What port is typically used for SSH access to a remote server?

SSH, or Secure Shell, is a protocol used to securely access and manage networked devices, including servers. The standard port for SSH communication is TCP 22. This port is designated specifically for the SSH protocol, allowing it to provide secure encrypted communication over an insecure network.

Using TCP 22 ensures that data transmitted between the client and the server is protected from eavesdropping, man-in-the-middle attacks, and other vulnerabilities commonly found in unencrypted communication methods. The encryption methods used in SSH enhance the confidentiality and integrity of the data exchanged.

The other ports mentioned are associated with different protocols: TCP 20 and TCP 21 are commonly used for FTP (File Transfer Protocol), while TCP 23 is typically used for Telnet, which does not offer the same level of security as SSH. Thus, TCP 22 is the correct choice for secure remote server access using SSH.