Suppose the sender is in state “Wait for call 1 from above” and the receiver (the receiver shownin the homework problem) is in state “Wait for 1 from below.” The sender sends a packet withsequence number 1, and transitions to “Wait for ACK or NAK 1,” waiting for an ACK or NAK.Suppose now the receiver receives the packet with sequence number 1 correctly, sends anACK, and transitions to state “Wait for 0 from below,” waiting for a data packet with sequencenumber 0.
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