Which port is typically used for SSH?

The correct choice, B, is significant because port 22 is the designated port for Secure Shell (SSH) communications. SSH is a protocol used for securely connecting to remote servers and devices, providing a secure channel over an unsecured network. It is widely employed by system administrators to access and manage servers remotely, allowing for command execution, file transfers, and other management tasks.

In contrast, other ports mentioned serve different purposes. Port 21 is primarily used for File Transfer Protocol (FTP), which transfers files but does not include encryption, making it less secure compared to SSH. Port 80 is the default port for Hypertext Transfer Protocol (HTTP), which is used for transmitting web pages over the internet, while port 443 is used for HTTPS, which is the secure version of HTTP, ensuring encryption during data transfer. Understanding these distinct uses helps clarify why port 22 is specifically associated with SSH.