Repeaters connect multiple network segments together. They amplify the incoming signal received from one segment and send it on to all other attached segments. This allows the distance limitations of network cabling to be extended. There are limits on the number of repeaters which can be used. The repeaters counts as a single node in the maximum node count associated with the Ethernet standard.
Repeaters also allow isolator of segments in the event of failures or fault conditions. Disconnecting one side of a repeaters effectively isolates the associated segments from the network. Using repeaters simply allows extending the network distance limitations.
It should be noted that the network number assigned to the main network segment and the network number assigned to the other side of the repeater are the same. In addition, the traffic generated on one segment is propagated onto the other segment. This causes a rise in the total amount of traffic, so if the network segments are already heavily loaded, it is not a good idea to use a repeater.
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