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CCNA 2 Module 3 Configuring a Router

CCNA 2 Module 3 Configuring a Router. Objectives. Upon completion of this module, the student will be able to perform tasks related to the following: Configuring a router Finishing the configuration. Overview. Name a router Set passwords Examine show commands

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CCNA 2 Module 3 Configuring a Router

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  1. CCNA 2 Module 3 Configuring a Router

  2. Objectives • Upon completion of this module, the student will be able to perform tasks related to the following: • Configuring a router • Finishing the configuration

  3. Overview • Name a router • Set passwords • Examine show commands • Configure a serial interface • Configure an Ethernet interface • Execute changes to a router • Save changes to a router • Configure an interface description • Configure a message-of-the-day banner • Configure host tables • Understand the importance of backups and documentation

  4. Command-Line InterfaceCommand Modes

  5. Configuring a Router Name A router should be given a unique name as one of the first configuration tasks. This task is accomplished in global configuration mode using the following commands: Router(config)#hostname TokyoTokyo(config)#

  6. Configuring Router Passwords The service password-encryption command applies a weak encryption to all unencrypted passwords.

  7. Examining the show Commands • There are many showcommands that you can use to examine the contents of files in the router and for troubleshooting. • In both privileged EXEC and user EXEC modes, the command show ? provides a list of available show commands.

  8. Examining the show CommandsContinued • show interfaces – Displays all the statistics for all the interfaces on the router • 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 – Displays information about flash memory and what IOS files are stored there

  9. Examining the show CommandsContinued • show version – Displays information about the router and the IOS that is running in RAM • show ARP – Displays the ARP table of the router • show protocol – Displays the global and interface specific status of any configured Layer 3 protocols • show startup-configuration – Displays the saved configuration located in NVRAM • show running-configuration – Displays the configuration currently running in RAM

  10. show version Command Example

  11. Serial Interface Configuration Commands

  12. Configuring an Ethernet Interface To configure an Ethernet interface follow these steps: • Enter global configuration mode. • Enter interface configuration mode. • Specify the interface address and subnet mask. • Enable the interface.

  13. Configuring an Serial Interface To configure an Ethernet interface follow these steps: • Enter global configuration mode. • Enter interface configuration mode. • Specify the interface address and subnet mask. • Set clock rate if a DCE cable is connected. Skip this step if a DTE cable is connected. • Enable the interface.

  14. Configuring Interface Descriptions • An interface description should be used to identify important information such as a distant router, a circuit number, or a specific network segment. • A description of an interface can help a network user remember specific information about the interface, such as what network the interface services.

  15. Interface Description

  16. Login Banners

  17. Login Banners (MOTD) • A login banner is a message that is displayed at login. • Login banners can be used to convey messages that affect all network users, such as scheduled system shutdowns. • Login banners can be seen by anyone. • “Welcome” is an invitation for anyone to enter a router and is probably not an appropriate message. • A login banner should warn users not to attempt login unless they are authorized. • A message such as “This is a secure system, authorized access only!” informs unwanted visitors that any further intrusion is illegal.

  18. Configuring Message-of-the-Day (MOTD) • Enter global configuration mode to configure a message-of-the-day (MOTD) banner. • Use the banner motd command, followed by a space and a delimiting character, such as the pound sign (#). Add a message-of-the-day (MOTD) followed by a space and the delimiting character again

  19. Host Name Resolutions • Host name resolution is the process that a computer system uses to associate a host name with an IP address. • Host names, unlike DNS names, are significant only on the router on which they are configured.

  20. Configuring Host Tables

  21. Configuring Host TablesContinued

  22. Configuration Backup and Documentation

  23. Using the copy running-config tftp Command

  24. Using the copy tftp running-config Command

  25. Summary

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