GCIA Question #124: Real Exam Question with Answer & Explanation

The correct answer is A. TCP port 143. IMAP4 (Internet Message Access Protocol version 4) listens on TCP port 143 by default for unencrypted client-server communication.

Question

Which of the following ports is the default port for IMAP4 protocol?

Options

ATCP port 143
BTCP port 25
CTCP port 443
DTCP port 80

Explanation

IMAP4 (Internet Message Access Protocol version 4) listens on TCP port 143 by default for unencrypted client-server communication.

Common mistakes.

B. TCP port 25 is the SMTP port used for server-to-server email transfer and mail submission by mail transfer agents, not for IMAP client access.
C. TCP port 443 is reserved for HTTPS (HTTP over TLS/SSL) and is unrelated to the IMAP email retrieval protocol.
D. TCP port 80 is the default port for unencrypted HTTP web traffic and has no association with the IMAP4 protocol.

Concept tested. IMAP4 default TCP port assignment

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

Community Discussion

No community discussion yet for this question.

Full GCIA Practice