Which service commonly uses TCP port 22?

Prepare for the ITS Certiport Networking Test. Study with interactive quizzes and detailed explanations. Enhance your understanding and excel in your exam!

Multiple Choice

Which service commonly uses TCP port 22?

Explanation:
Port numbers identify the well-known services a computer offers over TCP, and port 22 is the standard for SSH, the Secure Shell protocol used for encrypted remote login and command execution. That’s why this service is the best answer: it’s designed specifically for secure remote administration over TCP, and it uses port 22 by default. Telnet runs on a different port and sends data in plaintext, making it insecure for remote management. FTP uses port 21 for control (and 20 for data in active mode) and is focused on file transfer rather than remote shell access. HTTPS uses port 443 for secure web traffic, not remote login.

Port numbers identify the well-known services a computer offers over TCP, and port 22 is the standard for SSH, the Secure Shell protocol used for encrypted remote login and command execution. That’s why this service is the best answer: it’s designed specifically for secure remote administration over TCP, and it uses port 22 by default.

Telnet runs on a different port and sends data in plaintext, making it insecure for remote management. FTP uses port 21 for control (and 20 for data in active mode) and is focused on file transfer rather than remote shell access. HTTPS uses port 443 for secure web traffic, not remote login.

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