What methods can be used to connect to a Linux server?

There are several common ways to connect to a Linux server:

1. SSH (Secure Shell) — the most popular and secure method for remote access to the server via the command line.

   ssh user@server_ip
   

2. SFTP/FTP — for file transfer, often used together with SSH (SFTP).

3. Telnet — an outdated protocol for remote access, not recommended due to lack of encryption.

4. VPN — to create a secure communication channel with the server in a private network.

5. Remote Desktop Protocol (RDP) — if the server has a graphical interface and RDP support.

6. Web interfaces — such as server management panels (Webmin, cPanel).

In practice, SSH is most commonly used because it provides secure and convenient access to the server's command line.