Troubleshooting techniques are critical for today’s networks, and network technicians need to recognize and repair problems as fast as possible. The variety of data traversing the network is quite different today than it was a few years back. With the addition of Voice and Video applications understanding the most overlooked causes of trouble in Cisco Networks will aid in correcting most problems quickly and easily. This white paper is a guide to the top ten causes of trouble in a Cisco network and how to address them, but is not intended to be a troubleshooting guide.