Chapter 3 : Lab 3.1.2 Creating a Logical Network Diagram

Task 1: Use Cisco IOS Commands to Obtain Information about the Network

Step 1: Discover and document the first device

NOTE: If the PCs used in this lab are also connected to your Academy LAN or to the Internet, ensure that you record the cable connections and TCP/IP settings so that these can be restored at the conclusion of the lab.

  1. Your instructor will advise you as to which PC is configured for Administrator access to the network. Access this Admin PC and issue the ipconfig command from the command prompt to discover the default gateway.
  2. Telnet from the command prompt (or use a terminal program such as HyperTerminal or TeraTerm) to the IP address of the gateway device and enter privileged EXEC mode using the passwords given above.
  3. Issue Cisco IOS commands, such as those shown here as well as others you choose to use, to learn about the device.
  4. Issue Cisco IOS commands such as those shown here to discover information about connected devices.
  5. Close the Telnet session by issuing the exit command.

Step 2: Discover the remaining devices

  1. Telnet to the IP address of a device connected to the first device interrogated, and repeat the process in Step 1. Document this new device in an appropriate Device Table.
  2. Repeat this process until all devices in the network are discovered and documented. As you work through the network devices, record the details of each and sketch a diagram of the network devices and their interconnections.

When IP address information has been recorded, what other commands could be used to confirm

connectivity and trace interconnections between devices?

________________________________________________ ping

________________________________________________ tracert and traceroute

Can a connectivity trace be relied upon to return details of all the pathways between devices? Give reasons for your response.

Jawaban: No, all pathways will not be returned because routing at Layer 3 and STP at Layer 2 will cause only one pathway between devices to be shown if redundant or alternate connections exist.

Task 2: Use Cisco Network Assistant to Obtain Information about the Network

Step 1: Launch Cisco Network Assistant

  1. Launch the Cisco Network Assistant program on the PC connected to the network.
  2. Network devices can be accessed for monitoring and information gathering. From the Applications menu, click Connect.
  3. In the Connect dialog box, select the Connect To: option and enter the default gateway of the Admin PC in the field, as shown.

Step 2: Record the network topology

  1. Record the displayed topology. The display will look similar to this sample.
  2. Continue to connect to each known device. Record the topology displayed and compare it with the diagram that you created from the results of Task 1.

Step 3: Collate the network information

Assemble your completed network Device Tables and Topology Diagrams into your FilmCompany case study portfolio for use in later labs.

Step 4: Clean up

Erase the configurations and reload the routers and switches. Disconnect and store the cabling. For PC hosts that are normally connected to other networks (such as the school LAN or to the Internet), reconnect the appropriate cabling and restore the TCP/IP settings.

Task 3: Reflection

  1. These techniques were used to discover and document an enterprise LAN. Would the same techniques work for an enterprise network that included WAN links?
  2. Could these techniques be used in a network that included routers and switches from a manufacturer other than Cisco? Why or why not?      (Cisco Network Assistant only supports devices listed in the FAQ of the program. Other types of software can be used for multi-brand networks)

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