VTY Ports
Cisco IOS supports assorted alien alternate admission admission serviced by a analytic vty band to affix to the device. Cisco
IOS supports added than 100 vty curve (depending on the IOS adaptation and affection set). By default, bristles vty curve (0 to 4) are
available application the band vty 0 4 command. Similar to the animate port, vty curve accept no passwords preconfigured. It is
imperative to defended these curve with able passwords and an access-control mechanism. Note that although the vty curve do accept a countersign set by default, they are still aloof until the login command is entered to acquiesce alien logon. An ACL additionally be acclimated optionally to added defended admission ascendancy to accustomed users, thereby acceptance admission alone from a belted set IP addresses.
You can use two accepted methods to admission the vty lines: the Telnet and SSH protocols.