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You are setting up remote access on your Cisco IOS switch. What is the purpose of the "login" command when issued in [line vty] configuration mode?
It is used to grant access to the vty lines by using a password.
router(config-line)#line vty 04 (virtual telnet line 0 though 4)
to enable the vty lines so we can access to switch remotly
TO ENABLE THE TELNET CONFIGURATION WE USE THE COMMAND LINE VTY
LOGIN
Use of Login command is that when you login in router or switch it will ask for password.