| Lab 4.5.1 Troubleshooting tools challenge Estimated time: 45 min. Objectives: Identify what troubleshooting tools (IOS commands) are needed to gather basic information about your network. Apply what you have learned in past labs to draw a logical diagram of the network. Background: As you know, having the topology of a network is extremely useful. It allows a network administrator to know exactly what equipment he or she has in what area (for bandwidth needs), how many devices are on the network and the physical layout of the network. In this lab you will need to figure out what a topology looks like based on the information you can gather while navigating through the network using IOS commands. Through the use of show commands, you should be able to see which interfaces are up (using show interface), what devices the router is connected to (using show CDP neighbors) and how the user can get there (using show protocols). With the information received from the show commands, you should be able to remotely access the neighboring routers (using telnet) and through the use of troubleshooting commands (such as ping and trace) you should be able to see which devices are connected. Your final goal is to construct a logical topology drawing of the network by making use of all the above commands without referring to any diagrams ahead of time. Tools / Preparation: Prior to starting this lab you will need to have the equipment for the standard 5-router lab available (routers, hubs, switches, cables, etc.). The routers should be pre-configured by the instructor or lab assistant with the correct IP interface settings etc. The workstations should also be pre-configured to have the correct IP address settings prior to starting the lab. The routers, hubs and workstations should be labeled. You may also work with a portion of the standard lab setup (3 or more of the routers) connected differently than the standard topology if time permits and try to determine the topology. This lab assumes that you have completed the prior labs and that the lab equipment (routers, hub, workstations, etc.) are assembled and connected in the standard lab topology. Work in teams of 3 or more. Before beginning this lab you may want to review Chapters 12 and 13 in the Cisco Networking Academy First-Year Companion Guide and Semester 2 On-line Chapters 3 and 4. Resources Required: 5 PC workstations (min.) with Windows operating system and HyperTerminal installed. 5 Cisco Routers (model 1600 series or 2500 series with IOS 11.2 or later). 4 Ethernet hubs (10BASE-T with 4 to 8 ports). One Ethernet switch (Cisco Catalyst 1900 or comparable). 5 serial console cables to connect workstation to router console port (with RJ45 to DB9 converters). 3 Sets of V.35 WAN serial cables (DTE male/ DCE female) to connect from router to router. CAT5 Ethernet Cables wired straight through to connect routers and workstations to hubs and switches. AUI (DB15) to RJ45 Ethernet transceivers (Quantity depends on the number of routers with AUI ports) to convert router AUI interfaces to 10BASE-T RJ45. Websites Sites Resources: Routing basics General information on routers 2500 series routers 1600 series routers Terms and acronyms IP routing protocol IOS command summary Beginning IP for new users Step 1 - Gather information about the network. Use the standard 5-router lab setup or a subset of 3 or more routers. Verify and document the topology of the network that you are working with or have constructed. You will only be able to connect to the console of one of the routers to find out all information about the other routers and other devices connected to you. A. Connect the console to one of the routers in your network. (All information about the physical structure of the network must be obtained from only one console connection) 1. What command do you use to enter privileged EXEC mode? B. Gather information about the router your console is connected to. 2. What command do you use to gather information about the router you are on? C. Gather information about the devices that are connected to your router. 3. What command do you use to gather information about neighboring devices? D. Gather information about devices on your network but not directly connected to you. 4. You have gathered information about all interfaces on the router you are working with. You also have the IP address of the devices that are directly connected to the router you are working with. With the information obtained describe how and what commands you will need to use to gather more detailed information about devices not directly connected to your router. Step 2 - Draw a logical topology of the network. Using the troubleshooting tools that you have learned from the prior labs in this module, construct a network diagram based on a given topology. In your journal, draw out the logical topology of this network. Include all routers, hubs and switches. Be sure to indicate exactly where there are interfaces. For example, if there is a serial connection from router 1 to router 2, indicate that on the routers. If there is an Ethernet connection to a hub indicate that. Label the diagram with the proper IP addresses and Subnet masks and indicate which end is DCE and which is DTE for each WAN link. 5. Draw the network diagram with the information you have obtained in Step 1.