SSH remote login uses which port and protocol?

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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

SSH remote login uses which port and protocol?

Explanation:
SSH remote login uses port 22 over TCP. This pairing is chosen because SSH is a session-based, encrypted protocol that requires reliable, ordered delivery, which TCP provides. The default port 22 is the standard for SSH connections, so clients connect to that port to establish a secure remote login session. The other options correspond to different services: port 23 TCP is Telnet (an older, insecure remote login), port 25 TCP is SMTP for mail, and port 53 UDP is DNS (primarily UDP, with TCP used only for certain situations).

SSH remote login uses port 22 over TCP. This pairing is chosen because SSH is a session-based, encrypted protocol that requires reliable, ordered delivery, which TCP provides. The default port 22 is the standard for SSH connections, so clients connect to that port to establish a secure remote login session. The other options correspond to different services: port 23 TCP is Telnet (an older, insecure remote login), port 25 TCP is SMTP for mail, and port 53 UDP is DNS (primarily UDP, with TCP used only for certain situations).

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