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?

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