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ssh - SSH works by connecting a client program to an ssh server.telnet - You can install the old telnet server on your linux system and use it to connect sending your password as plain text and then work in a remote shell with everything being sent as plain text, in the event you wish to share everything you are doing with anyone listening with a packet sniffer at any point between you and the remote host. ssh - SSH works by connecting a client program to an ssh server. Use ssh as the modern secure alternative to telnet. Connect to your linux host from another linux host or a host with a different operating system such as Microsoft Windows. On Microsoft Windows you can use the free ssh client Putty to connect via ssh.[[Netcat]] - netcat has been around a long time and should be harmless to have on your system unless you really open things up like a fool.