Question-4: (15 Marks) Two processes at the application layers of sender and receiver are communicating each other. Transport layers of both ends are using a stop-and-wait protocol for flow and error control for this communication An example flow diagram of data and acknowledgement exchange between the nodes has been presented in the following. Req: Request from process pArr: Packet arrival aArr: ACK arrival T-Out: Time out occurs Receiver Events: laver layer Packet 0 AIT -,--..-. ACK 1 0101:0:1 Stop ( OLOTORT Packet 1 010:1:0:1 Packet I (resent) Time-out; restarTOut ACK 0 aArr OLO : Packet0 ACK I Time-out; restart ( T:0 Packet 0 (resent) pAr Packet 0 ACK 1 discarded (a duplicate) Arr Create a flow diagram of data and acknowledgement exchange using stop-and-wait protocol similar to the above diagram where sender sends three packets. The first two packets arrived in time and acknowledgement also received. However third packet was delayed and resent. The duplicate third packet was received after the acknowledgement of original one a) b) Show all timer activities (starts and so on) at the sender side with clear indication of sending and c) Show all data acknowledgment, sender and receiver sliding windows and with appropriate d) Show all the exchange of data and acknowledgement for above three packets in your diagram receiving time (receiving side) sequence numbers in the windows for both sides and next packet indicator Explain the fact how the duplicate third packet and acknowledgements were exchanged