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Auto-install is a feature of Cisco routers that was designed to enable a new router to come out of its box, get connected to a leased line at a site, download the correct configuration from a network TFTP server, and be up and running without any intervention from the remote site staff This idea is useful for initial installation or maintenance replacement of faulty router hardware This is a very attractive idea for a typical organization that has centrally located network engineering staff responsible for connecting remote offices to the corporate network In practice, it is not always a good idea to depend on this to work in a first-time installation The reason has nothing to do with the Cisco implementation, but relates to the fact that telephone company leased lines tend to have problems when they are first installed If anything disrupts the process of configuration file download, such as a spike or some other interruption to service on the line, the configuration file will be corrupted (remember that TFTP uses UDP and therefore does not have error recovery or retransmissions) When a configuration file is corrupted, the newly installed router will not be reachable over the leased line network connection, and will not use the auto-configuration procedure at boot time once it has a configuration file

The entire contents of the Study Guide are provided in PDF files Adobe s Acrobat Reader has been included on the CD

The CertCam clips are provided as exe les and provide detailed examples of key certi cation objectives These clips walk you step-by-step through various networking tasks You can access the CertCam video clips by clicking the CertCams link off the main splash page, which appears when you place the CD in the CD-ROM tray Once you click the CertCams link, a folder will appear containing all of the CertCams simply double-click a CertCam to play it The CertCam clips are recorded and produced using TechSmith s Camtasia Studio We have compiled each avi le into an exe that contains TechSmith s special AVI codec, custom player, and the AVI itself When you double-click on the exe le, the player is launched automatically and the video is played in the player

ROM contains code that performs power-on diagnostics similar to the power on self-test (POST) that many PCs perform In addition, a bootstrap program in ROM is used to load OS software Although many routers require software upgrades to be performed by removing and replacing ROM chips on the router's system board, other routers might use different types of storage to hold the OS

There are a number of lab les that are used throughout the exercises in the book The lab les are included in the LabFiles folder in the root directory of the CD-ROM The lab les contain items such as packet capture les used to view precaptured traf c, a test web page, and a Security and Backup Plan checklist you can use as a base to build your own checklist

Auto-configuration is useful for getting the correct configuration file to a replacement router When a router is replaced in the field, it is assumed that the initial line problems have been solved and the configuration file will be safely transmitted over the line Let's discuss how auto-configuration works It is assumed that a network configuration similar to that defined in Fig 3-4 is available for this process Step 1 is that the new router to receive the configuration is connected via a DTE/DCE cable to what we will call the staging router In this configuration, the staging router Serial 0 port must be connected to the DCE end of the cable and be configured to supply a clock signal (The details of this configuration are given later in this chapter when we build the lab environment) When the new router is powered on, it will issue what is known as a broadcast SLARP request out of its serial port

There are a number of step-by-step exercises included on the CD that do not appear in the book This lab le, LabBookpdf, is included in the root directory of the CD-ROM

A help file is provided through the help button on the main page in the lower lefthand corner An individual help feature is also available through MasterExam

Appendix:

Random Access Memory (RAM) is used to hold routing tables, perform packet buffering, furnish an area for the queuing of packets when they cannot be directly output due to too much traffic routed to a common interface, and to provide memory for the router's configuration file when the device is operational In addition, RAM provides space for caching ARP information that reduces ARP traffic and enhances the transmission capability of LANs connected to the router When the router is powered off, the contents of RAM are cleared