Which of the below is the most acurate as to how a POP3 session works?
Or
B) Client Server ================================================================ Source port 1234 ------connection to------> Desination port 110 Destination port 1234 <-----respondes to-------- Source port 110
This.
Specifically, the client makes a connection (typically using a source port above 1024) to the server (on a well known port; 110 in the case of POP3). Assuming that the server accepts the connection, the connection is uniquely identified by 4 pieces of information (the IP of the client, the IP of the server, the port of the client, and the port of the server). Therefore, the ports must stay the same.
-Scott
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