Consider the use of the go-back-n protocol where n=4 for error control for communication from A to B. A packet from A to B, and an ACK from B to A are received in error. (a) (12 pt) Please complete the following diagram. Clearly indicate the sequence number (SN) for packets from A to B, the Response ACK number (RN) for packets from B to A, the time steps and SN of the accepted packets at B, and the windows kept at A in the following figure. (The windows specify the range of sequence # of packets that the sender is allowed to send, e.g., [0, 2] means the sender can send from packet #0 to #2.) Timeout for 0 Window [0,2] [1,2] [2, 2] 1 2 0 SN at Node A X VACKI ACK 001 RN at Node B (b) (4 pt.) Suppose packets are transmitted in error from A to B with a probability of 0.01. Estimate the throughput of this go-back-3 protocol, assuming that the round trip delay is small compared to the transmission delay. Hint: let a = propagation time/transmission time. When a