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Causes of noise

I would like to know what noise in a network is. Also its causes and perhaps remedies.
Thank you.
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Noise is anthing that disrupts the smooth flow of electrons (or light, if you're using Fibre) down the wire.

Most likely source is badly terminated CAT 5 wire.  Check where the cable enteres the RJ45 connector and make sure that the wires go all the way to the top of connector, and that there is a portion of the sheath underneat the crimp (so that you can't wiggle the cable back and forth in the connector).  Also, make sure that the cable was terminated properly...the second pair of wires should be split around the first pair.

Second most likely source is that someone ran the cable over a flourescnet light, or underneath a monitor, or beside an electric heater, or something like that.  Most inter-office networking is done with Unshielded Twisted Pair wire.  Being unshielded, its somewhat vulnerable to strong EMI (electro-magnetic interference).  The devices I listed above are all big EMI generators.

Also, make sure you're using CAT 5 or Cat 5e wire.  Cat 3 wire or lower won't support 100mb data properly, particularily over longer distances.