GCIA · Question #124
Which of the following ports is the default port for IMAP4 protocol?
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
How the community answered
(22 responses)- A73% (16)
- B18% (4)
- C5% (1)
- D5% (1)
Why each option
IMAP4 (Internet Message Access Protocol version 4) listens on TCP port 143 by default for unencrypted client-server communication.
RFC 3501 defines IMAP4rev1 as operating over TCP port 143 for standard plaintext connections. This port is assigned by IANA specifically to IMAP and is the universally expected default that mail clients use when connecting to an IMAP server without SSL/TLS (IMAPS uses port 993).
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.
TCP port 443 is reserved for HTTPS (HTTP over TLS/SSL) and is unrelated to the IMAP email retrieval protocol.
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
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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