Question: A wireless link uses the Go-back-N ARQ protocol for flow and error control, with a window size of 8 packets. At some point in time

A wireless link uses the Go-back-N ARQ protocol for flow and error control, with a window size of 8 packets. At some point in time the transmitter sends packets 6,7, and 0. The receiver link layer protocol gets packet 6 without errors, packet 7 with errors, and packet 0 without errors.

a) In a different scenario with the same protocol the sender has three packets to send and then it would become idle for a long time. The sender's Go-back-N protocol transmits these packets with IDs 2, 3, and 4, respectively. Packets 2 and 3 are received with no errors, but packet 4 has uncorrectable errors and is dropped. Explain how the protocol recovers from the damaged packet 4 and delivers all packets. (No need for a drawing; explain with words.)

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