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Command IP Default Gateway Use This command allows the router to maintain routing functionality when it stops being a router. What that means is that, after a router crashes, it falls back to basic switching functionality. The default-gateway is where the router will send all packets. Syntax Router(config)#ip …
Command Username Use Creates a new user on the router. Syntax Router(config)#username <WORD> password <WORD> Example In the following example a new user is created on the router. This user is then used when logging in via a telnet session from R2. CopyR1(config)#username Test password cisco Telnet is …
Command Default Interface Use This command allows you to quickly revert an interface back to its default configuration. If you have a lot of changes, this is much faster than using the no version of every command on the interface. Syntax Router(config)#default interface <interface> Example In this example …
Command Alias Exec Use This command is used to create shortcuts to various commands. While it is definately handy in the real world, we would not recommend using alias exec while studying for the CCNA, as you could potentially get more used to your own commands instead of …
Command Hostname Use Sets the hostname of the router. Syntax Router(config)#hostname <WORD> Example In the below example the hostname command is used to change the router name. CopyR1(config)#hostname TEST TEST(config)#hostname R1 R1(config)#
Command IP nat inside source list Use This command is used to specify an access-list that matches which IPs should be translated. Syntax R1(config)#ip nat inside source list <access-list> <pool or interface> overload Options <pool> Specifies what NAT Pool to use. <interface> Tells NAT to use the IP …
Command router eigrp <AS> Use The router eigrp command is necessary to enable EIGRP (Enhanced Interior Gateway Routing Protocol). EIGRP must be enabled before carrying out any of the EIGRP commands. Syntax R1(config)#router eigrp Example In this example, EIGRP is configured on R1 using router eigrp. First, we …
Command Logging Buffered Use This is a handy command that stores log messages so they can be reviewed later. This is especially useful when you are telneting between multiple routers as you would normally miss the console or debug messages on the router your not connected to. Each …
Command Service Password-Encryption Use Allows you to encrypt all passwords on your router so they can not be easily guessed from your running-config. This command uses a very weak encryption because the router has to be very quickly decode the passwords for its operation. It is meant to …
Command Access-list (standard) Use This command is used to create a list that matches packets on a given criteria. While access-lists are most commonly associated with security, there are numerous uses. Standard lists match on source addresses only. Syntax R1(config)#access-list <1-99 or 1300-1999> <permit or deny> <source address …
