Telnet connections operate on which port and protocol?

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Study for the CPSA Port Numbers Exam. Practice with flashcards and multiple choice questions, each with hints and explanations. Get ready for your test!

Multiple Choice

Telnet connections operate on which port and protocol?

Explanation:
Telnet is a simple remote login/terminal protocol that relies on the TCP transport to provide a reliable, ordered stream of bytes for the interactive session. The standard port for Telnet is 23, which is why connections use TCP port 23. The other ports mentioned map to different services: port 22 is SSH (secure remote login), port 80 is HTTP, and port 21 is FTP control. Telnet’s use of plaintext authentication makes it insecure by today’s standards, so SSH is preferred for remote access.

Telnet is a simple remote login/terminal protocol that relies on the TCP transport to provide a reliable, ordered stream of bytes for the interactive session. The standard port for Telnet is 23, which is why connections use TCP port 23. The other ports mentioned map to different services: port 22 is SSH (secure remote login), port 80 is HTTP, and port 21 is FTP control. Telnet’s use of plaintext authentication makes it insecure by today’s standards, so SSH is preferred for remote access.

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