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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What does SSH stand for and what is its purpose?
Why is port 22 specifically used for SSH?
What are the security features of SSH compared to other protocols?