Which interface is commonly used to connect to a Linux server remotely?

The most commonly used interface to connect to a Linux server remotely is SSH, which stands for Secure Shell. SSH is a protocol that provides a secure channel over an unsecured network, allowing users to log into another computer securely. It encrypts the data transmitted between the client and server, ensuring confidentiality and integrity of the information exchanged. This makes SSH an ideal choice for managing systems remotely, executing commands, and transferring files securely.

In contrast, while FTP (File Transfer Protocol) is used for transferring files, it does not provide encryption, making it less secure for remote connections. HTTP (Hypertext Transfer Protocol) is primarily used for accessing web pages and is not intended for command-line access. SMTP (Simple Mail Transfer Protocol) is focused on the transmission of emails and is not designed for remote server management. Therefore, SSH is the preferred and most secure method for accessing Linux servers remotely.