7. Consider the problem of recovering from host crashes (i.e., Fig. 6-18 of textbook; see below). If the interval between writing and sending an acknowledgement, or vice versa, can be made relatively small, what are the two best sender-receiver strategies, for minimizing the chance of a protocol failure? Explain why. Strategy used by receiving host Strategy used by sending host Always retransmit Never retransmit Retransmit in SO Retransmit in S1 First ACK, then write AC(W) AWC C(AW) OK OK DUP OK LOST LOST DUP LOST OK LOST OK OK OK DUP LOST Protocol loses a message First write, then ACK C(WA) OK LOST LOST OK = Protocol functions correctly Protocol generates a duplicate message WAC WC(A) DUP DUP OK OK OK DUP DUP OK

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