Remote Connectivity Using Telnet or SSH

Configuring a Device to Accept a Remote Telnet Connection
Router>enable
Router#configure terminal
Router(config)#line vty 0 4
Router(config-line)#password cisco123
Router(config)#login

Configuring a Device to Accept a Remote SSH Connection
Router>enable
Router#configure terminal
Router(config)#username admin password cisco123
Router(config)#ip domain-name example.com
Router(config)#crypto key generate rsa
Router(config)#ip ssh version 2