Suppose TCP Reno is used to transfer a large file over a path with bandwidth high enough that, during slow start, cwnd can be treated as doubling each RTT as in 13.2 Slow Start. Assume the receiver places no limits on window size. (a). How many RTTs will it take for the window size to first reach ~8,000 packets, assuming unbounded slow start is used and there are no packet losses? 80 (b). Approximately how many packets will have been sent and acknowledged by that point? (c). Now assume the bandwidth is 100 packets/ms and the RTT is 80 ms, making the bandwidthÃdelay product 8,000 packets. What fraction of the total bandwidth will have been used by the connection up to the point where the window size reaches 8000? Hint: the total bandwidth is 8,000 packets per RTT.
