220-801 · Question #15
Which of the following ports is used by default for IMAP traffic?
The correct answer is C. 143. IMAP (Internet Message Access Protocol) uses TCP port 143 by default for retrieving email from a mail server.
Question
Which of the following ports is used by default for IMAP traffic?
Options
- A53
- B110
- C143
- D443
How the community answered
(36 responses)- A6% (2)
- B3% (1)
- C89% (32)
- D3% (1)
Why each option
IMAP (Internet Message Access Protocol) uses TCP port 143 by default for retrieving email from a mail server.
Port 53 is assigned to DNS (Domain Name System) for resolving hostnames to IP addresses, not email retrieval.
Port 110 is the default port for POP3 (Post Office Protocol version 3), a different email retrieval protocol.
Port 143 is the IANA-assigned default port for IMAP (RFC 3501), which allows clients to access and manage email directly on the server without necessarily downloading it. IMAP on port 143 uses plaintext communication, while its secure variant IMAPS uses port 993 over TLS/SSL.
Port 443 is assigned to HTTPS for encrypted web traffic and is not used for standard IMAP communication.
Concept tested: IMAP default port number
Source: https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml
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