Cisco Systems CCNA 2 manual Module 4 Learning about Other Devices, Module 4 Caution

Module 4: Learning about Other Devices

Overview

Module 4 will introduce students to the Cisco Discovery Protocol (CDP). CDP is enabled by default on all Cisco devices. CDP allows devices such as Cisco routers to obtain information about directly connected routers, switches, and bridges. CDP functions at Layer 2 in the OSI model. It operates independently of Layer 3, which means that devices can gather information about other directly connected devices regardless of network layer protocol issues.

The first lesson will explain how CDP is used to acquire information about neighboring routers. Students should already know how use serial and Ethernet connections to physically connect routers. Students should also know how to use programs such as HyperTerminal and Telnet to perform router configuration tasks. Review these skills if necessary. Have students perform a standard lab-setup configuration as an optional skill review.

The second lesson will introduce students to the TCP/IP protocol Telnet. Telnet is a remote connection utility that allows network administrators to perform configuration and management tasks on routers and switches. Students will learn how to establish, manage, and terminate Telnet sessions with remote devices. Students should already be familiar with basic router setup and configuration. Students should possess basic router configuration skills and be able to physically connect the devices. Students will use embedded Layer 3 through Layer 7 protocols to establish, test, suspend, or disconnect connectivity to remote devices from the router console.

Module 4 Caution

Most students do not understand that CDP and Telnet are powerful troubleshooting tools. At this point, it is important to provide additional support for students who have not mastered Module 3. Cover this module extensively. Many of the next modules are lab intensive and time intensive.

Students who complete this module should be able to perform the following tasks:

•Enable and disable CDP

•Use the show cdp neighbors command

•Determine which neighboring devices are connected to which local interfaces

•Use CDP to gather network address information about neighboring devices

•Establish a Telnet connection

•Verify a Telnet connection

•Disconnect from a Telnet session

•Suspend a Telnet session

•Perform alternative connectivity tests

39 - 238 CCNA 2: Routers and Routing Basics v3.1 Instructor Guide – Module 4 Copyright ♥ 2004, Cisco Systems, Inc.