Which of the following ports is used by Telnet?

The correct answer is B. 23. Telnet uses TCP port 23 for unencrypted remote terminal access. The other ports listed serve different protocols: port 21 is FTP (file transfer), port 80 is HTTP (web traffic), and port 143 is IMAP (email retrieval). Because Telnet transmits data in plaintext, it has largely…

Networking concepts

Question

Options

A21
B23
C80
D143

How the community answered

(17 responses)

B
88% (15)
C
6% (1)
D
6% (1)

Explanation

Telnet uses TCP port 23 for unencrypted remote terminal access. The other ports listed serve different protocols: port 21 is FTP (file transfer), port 80 is HTTP (web traffic), and port 143 is IMAP (email retrieval). Because Telnet transmits data in plaintext, it has largely been replaced by SSH (port 22) in modern environments.

Topics

#Telnet#port 23#well-known ports#protocols

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