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Troubleshooting Network Performance
If your network runs slower than it used to run (or slower than it ought to run), the problem might be that the present network traffic exceeds the level at which the network can operate efficiently. Some possible causes for increased traffic are new hardware (such as a new workstation) or new software (such as a network computer game or some other network application). A generator or another mechanical device operating near the network could cause a degradation of network performance. In addition, a malfunctioning network device could act as a bottleneck. Ask yourself what has changed since the last time the network operated efficiently, and begin there with your troubleshooting efforts.

Some of the techniques described in previous chapters can help you troubleshoot network performance. A performance monitoring tool, such as Windows NT’s Performance Monitor, can help you look for bottlenecks that are adversely affecting your network. See Chapter 12 for more information on Performance Monitor.

The monitoring and record-keeping procedures discussed in Chapter 12 also can help you troubleshoot network performance by providing you with baseline performance data that you can use to gauge later fluctuations.

For instance, the increased traffic could be the result of increased usage. If usage exceeds the capacity of the network, you might want to consider expanding or redesigning your network. You also might want to divide the network into smaller segments by using a router or a bridge to reduce network traffic. A protocol analyzer can help you measure and monitor the traffic at various points on your network.