Transcript CCNA2v3_M03
CCNA 2 Module 3 Configuring a Router © 2003, Cisco Systems, Inc. All rights reserved. 1 Objectives • Upon completion of this module, the student will be able to perform tasks related to the following: • Configuring a router • Finishing the configuration © 2003, Cisco Systems, Inc. All rights reserved. 2 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 © 2003, Cisco Systems, Inc. All rights reserved. 3 Command-Line Interface Command Modes © 2003, Cisco Systems, Inc. All rights reserved. 4 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 Tokyo Tokyo(config)# © 2003, Cisco Systems, Inc. All rights reserved. 5 Configuring Router Passwords The service passwordencryption command applies a weak encryption to all unencrypted passwords. © 2003, Cisco Systems, Inc. All rights reserved. 6 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. © 2003, Cisco Systems, Inc. All rights reserved. 7 Examining the show Commands Continued • 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 © 2003, Cisco Systems, Inc. All rights reserved. 8 Examining the show Commands Continued • 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 © 2003, Cisco Systems, Inc. All rights reserved. 9 show version Command Example © 2003, Cisco Systems, Inc. All rights reserved. 10 Serial Interface Configuration Commands © 2003, Cisco Systems, Inc. All rights reserved. 11 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. © 2003, Cisco Systems, Inc. All rights reserved. 12 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. © 2003, Cisco Systems, Inc. All rights reserved. 13 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. © 2003, Cisco Systems, Inc. All rights reserved. 14 Interface Description © 2003, Cisco Systems, Inc. All rights reserved. 15 Login Banners © 2003, Cisco Systems, Inc. All rights reserved. 16 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. © 2003, Cisco Systems, Inc. All rights reserved. 17 Configuring Message-of-the-Day (MOTD) • Enter global configuration mode to configure a messageof-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 © 2003, Cisco Systems, Inc. All rights reserved. 18 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. © 2003, Cisco Systems, Inc. All rights reserved. 19 Configuring Host Tables © 2003, Cisco Systems, Inc. All rights reserved. 20 Configuring Host Tables Continued © 2003, Cisco Systems, Inc. All rights reserved. 21 Configuration Backup and Documentation © 2003, Cisco Systems, Inc. All rights reserved. 22 Using the copy running-config tftp Command © 2003, Cisco Systems, Inc. All rights reserved. 23 Using the copy tftp running-config Command © 2003, Cisco Systems, Inc. All rights reserved. 24 Summary © 2003, Cisco Systems, Inc. All rights reserved. 25