If you have a network connectivity problem, you will be unable to reach any network resource that can normally be accessed using the failed network. For example, if your Internet connection has failed, you will be unable to access Internet resources, but you might still be able to access resources on your LAN. If your LAN fails, however, nothing will be accessible. Most network connectivity problems result from one of the following issues: Troubleshoot Your Network
Failed network adapter
Failed network hardware
Failed network connection
Faulty network cables
Misconfigured network hardware
Misconfigured network adapter
Note Often, people jump to the conclusion that the network has failed when only a single network resource has failed. For example, a failed DNS server will stop your computer from resolving host names, which would prevent the computer from finding resources on the network by name. Similarly, if the only network resource a user accesses is her e-mail server and that server has failed, the failure might appear to that user to be a total loss of connectivity. To avoid spending time troubleshooting the wrong problem, the processes in this tutorial always start by isolating the cause of the problem.
After you isolate the failed feature, you can work to resolve that specific problem or you can escalate the problem to the correct support team. For example, if you determine that the network adapter has failed, you will need to contact the hardware manufacturer for a replacement part. If you determine that the Internet connection has failed, you will need to contact your ISP. To isolate the cause of a network connectivity problem
Failed network adapter
Failed network hardware
Failed network connection
Faulty network cables
Misconfigured network hardware
Misconfigured network adapter
Note Often, people jump to the conclusion that the network has failed when only a single network resource has failed. For example, a failed DNS server will stop your computer from resolving host names, which would prevent the computer from finding resources on the network by name. Similarly, if the only network resource a user accesses is her e-mail server and that server has failed, the failure might appear to that user to be a total loss of connectivity. To avoid spending time troubleshooting the wrong problem, the processes in this tutorial always start by isolating the cause of the problem.
After you isolate the failed feature, you can work to resolve that specific problem or you can escalate the problem to the correct support team. For example, if you determine that the network adapter has failed, you will need to contact the hardware manufacturer for a replacement part. If you determine that the Internet connection has failed, you will need to contact your ISP. To isolate the cause of a network connectivity problem
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