Which TCP Port is used for Secure Shell (SSH) connections?

Secure Shell (SSH) connections utilize TCP port 22. SSH is a protocol used for secure remote login and other secure network services over an unsecured network. It provides strong authentication and encrypted data communications, which are essential for maintaining security in networked environments.

The correct port, 22, is specifically designated for SSH traffic, allowing for secure management of servers and devices over potentially insecure channels, such as the Internet. This security is crucial for preventing unauthorized access and data breaches.

In contrast, other ports listed have different associated services: port 21 is used for FTP (File Transfer Protocol), port 80 is designated for HTTP (Hypertext Transfer Protocol), and port 53 is utilized for DNS (Domain Name System). None of these other protocols provide the secure shell access that SSH on port 22 does.