Disable Telnet on Cisco Switch and Router

 1.    You must disable Telnet on your Cisco switch/router since it will be enabled by default and will not disable until you manually disable it.

2.    RTR-01>enable

3.    RTR-01#conf t

4.    RTR-01 (config) #line vty 0 15

5.    RTR-01 (config-line) #transport input ssh
    a.    This transport command is telling the switch/router to only accept SSH connections

6.    RTR-01 (config-line) #end

7.    RTR-01#write