Question: In an RPC-like protocol in which multiple requests can be outstanding, and replies can be sent in any order: Assume that requests are numbered and

In an RPC-like protocol in which multiple requests can be outstanding, and replies can be sent in any order: Assume that requests are numbered and that ACK[N] acknowledges reply[N]. Should ACKs be cumulative? If not, what should happen if an ACK is lost?

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