Selective Repeat Protocol

Consider a source S and a destination D using the Selective Repeat Protocol (SRP) with a window size of N=4N=4. Each packet is 10001000 bits. The delays are as follows: Each packet transmitted by S has a transmission time of 10 ms10ms. The end-to-end delay from the time that S starts transmitting a packet until D completely receives that packet is 100 ms100ms. Each ack transmitted by D has a transmission time of 1 ms1ms. The end-to-end delay from the time that D starts transmitting an ack until S completely receives that ack is 100 ms100ms. The timeout value is 300 ms300ms. Here is what happens to each packet: Packet #0 is received by D, and the corresponding ACK is received by S. The first transmission of packet #1 is dropped by a router in between S and D. The second transmission of packet #1 is received by D, and the corresponding ACK is received by S. The first transmission of packet #2 is dropped by a router in between S and D. The second transmission of packet #2 is received by D, and the corresponding ACK is received by S. Packet #3 is received by D, and the corresponding ACK is received by S. Packet #4 is received by D, and the corresponding ACK is received by S. Packet #5 is received by D, and the corresponding ACK is received by S. (a) At time t = 150 mst=150ms, what is S’s window? (b) At what time does the retransmission of packet #1 start? (c) At what time does the application layer at D receive packet #2? (d) What is the throughput during the time from t = 0 mst=0ms until t = 500 mst=500ms? Write your answers for parts (a)-(d) (as well as any diagram or equations use to obtain your answers) on paper, and upload the image here: For more information on Selective Repeat Protocol read this: https://en.wikipedia.org/wiki/Selective_Repeat_ARQ

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