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Configuring a Router

Configuring a Router. CCNA 2 v3 – Module 3. CLI Command Modes. User EXEC Privileged EXEC Global Configuration Specific Modes. Configuring a Router. Router(config)#. hostname Tokyo. Tokyo(config)# _. Routers should be given a unique names as one of the first configuration tasks:.

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Configuring a Router

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  1. Configuring a Router CCNA 2 v3 – Module 3 NESCOT CATC

  2. CLI Command Modes User EXEC Privileged EXEC Global Configuration Specific Modes NESCOT CATC

  3. Configuring a Router Router(config)# hostname Tokyo Tokyo(config)# _ Routers should be given a unique names as one of the first configuration tasks: Passwords should be configured for vty lines, the console and to control access to privileged EXEC mode: Router(config)# enable secret class Router(config)# line con 0 Router(config-line)# password cisco Router(config-line)# login To avoid passwords being shown in clear text in the output from the show running-config or show startup-config commands: Router(config)# service password-encryption NESCOT CATC

  4. Show commands Command Displays show interfaces Displays all the statistics for all the interfaces on the router show int s0/1 Statistics for a specific interface (serial 0/1) show controllers s0/1 Displays information-specific to the interface hardware show clock Shows the time set in the router show hosts Displays a cached list of host names and addresses show users Displays all users who are connected to the router show history Displays a history of commands that have been entered show flash Information about flash memory and IOS files stored there show version Information about the router and the IOS running in RAM show arp Displays the ARP table of the router show protocol Global and interface specific status of Layer 3 protocols show startup-config The saved configuration located in NVRAM show running-config Displays configuration currently running in RAM NESCOT CATC

  5. Configuring Serial Interfaces • Enter interface mode: Router(config)# interface serial 0/1 • Specify the interface address and subnet mask: Serial interfaces require a clock signal to control the timing of the communications. DCE devices provide the clock. By default, Cisco routers are DTE devices but they can be configured as DCE devices. Router(config-if)# ip address 192.168.1.1 255.255.255.0 • Set clock rate if a DCE cable is connected (skip this step if a DTE cable is connected): Router(config-if)# clock rate 56000 • Turn on the interface Router(config-if)# no shutdown Router(config-if)# exit Router(config)# _ NESCOT CATC

  6. Examine results: Router# show running-config Intended results? No Remove changes Yes Router(config)# no… Router# copy running start Save changes to backup: Router# copy run start Router# copy running-config tftp Router# copy tftp running-config Router# erase startup-config Router# reload Examine backup file: Router# show startup-config Changing and Saving the Configuration Make changes in configuration mode NESCOT CATC

  7. Interface Descriptions Interface descriptions can be used to identify information such as: • distant router • a circuit number • specific network segment Router(config)# interface ethernet 0 Router(config-if)# description Room C379 LAN Banner MOTD Message-of-the-Day banner can be displayed on all connected terminals: Router(config)# banner motd # Enter TEXT message.BEGIN and END with a character #. #ACME Computer Network – Restricted Access # Router(config)#_ A login banner should be a warning not to attempt login unless authorized. NESCOT CATC

  8. Host Name Configuration Host name resolution associates a host name with an IP address. These address mappings are stored in a host table. Host names, unlike DNS names, are significant only on the router on which they are configured. A host table allows you to type either the host name or the IP address to Telnet or Ping to a remote host. London(config)# ip host London 200.200.200.200 London(config)# ip host NewYork 10.0.0.1 London(config)# ip host Paris 192.168.1.1 London(config)# ip host Munich 172.16.0.1 London(config)# end London# show hosts Default domain is not set Name/address lookup uses domain services Name servers are Host Flags Age Type Address(es) London (perm, OK) ** IP 200.200.200.200 NewYork (perm, OK) ** IP 10.0.0.1 Paris (perm, OK) ** IP 192.168.1.1 Munich (perm, OK) ** IP 172.16.0.1 NESCOT CATC

  9. Configuration files can be stored on a network server, on a TFTP server, or on a disk stored in a safe place. Configuration Backup and Documentation The configuration of network devices determines how the the network will behave. Management of device configuration includes the following tasks: • Listing and comparing configuration files on running devices • Storage of configuration files on network servers • Performing software installations and upgrades Configuration files should be stored as backup files in the event of a problem. Documentation should be included with this offline information. NESCOT CATC

  10. Copying, Editing, and Pasting Configurations My# copy running-config tftp Remote host []? 131.108.2.155 Name of configuration file to write[my-config]? My2 Write file My2 to 131.108.2.155 ? [confirm] y Writing My2 To store the current configuration on a network TFTP server enter the following command: !!!!!!!!!!!!!!!!!!!! [OK] A configuration file stored on one of the network servers can be used to configure a router: Router# copy tftp running-config Host or network configuration file [host]? IP address of remote host[255.255.255.255]? 10.0.0.13 Name of configuration file [Router-config] ? My2 Configure using My2 from 10.0.0.13? [confirm] y Booting My2 from 10.0.0.13: !!!!!! [OK-180/16000 bytes] NESCOT CATC

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