Question: In the TFTP protocol: If the client changes its port number on a subsequent connection, but the server does not, what prevents an old-duplicate data

In the TFTP protocol:

If the client changes its port number on a subsequent connection, but the server does not, what prevents an old-duplicate data packet sent by the server from being accepted by the new client?

If the server changes its port number on a subsequent connection, but the client does not, what prevents an old-duplicate data packet sent by the server from being accepted by the new client?

2. 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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