BasicsEnter Privileged Exec Mode enable
Leave Privileged Exec Mode and go back to User Mode disable
Log out of the router, end the console session,same as exit command exit
Log out of the router, end the console session, same as logout command logout
Setup a basic configuration by answering questions setup
Show the current configuration stored in RAM show running−config
Show the startup configuration stored in NVRAM show startup−config
Display IOS version (configuration register value is also displayed) show version
Show IOS files stored in flash and available free space show flash
Save the current configuration into NVRAM copy running−config startup−config
Use the startup configuration stored in NVRAM copy startup−config running−configLoad a saved configuration from a TFTP server into NVRAM copy tftp running−config
Upgrade the IOS stored in flash from an image stored on a TFTP server copy tftp flash
Create a backup of router IOS and store it in a file on a TFTP server copy flash tftp
Instruct the router to boot from a specific IOS image stored in flash boot system flash [filename]
Instruct the router to boot from a specific IOS image stored on a TFTP server boot system tftp [filename]
Enter Global Configuration Mode config terminal
Set a Message−of−the−day banner to be displayed before the user logs in to the router
banner motd # message #
Set a login message to be displayed before the user logs in to the router banner login # message #
Set a banner to be displayed after the user logs in to the router banner exec # message #
(incoming is displayed with a reverse telnet connection, exec with all others) banner incoming # message #
Give the router a hostname (default is router) hostname [name]
Disable DNS lookups (enabled by default) no ip domain−lookup
Change the size of the history buffer (default is 10 commands) terminal history size 20
PASSWORDS :-
Set a password for Privileged Exec Mode enable password [password]
Set an encrypted password for Privileged Exec Mode enable secret [password]
Set password TELNET access line vty 0 4
login password [passwords]
Set a password for Console Port access line console 0 login password [passwords]
INTERFACE CONFIGURATION:-
Configure the interface Ethernet 0 interface e 0
Configure the first Serial interface interface s 0
Configure the second Token Ring interface interface t 1
Enable an interface no shutdown
Disable an interface shutdown
Set the clock rate on a DCE (make a router a DCE) clock rate 64000
Set the bandwidth bandwidth 64
Display the status of an interface show interface serial 1
Display DTE/DCE state show controller serial 1
Set keepalive period keepalive 10
IP CONFIGURATION:-
Disable IP routing (IP routing is enabled by default) no ip routing
Display IP routing table show ip route
Configure an interface with an IP address ip address 192.168.1.12 255.255.255.0
Enable RIP router rip
network [network−address1]
network [network−address2…]
Enable RIP Triggered updates (only send updates when routing table has changed instead of every 30 seconds) ip rip triggered
Disable automatic route summarization no auto−summary
Enable IGRP router igrp [as−number]
network [network−address1]
network [network−address2…]
