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The distance that a LAN can cover is limited
due to attenuation. Attenuation means that the signal weakens as it
travels through the network. The resistance in the cable or medium
through which the signal travels causes the loss of signal strength. An
Ethernet repeater is a physical layer device on the network that boosts
or regenerates the signal on an Ethernet LAN. When a repeater is used to
extend the distance of a LAN, a single network can cover a greater
distance and more users can share that same network. However, the use of
repeaters and hubs compounds problems associated with broadcasts and collisions. It
also has a negative effect on the overall performance of the shared
media LAN. 
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