tailieunhanh - CCNA 1 and 2 Companion Guide, Revised (Cisco Networking Academy Program) part 66

Cisco Networking Academy Program CCNA 1 and 2 Companion Guide, Revised part 66 is the Cisco approved textbook to use alongside version of the Cisco Networking Academy Program CCNA 1 and CCNA 2 web-based courses. The topics covered provide you with the necessary knowledge to begin your preparation for the CCNA certification exam (640-801, or 640-821 and 640-811) and to enter the field of network administration. | Page 619 Tuesday May 20 2003 2 53 PM Page 620 Tuesday May 20 2003 2 53 PM Objectives Upon completion of this chapter you will be able to Describe how to implement monitor and maintain CDP Understand how to create a network map of the environment Disable and troubleshoot CDP Telnet remotely to other routers Verify disconnect and suspend a Telnet connection Perform alternative connectivity tests Page 621 Tuesday May 20 2003 2 53 PM Chapter 13 Learning About Neighboring and Remote Devices In this chapter you learn how to implement monitor and maintain Cisco Discovery Protocol by using the correct router commands. In addition this chapter explains the commands most often used to perform address-related troubleshooting. Please be sure to look at the e-Labs Videos and PhotoZooms associated with this chapter that you will find on the CD-ROM accompanying this book. These CD elements are designed to supplement the material and reinforce the concents introduced in this chapter. Introduction to CDP Cisco Discovery Protocol CDP is a Layer 2 protocol that connects lower physical media and upper network layer protocols as shown in Figure 13-1. CDP is used to obtain information about neighboring devices. This information shows the types of devices connected the router interfaces they are connected to the interfaces used to make the connections and the model numbers of the devices. CDP is media and protocol independent and runs on all Cisco equipment over the Subnetwork Access Protocol SNAP . CDP is a proprietary protocol native to Cisco networking devices and will run only on Cisco networking devices. CDP Version 2 CDPv2 is the most recent release of the protocol. Cisco IOS Software Release 3 T version or later supports CDPv2. CDP Version 1 CDPvl is enabled globally by default with Cisco IOS Software Release or later.

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