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enable
Enables higher privilege level access, such as privileged EXEC mode.
At this level you can configure your cisco device without restriction.
Prompt will change from > to #

Example:
Router> enable
Password: [type password and enter]
Router#

disable or exit
Log out from privileged EXEC mode and go to user mode.

Example:
Router# exit
Router>

show running config
Display running configuration.

Example:
Router# show running config

show startup config
Display saved config that load every time cisco startup.

Example:
Router# show startup config

enable secret new password
Create new password to access privileged EXEC mode.

Example:
Router# enable secret mysecretword

configure terminal
Change to Global config mode.
In this mode you can configure entire interface.

Example:
Router# configure terminal
Router(config)#

interface interface name and number
Go to interface setup.

Example:
Router(config)# interface fast 0
Router(config-if)#

ip address ip_number musk_number
Assign an ip address to related interface.

Example:
Router(config-if)#ip address 192.168.10.1 255.255.255.0
Router(config-if)#

no shutdown
Activate related interface.

Example:
Router(config-if)#no shutdown
[message of interface change status appear]

ip route remote_network musk_filter ip_wan_interface_remote_router
Create a static routing. This coomand assign at Global config mode.

Router(config-if)#exit
Router(config)# ip route 192.168.100.0 255.255.255.0 10.10.10.2

copy running start
Saved existing configuration to flash memory.

Router(config)#copy run start
[answer yes for the question]

?
Display all related command. Please do some experiment with this command.

Example:
Router>?
or
Router#?
or
Router#show ?
or
Router#configure ?

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