Quote Originally Posted by marks98 View Post
my teacher says use telnet to test connectivity, theres 16 routers in the class... and telnet tests data link, transport and network layers so thats the best way ehh
Telnet is a great tool to test if a port is open (telnet {address} 25 to see if smtp is working, etc) but it's a shitty way to remote into your device and manage it. SSH does the same exact thing but encrypted and reasonably secure. If you leave a telnet port open to the internet you're going to get hacked within an hour.