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Basic IOS Commands
Basic Cisco IOS commands
31
Computer Networking
Professional
09/02/2015
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Term
The command to change from user EXEC to privileged EXEC mode.
 Definition
R>enable
Term
The command to change back to user EXEC from privileged EXEC mode.
 Definition
R# disable
Term
The command to enter global configuration mode.
 Definition
R#conf t
Term
The command for entering interface configuration mode.
 Definition
(config)#interface <int#>
Term
The command for getting into line configuration mode.
 Definition
(config)#line <line>
Term
The command for entering router [protocol] configuration mode.
 Definition
(config)#router <protocol> [area | AS]
Term
The command for displaying the current running configuration.
 Definition
#show run
Term
The command for setting the hostname of the device.
 Definition
(config)#hostname <name>
Term
Set the enable password to 'cisco'
 Definition
(config)#enable password cisco
Term
Set the enable secret password to 'cisco'.
 Definition
(config)#enable secret cisco
Term
Set the password and enable logins for the VTY and console lines.
 Definition

(config-line)#password 'cisco'

(config-line)#login
Term
Encrypts all passwords, both running and startup configs.
 Definition
(config)#service password-encryption
Term
Set the domain name for a device (required for SSH).
 Definition
(config)#ip domain-name <domain>.com
Term
Command for enabling RSA encryption and generating a security key.
 Definition
(config)#crypto key generate rsa
Term
Force a specific protocol (or allow all) for VTY line access.
 Definition
(config-line)#transport input [all|none|ssh|telnet]
Term
Save the running configuration to NVRAM.
 Definition
#copy run start
Term
Erase the configuration stored in NVRAM (startup config).
 Definition
#erase start
Term
Display the configuration in RAM.
 Definition
#show run
Term
Display the configuration stored in NVRAM.
 Definition
#show start
Term
Display the status of all device interfaces.
 Definition
#show int
Term
Display details of a specific interface.
 Definition
#show int <int#>
Term
Display an overview of all interfaces, including IP address and port status.
 Definition
#show ip int br
Term
Display the status of layers 1 and 2 of each interface as well as the IP addresses used.
 Definition
#show protocols
Term
Displays a list of directories and files in flash memory.
 Definition
#show flash
Term
Display information about the currently loaded software along with hardware and device information.
 Definition
#show version
Term
Set the configuration register to boot the IOS from Flash & startup-config from NVRAM.
 Definition
(config)#config-reg 0x2102
Term
On next boot, the device will boot into ROMMON, skipping the IOS.
 Definition
(config)#config-reg 0x2100
Term
On next boot, the device will ignore the startup-config in NVRAM (used to provide password recovery).
 Definition
(config)#config-reg 0x2142
Term
Command to reboot a switch/router.
 Definition
#reload
Term
Command to copy the current IOS image to a TFTP server.
 Definition
#copy flash tftp
Term
Command to download a new IOS image from a TFTP server.
 Definition
#copy tftp flash
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