to one-half of the previous value when a packet loss is detected. How many packets were transmitted during the slow-start phase?

Exercise 7.3 (The throughput and delay in TCP-Vegas) Consider the same network as in Exercise 7.2, but assume TCP-Vegas is used. Further, assume = = 150/Tpr. Compute the throughput and queueing delay at the equilibrium point.