Compare GBN, SR, and TCP (no delayed ACK). Assume the timeout values for all three protocols are sufficiently long such that 6 consecutive data segments and their corresponding ACKs can be received (if not lost on the channel) by the receiving host (Host B) and the sending host (Host A) respectively. Suppose A sends 6 data segments to B and the 2^nd and 3^rd segment (sent from A) is lost. In the end, all 6 data segments have been correctly received by B.

a) How many segments has A sent in total and how many ACKs has B sent in total? What are their sequence numbers? Answer for the three protocols and show the time diagram of the protocol operation.

b. If the timeout values for all three protocols are much longer than 6 RTT, then which protocol successfully delivers all five data segments in shortest time interval.