CCNA 1. Networking Basics v3.1.1 Student Lab Manual (796248), страница 19
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Active collection of statistical data is delayed for the first 10 minutes. An actualproduction network might take 30 minutes or more before most data is discovered.After a few minutes, the Console window should start showing information about the network. In thefollowing example, two additional workstations were added.Note: Entries from previous sessions may be seen.
It will take a few minutes for the entriesto match the network. In the Agent window, under the Database/Address tab, there is acheckbox for Overwrite. If that box is checked, the current database content is discardedand a fresh data set is loaded as it is discovered when the Agent starts. Otherwise, any newdata is integrated with the existing database as it is discovered.3 - 12CCNA 1: Networking Basics v 3.1 - Lab 7.1.9aCopyright 2003, Cisco Systems, Inc.Notice the hostnames, which areM450, SanJose1 and Thunder, in the example above. PChostnames will be different in student output. Also notice the IP addresses and MAC addresses foreach discovered device. It should be obvious that both SanJose1 and SanJose2 have two IPaddresses assigned to the LAN interface.Notice that NI does not investigate beyond the router interface.
It collects information only on thedevices that share the same broadcast domain as the computer NIC.Step 4 Investigate device propertiesDouble click on the router device name and look over the available Device Properties. Rememberthat results will depend on the devices included in the LANs subnet.The Overview tab in the above graphic shows IP addresses, the IPX address, the IPX networksattached, the IPX data frame used (802.3 above), and the MAC address. Notice that the OUI hasbeen converted to identify the manufacturer in the above example.The closest switches will only appear if Network Inspector has been provided with a valid SNMPCommunity String for them.The Problems tab reveals one of the IP addresses is duplicated within the network.
This occurs ifthe student configured an optional host as defined in Step 1. The red ball to the left of theDescription indicates a problem.4 - 12CCNA 1: Networking Basics v 3.1 - Lab 7.1.9aCopyright 2003, Cisco Systems, Inc.The Services tab reveals the IP and IPX Services running on the routers.The IP Services example in the graphic above reveals that the IP HTTP Server service has beenturned on. This means the router can be accessed via a Web browser.The IPX Services shows the IPX Network ID (30), the Node address (MAC), the frame type, and thefact that IPX RIP is running.The bottom third of the window shows the information that would have been revealed if the devicehad been a Novell Server. A multi-homed server, which is one with more than one NIC (connection)in separate networks, is working as a router or bridge.The MIB SNMP tab reveals SNMP information as well as the router IOS information.5 - 12CCNA 1: Networking Basics v 3.1 - Lab 7.1.9aCopyright 2003, Cisco Systems, Inc.The Switch Inspector tab creates a variety of charts of the switch interface data for the selecteddevice.
This data is not collected during the initial 10-minute period. The Switch Inspector testprovides basic utilization graphs for any SNMP enabled device. The level of information offered bythis test depends on which MIBs are supported by the selected device. For example, sinceSanJose1 is a router, the student cannot display the address of any directly connected devices for ahighlighted port.
The buttons on the left side of the window change the chart format. The GraphLegend6 - 12button at the bottom-left corner displays the floating legend seen below.CCNA 1: Networking Basics v 3.1 - Lab 7.1.9aCopyright 2003, Cisco Systems, Inc.The second button is the TabularView, and selecting it details each interface on the selecteddevice including whether the interface is up or down. The check box at the left of each linedetermines whether statistics are gathered for trending on that interface. Scrolling to the right revealsMTU and Description (FastEthernet0/0 or Token-Ring 0/1) details.The two clock-like buttons switch between a one-hour or 24-hour history,which can create an interesting comparison if the NI has been running foran extended time.
The results will be the same in this short exercise.While in the Switch Inspector, the Reports button on the rightside of the screen will expand to show two options. Select theSwitch Performance choice and a multi-page report withvarious charts will appear on the screen. Look over theresults.The Switch Detail option only works with a switch.After looking over the Device Properties window, click on the Close button in the upper right cornerto return to the Network Inspector Console.Step 5 Explore the left panel optionsAt the Network Inspector Console, experiment with expanding and contracting the choices in the leftside pane. As with the Explorer, if an item on the left side is selected, the right side will show thedetails. In the following example, expanding the Problems Log and selecting Errors shows thedevices on the right side with errors.
