Chapter 4 Troubleshooting Answers
1. The most likely cause is electromagnetic interference (EMI). EMI is interference that
emanates from an electrical device. Since the fluorescent light is an electrical device with
a strong magnetic field, that magnetic field is probably disrupting network
communications on the wires that are lying across it.
2. When connecting two network devices together, such as two hubs or two computers
containing network interface cards, a crossover configuration must be used. In order to
make a crossover cable, you must change the pin-out connections on one end of the
cable. Note that this change must be made on only one end; otherwise you have
essentially made a regular data cable that has a nonstandard pin connection.