Which of the following would be valid source and destination ports for a host connecting to an email server?
- Source: 25, Destination: 49152
- Source: 80, Destination: 49152
- Source: 49152, Destination: 25
- Source: 49152, Destination: 80
Explanation: The destination port is the well-known port for Simple Mail Transport Protocol, which is 25. This is the port that the mail server will be listening on. The source port is dynamically selected by the requesting client and can be 49152.
More Questions: 14.5.6 Check Your Understanding – TCP Communication Process