Download e-book for kindle: 31 Days Before Your CCENT Certification (Cisco Networking by Scott Bennett

By Scott Bennett

ISBN-10: 1587132176

ISBN-13: 9781587132179

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As mentioned previously, you can approach an issue starting with the layer most likely to be the problem. If you are unfamiliar with the issue and its symptoms, the following bottom-up approach identifies key points to consider in each layer: ■ Physical layer (1): Check power, connectivity, cables, LEDs, and environmental issues such as temperature and humidity. ■ Data link layer (2): Check switch and NIC configurations and operation. Substituting a NIC or switch at this layer often can isolate the issue.

2: Many commands can assist in Layer 3 and upper-layer troubleshooting. The following commands display information about connectivity and configuration on a device: ■ ipconfig shows the IP configuration. ■ ping tests network layer connectivity between devices. ■ tracert tests connectivity and displays each hop. ■ netstat shows any network connections to the device. ■ nslookup queries the configured name server for DNS information. 3: With the OSI reference model as a guide, you can define, isolate, and solve most networkrelated issues.

Bottom up: Start at the physical layer, and work up the OSI model. Many issues with connectivity are caused by a simple problem with a media connection or power to a device. This is a slow mechanical approach that can take time if the issue is with the application. ■ Divide and conquer: Experienced troubleshooters often begin at the layer indicated by the symptoms of a particular problem. This can quickly cut to the center of the issue, but it requires advanced understanding and more experience.

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31 Days Before Your CCENT Certification (Cisco Networking Academy Program) by Scott Bennett

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