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How does a hub work?
A hub is basically a signal splitter; it takes the incoming bits from one port and sends them out to all of the other ports. A eight port hub would receive a packet on one of its ports and send copies out to each of the other seven ports. Each host connect to the hub will view the packet but only the host to which it is addressed will process it. This can cause network traffic problems because a packet addressed to one host is actually sent to all hosts (even though it is only processed by the one it is addressed to).
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