Which of the following is the default port for POP3?

The correct answer is B. 110. POP3 (Post Office Protocol version 3) uses port 110 by default for retrieving email from a mail server.

Advanced Incident Response & Digital Forensics Fundamentals

Question

Options

A21
B110
C80
D25

How the community answered

(22 responses)

A
5% (1)
B
77% (17)
C
9% (2)
D
9% (2)

Why each option

POP3 (Post Office Protocol version 3) uses port 110 by default for retrieving email from a mail server.

A21

Port 21 is assigned to FTP (File Transfer Protocol) for control connections, not email retrieval.

B110Correct

Port 110 is the IANA-assigned well-known port for POP3, as defined in RFC 1939. POP3 clients connect to this port to authenticate and download messages from a mail server. The secure variant, POP3S, uses port 995.

C80

Port 80 is assigned to HTTP (Hypertext Transfer Protocol) for web traffic, not email retrieval.

D25

Port 25 is assigned to SMTP (Simple Mail Transfer Protocol) for sending and relaying email between servers, not for client email retrieval.

Concept tested: Well-known port numbers for common protocols

Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml

Topics

#POP3#port 110#email protocols#well-known ports

Community Discussion

No community discussion yet for this question.

Full GCIA Practice