Which port and protocol is used for Telnet?

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Prepare for the CPSA Port Numbers Exam with quizzes on port numbers, services, and protocols. Each question is accompanied by hints and detailed explanations. Get exam-ready with our comprehensive study tool!

Multiple Choice

Which port and protocol is used for Telnet?

Explanation:
Telnet uses port 23 over TCP to provide an interactive, text-based session. TCP gives the reliable, ordered byte stream needed for real-time remote input and output, which is why port 23 is paired with TCP for Telnet. The other options mix in mismatched ports or protocols: port 22 TCP is SSH (secure remote login), port 21 TCP is FTP’s control channel, and port 53 UDP is DNS. Telnet’s standard pairing is TCP on port 23.

Telnet uses port 23 over TCP to provide an interactive, text-based session. TCP gives the reliable, ordered byte stream needed for real-time remote input and output, which is why port 23 is paired with TCP for Telnet. The other options mix in mismatched ports or protocols: port 22 TCP is SSH (secure remote login), port 21 TCP is FTP’s control channel, and port 53 UDP is DNS. Telnet’s standard pairing is TCP on port 23.

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