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Module 3: Configuring a Router
| Command | Command Description | Command Syntax
3.1.1 | configure terminal | This command is used to switch from enable mode to one of the configuration modes. | configure terminal
3.1.2 | hostname | This command is used to give the router a unique name. | hostname hostname
| router rip | To configure the Routing Information Protocol (RIP) routing process, use the router rip global configuration command. | router rip
| interface serial 0 | Use the interface global configuration command to configure an interface type and enter interface configuration mode. | interface type number
3.1.3 | line console 0 | To identify a specific line for configuration and begin the line configuration command collection mode, use the line global configuration command. Entering the line command with the optional line type (aux, console , tty , or vty ) designates the line number as a relative line number. Relative line numbers always begin numbering at zero and define the type of line. | line [aux | console | tty | vty ] line-number [ending-line-number]
| password | To specify a password on a line, use the password line configuration command. Use the no form of this command to remove the password. | password password
| login | To enable password checking at login, use the login line configuration command. | login [local | tacacs]
| line vty 0 4 | To identify a specific line for configuration and begin the line configuration command collection mode, use the line global configuration command. Entering the line command with the optional line type (aux , console , tty , or vty ) designates the line number as a relative line number. Relative line numbers always begin numbering at zero and define the type of line. | line [aux | console | tty | vty ] line-number [ending-line-number]
| show startup-config | This command allows you to view the configuration file "startup-config" in the NVRAM. | show startup-config
| service password-encryption | The service password-encryption command applies a weak encryption to all unencrypted passwords. | service password-encryption
3.1.4 | show ? | The command show ? provides a list of available show commands. | show ?
| show interfaces | Use the show interfaces EXEC command to display statistics for all interfaces configured on the router or access server. | show interfaces {type number}
| show interfaces serial 0/1 | Use the show interfaces EXEC command to display statistics for all interfaces configured on the router or access server. | show interfaces {type number}
| show controllers serial | Use the show controllers serial privileged EXEC command to display information that is specific to the interface hardware. | show controllers serial [slot/port]
| show hosts | To display the default domain name, the style of name lookup service, a list of name server hosts, and the cached list of host names and addresses, use the show hosts EXEC command. | show hosts
| show clock | Shows the time set in the router. | show clock
| show users | Displays all users who are connected to the router. | show users
| show history | Displays a history of commands that have been entered. | show history
| show arp | Displays the arp table of the router. | show arp
| show protocols | Use the show protocols EXEC command to display the configured protocols. | show protocols
3.1.5 | interface serial 0/0 | Use the interface global configuration command to configure an interface type and enter interface configuration mode. | interface type slot/port
| ip address <ip address> <netmask> | To set IP addresses for an interface, use the ip address interface configuration command. The secondary keyword designates an IP address as an auxiliary address. | ip address ip-address mask [secondary]
| clock rate 56000 | Use the clock rate (or clockrate) interface configuration command to configure the clock rate for the hardware connections on serial interfaces such as network interface modules (NIMs) and interface processors to an acceptable bit rate. | clock rate speed-in- bits-per-second
| no shutdown | To disable an interface, use the shutdown configuration command. To restart a disabled interface, use the no form of this command. This should be done on all interfaces in use as they are shutdown by default. | no shutdown
3.1.6 | erase startup-config | To erase a file system, use the erase EXEC command. The erase nvram: command replaces the write erase command and the erase startup-config command. | erase {filesystem:| start-up config}
| copy running-config startup-config | To copy any file from a source to a destination, use the copy EXEC command. Use the /erase option to erase the destination file system before copying. | copy {flash | ftp | nvram | running-config | startup-config | system | tftp} {flash | ftp | nvram | running-config | startup-config | system | tftp}
3.1.7 | shutdown | To disable an interface, use the shutdown configuration command. To restart a disabled interface, use the no form of this command. This should be done on all interfaces in use as they are shutdown by default. | shutdown
| interface fastethernet 0/0 | Use the interface global configuration command to configure an interface type and enter interface configuration mode. | interface type slot/port
3.2.4 | description | To add a description to an interface configuration, use the description interface configuration command. | description string
3.2.5 | banner motd # # | To specify a message-of-the-day (MOTD) banner, use the banner motd global configuration command. | banner motd d message d
| clock timezone | To set the time zone for display purposes, use the clock timezone global configuration command. To set the time to Coordinated Universal Time (UTC), use the no form of this command. | clock timezone zone hours [minutes]
3.2.6 | ip host | To define a static host name-to-address mapping in the host cache, use the ip host global configuration command. To remove the name-to-address mapping, use the no form of this command. | ip host name-of-host [tcp-port-number] ip-address [ip-address2 ... address8]
3.2.7 | show hosts | To display the default domain name, the style of name lookup service, a list of name server hosts, and the cached list of host names and addresses, use the show hosts EXEC command. | show hosts
3.2.9 | copy running-config tftp | To copy any file from a source to a destination, use the copy EXEC command. Use the /erase option to erase the destination file system before copying. | copy {flash | ftp | nvram | running-config | startup-config | system | tftp} {flash | ftp | nvram | running-config | startup-config | system | tftp}
| copy tftp running-config | To copy any file from a source to a destination, use the copy EXEC command. Use the /erase option to erase the destination file system before copying. | copy {flash | ftp | nvram | running-config | startup-config | system | tftp} {flash | ftp | nvram | running-config | startup-config | system | tftp}

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