POP3 (non-SSL) uses which port number?

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Prepare for the CPSA Port Numbers Exam with quizzes on port numbers, services, and protocols. Each question is accompanied by hints and detailed explanations. Get exam-ready with our comprehensive study tool!

Multiple Choice

POP3 (non-SSL) uses which port number?

Explanation:
POP3 retrieves mail from a server, and its unencrypted default uses port 110. This is a standard assignment by IANA. If you enable encryption, you typically switch to POP3 over TLS/SSL on port 995. The other port numbers correspond to different services: 119 for NNTP, 123 for NTP, and 554 for RTSP. So the non-SSL POP3 port to remember is 110.

POP3 retrieves mail from a server, and its unencrypted default uses port 110. This is a standard assignment by IANA. If you enable encryption, you typically switch to POP3 over TLS/SSL on port 995. The other port numbers correspond to different services: 119 for NNTP, 123 for NTP, and 554 for RTSP. So the non-SSL POP3 port to remember is 110.

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