When should you use telnet command?

The telnet command is a network protocol used to provide a command-line interface for communication with a remote device or server. While its use has declined in favor of more secure alternatives, there are scenarios where it remains relevant:

• Testing Connectivity: Telnet can be used to test connectivity to a specific port on a server. If you can establish a connection, it confirms that the service on that port is running.
• Debugging Services: It is useful for debugging and diagnosing issues with network services, especially when manual input is needed.
• Accessing Legacy Systems: Some older systems or applications may still rely on telnet for remote access, making it necessary in specific contexts.
• Learning and Experimentation: It's a good tool for learning purposes, especially for understanding how protocols work over a network.

However, it's important to remember that telnet is not secure, as it transmits data in plain text. For secure communications, consider using SSH (Secure Shell) instead.