By default, which of the following ports is used for SMTP?

The correct answer is B. 25. SMTP (Simple Mail Transfer Protocol) uses TCP port 25 by default for server-to-server email transmission. This is a foundational networking port to memorize for CompTIA exams. The other listed ports serve different protocols: port 21 is used by FTP (File Transfer Protocol) for…

Networking

Question

Options

A21
B25
C110
D143

How the community answered

(34 responses)

A
9% (3)
B
88% (30)
C
3% (1)

Explanation

SMTP (Simple Mail Transfer Protocol) uses TCP port 25 by default for server-to-server email transmission. This is a foundational networking port to memorize for CompTIA exams. The other listed ports serve different protocols: port 21 is used by FTP (File Transfer Protocol) for control connections, port 110 is used by POP3 (Post Office Protocol v3) for retrieving email from a server, and port 143 is used by IMAP (Internet Message Access Protocol) for accessing email on a server.

Topics

#SMTP#port 25#email protocols#network ports

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