1 © 2003, Cisco Systems, Inc. All rights reserved. CCNA 2 Module 3 Configuring a Router.
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Transcript of 1 © 2003, Cisco Systems, Inc. All rights reserved. CCNA 2 Module 3 Configuring a Router.
222© 2003, Cisco Systems, Inc. All rights reserved.
Objectives
• Upon completion of this module, the student will be able to perform tasks related to the following:
• Configuring a router
• Finishing the configuration
333© 2003, Cisco Systems, Inc. All rights reserved.
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
555© 2003, Cisco Systems, Inc. All rights reserved.
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)#
666© 2003, Cisco Systems, Inc. All rights reserved.
Configuring Router Passwords
The service password-encryption command
applies a weak encryption to all
unencrypted passwords.
777© 2003, Cisco Systems, Inc. All rights reserved.
Examining the show Commands
• There are many show commands 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.
888© 2003, Cisco Systems, Inc. All rights reserved.
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
999© 2003, Cisco Systems, Inc. All rights reserved.
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
121212© 2003, Cisco Systems, Inc. All rights reserved.
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.
131313© 2003, Cisco Systems, Inc. All rights reserved.
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.
141414© 2003, Cisco Systems, Inc. All rights reserved.
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.
171717© 2003, Cisco Systems, Inc. All rights reserved.
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.
181818© 2003, Cisco Systems, Inc. All rights reserved.
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
191919© 2003, Cisco Systems, Inc. All rights reserved.
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.