Enable and password protect telnet logins to Cisco routers

The ability to telnet to a Cisco router makes administration easier. This simple configuration enables telnet logins to the router and protects them with a password.

To enable telnet logins with the password PaSsWoRd:

conf t
line vty 0 4
login
password PaSsWoRd

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courtesy  http://www.tech-recipes.com/rx/81/enable-and-password-protect-telnet-logins-to-cisco-routers/