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Module 5: Application Layer & Security

20202m

What is the port number for POP3?

(i) 110
(ii) 90
(iii) 80
(iv) 49

Worked SolutionAI Assisted

Answer: (i) 110

Why: POP3 (Post Office Protocol version 3) uses well-known TCP port 110 (995 for POP3 over TLS). Port 80 is HTTP, port 49 is the LOGIN host protocol, and 90 is not assigned to POP3 — so (ii), (iii) and (iv) are all wrong.

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