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Which of the following port numbers is commonly used for Secure Shell (SSH) to securely log into a remote computer or server?
80
25
20/21
22
SSH is a protocol used for secure remote login and other secure network services. It is commonly associated with port number 22, thus the correct answer is 22. It's important to memorize standard port numbers as they are frequently referenced in networking and security tasks. Port 20/21 is used for FTP, port 25 is for SMTP, and port 80 is for HTTP, making these options incorrect for SSH.
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