4.Troubleshooting
This section is intended to help you solve the most common problems on the
Incorrect connections 
Faulty or loose cables
Look for loose or obviously faulty connections. If they appear to be OK, make sure the connections are snug. If this does not correct the problem, try a different cable.
Non-standard cables
Improper Network Topologies
It is important to make sure that you have a valid network topology. Common topology faults include excessive cable length and too many repeaters (hubs) between end nodes. In addition, you should make sure that your network topology contains no data path loops. Between any two end nodes, there should be only one active cabling path at any given time. Data path loops will cause broadcast storms that will severely impact your network performance.
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