Selective Repeat vs Go-Back-N. [16 points) If using Selective Repeat, and your header field corresponding to the sequence number is 6 bits wide, then what is the largest window size possible? a. Assume the sender sends packets with sequence numbers 21-29. (At this point, ACKs have been received for all previously sent packets.) The receiver correctly receives packets 21, 22, 23, 24, 27 and 29, and generates ACKs for these packets as they arrive. The sender then receives the acknowledgements generated by the receiver. Assume packets that were not received were lost. Draw the timing diagram for this scenario if Go-Back-N is used. Which packet(s) will be retransmitted by the sender, if any? Explain. b. Assume the bandwidth of a connection is 200 Mbps, each data packet is 2,500 bytes long total and the ACK packets have negligible lengths. Assume that you use the Selective Repeat protocol with a window size of 100 packets. What should the maximum round-trip delay be in order to achieve a bandwidth utilization of 100%? c