L6 CISCO IOS

IOS (Internetwork Operating System)

is a Cisco propriety for Cisco

networking devices like routers and switches.

IOS

is an application which run as operating system for the networking

devices like router or switch

User Exec Mode

• User mode can be identified > symbol after router name like Router>

• The basic mode of Cisco IOS command

Privileged EXEC Mode

• This is the second mode of the IOS. This mode can be accessed only from the user exec mode by executing

the enable command.

Global configuration mode

• As the name suggests, this mode includes the commands that are used to configure the device. From this mode,

a user can not only configure new settings but can also change, update or delete existing settings.

Host Names

The unique identifier that serves as name of your computer or server can be as

long as 255 characters and consists of numbers and letters.

Securing Device Access

• To help ensure the security of a network, access to the network devices should be protected.

Enable password

Limits access to the privileged

EXEC mode

Enable secret

Encrypted, limits access to the privileged EXEC mode

Console password

Limits device access using the

console connection

VTY password

Limits device access over SSH or

Telnet