If the syntax has no errors, the command is executed and stored in the running con?¬?guration, and
it is effective immediately, but the command is not automatically saved to NVRAM.
Cisco IOS Software uses a hierarchy of commands in its con?¬?guration-mode structure. Each
con?¬?guration mode is indicated with a distinctive prompt and supports speci?¬?c Cisco IOS
commands related to a type of operation on the device.
As a security feature, Cisco IOS Software separates the EXEC sessions into the following two
access levels:
?– User EXEC: Allows access to only a limited number of basic monitoring commands.
?– Privileged EXEC: Allows access to all device commands, such as those used for
con?¬?guration and management, and can be password-protected to allow only authorized users
to access the device.
Con?¬?guration Modes of Cisco IOS Software
Depending on the feature being used, there are different con?¬?guration modes when working with
Cisco IOS Software. Figure 1-1 shows the various Cisco IOS con?¬?guration modes employed in
this text.
The ?¬?rst method of con?¬?guration on a Cisco device is the setup utility, which lets you create a
basic initial con?¬?guration.
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