This makes it easy to spot the duplicate IP address device.Try different options on the left pane and note the result in the right pane. Due to the limited numberof devices, some will be empty. Try it later with a larger sample.7 - 12CCNA 1: Networking Basics v 3.1 - Lab 7.1.9aCopyright 2003, Cisco Systems, Inc.In the left pane, select Devices to show all devices in the right pane. Note the format of the MACaddress.Click on the Options button in the toolbar (or View > Options) and note that the student can choosebetween Manufacturer Prefix and Hex.
Select the one that is not chosen, look over the otheroptions, and then click on OK. Note the result.Getting Help. In the Console main screen, check that the Problem Log is selected, and that adevice shown in the detail window has been highlighted. Press F1, which is the Help function key, toshow a list of problems by category.As an example, one of the problems created by the current Lab configuration in the above graphic isa duplicate IP address. To learn about duplicate IP addresses, what the symptoms are, and whatcan be done about them, select the hyperlink listing for Duplicate IP Address from the list. There isa wealth of information in the Help for this software.Take a minute and experiment with the Preview, Sort, and Reports buttons in the toolbar.
Thefeatures should be obvious. Look particularly at the troubleshooting and documentation possibilitiesof the reports.8 - 12CCNA 1: Networking Basics v 3.1 - Lab 7.1.9aCopyright 2003, Cisco Systems, Inc.Select a host and then open the Toolsbutton in the toolbar and pick Ping.The Select Parameter box will include theLAN IP addresses that the student can ping.Select one and click on OK.A command (MSDOS) window will appearto show the results.Type exit to close the new window whenfinished.Try using the Telnet and Traceroute options. Select a router or switch in the Console display andthen choose Tools | Telnet and a window with a Telnet session open will appear.
Trace works thesame way.The Web option on the Tools button will open a Web session with a device if the IP HTTP Serverfeature is turned on. If trying this, the username is the hostname, which is SanJose1 or SanJose2,and the password is cisco.In the sample lab above, the switch is a Catalyst 1924 with an IP address assigned. Therefore, thefollowing appears if the Web choice is selected while the switch is highlighted:Experiment with the above toolbar options until comfortable with the features.Step 6 Use Net Map and Visio to diagram the networkIf Visio is installed on the workstation, the Net Map button on the toolbar will activate Visio andcreate a network map of the broadcast domain.
The following example uses the “Router Connectionsin a Switched Network” on the Net Map button. It will draw the network whether or not a switch isincluded.9 - 12CCNA 1: Networking Basics v 3.1 - Lab 7.1.9aCopyright 2003, Cisco Systems, Inc.The Visio is fully integrated into NI. This means that double clicking one of the devices in the drawingwill call up the Device Properties window that was used in Step 4.Step 7 Document router information.Using the skills covered earlier, select the router and document the following information whereavailable:a.
What is the name of the device? _______________________________________________b. What IP services is the device running? _________________________________________c.What IPX services is the device running? ________________________________________d. What is the SNMP community string? ___________________________________________e. What is the location? _______________________________________________________f.Who is the contact? ________________________________________________________g.
Which interfaces are available? _______________________________________________h. Which interfaces are up? ____________________________________________________10 - 12CCNA 1: Networking Basics v 3.1 - Lab 7.1.9aCopyright 2003, Cisco Systems, Inc.i.List below any problem(s) that the software has discovered.______________________________________________________________________________________________________________________________________________________________________________________________________________________________Step 8 Observe device discoveryIf possible, connect the two switches with a crossover cable and watch the NI output as new devicesare discovered. If a crossover cable is unavailable, remove one of the switches and plug the host(s)and router into the second switch.
While this would not usually be done in a production environment,do it now just to see how NI responds.New devices should show up initially with blue triangles indicating they are newly discovered. Manyshould eventually get a yellow warning rectangle indicating a potential problem. Remember that thisprocess could take 10 or more minutes.Eventually, the other subnets and the second router should be seen.Step 9 Stop the capture and access the Problems and Notification tabsClick on the Agent button in the toolbar. The Agent has been collecting data all this time. Click onthe Stop button and then confirm intentions when prompted.Look over the tabs to see the database options that can be set.
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