Which TCP port does POP3 use by default?
2025
Which TCP port does POP3 use by default?
- A.
25
- B.
143
- C.
110
- D.
587
Attempted by 206 students.
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Correct answer: C
POP3 (Post Office Protocol version 3) is an application-layer internet protocol used by email clients to retrieve emails from a remote server. By default, it operates over unencrypted TCP connections on Port 110. When a secure, encrypted connection (using SSL/TLS) is required to safely download messages, it switches to port 995.