Troubleshooting Strategy

How do you know when you are having a network problem? The answer to this question depends on your site's network configuration and on your network's normal behavior. See"Knowing Your Network" for more information.
If you notice changes on your network, ask the following questions:

• Is the change expected or unusual?
• Has this event ever occurred before?
• Does the change involve a device or network path for which you already have a backup solution in place?
• Does the change interfere with vital network operations?
• Does the change affect one or many devices or network paths?

       After you have an idea of how the change is affecting your network, you can categorize it as critical or noncritical. Both of these categories need resolution (except for changes that are one-time occurrences); the difference between the categories is the time that you have to fix the problem.

       By using a strategy for network troubleshooting, you can approach a problem methodically and resolve it with minimal disruption to network users. It is also important to have an accurate and detailed map of your current network environment. Beyond that, a good approach to problem resolution is:

• Understanding the Problem
• Recognizing Symptoms
• Identifying and Testing the Cause of the Problem
• Solving the Problem