SSH

Telnet is not secure. So the secure form of telnet is SSH.

SSH stands for secure shell, it is a telnet with encryption. The information that SSH need is

• User name and password. By doing this we actually create a user account on the switch or router. 
• Assign a Domain name. It’s like a web address www.cisco.com, it is used to generate encryption certificate.      

 3^rd # ip domain-name www.cisco.com      

      

• Generate keys for encryption

3^rd # crypto key generate rsa (after writing the command, specify the size of the key)

• Specify version of SSH.

     3^rd # ip ssh version 2.

• Enable input transport for ssh

3^rd # line vty 0 4

# login local    

# transport input ssh / transport input telnet ssh

CMD doesn’t support ssh, we need to use Tera Term or SecurCRT for this purpose.