(ISC)2 Certified in Cybersecurity Practice Exam

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What is port 22 used for?

HTTP
SSH
FTP
SMB

The correct answer is: SSH

Port 22 is primarily used for Secure Shell (SSH), which is a protocol that provides a secure channel over an unsecured network in a client-server architecture. SSH is utilized for securely accessing and managing devices over a network, including servers, routers, and switches. The security features of SSH include data encryption, integrity checking, and authentication, which collectively help protect against various types of network attacks and eavesdropping. The use of port 22 is integral to remote administration tasks, allowing network administrators and users to log in securely to remote systems, execute commands, and transfer files safely. Because SSH encrypts the data being transmitted, it offers a higher level of security compared to older protocols such as Telnet, which operate over unencrypted connections. For context, other ports mentioned in the question serve different purposes: HTTP typically utilizes port 80 for web traffic, FTP operates over ports 20 and 21 for file transfers, and SMB generally uses port 445 for sharing files and printers over a network. Each of these protocols has unique use cases, making port 22 distinct in its function related to secure remote access.