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A hub is used to connect workstations and peripheral devices to the network, each being plugged into one of the hub's ports. A hub receives a signal from one port and passes the signal on to all of its other ports and therefore to all devices and workstation that are attached to the hub. For example, if an 8-port hub receives a signal on port 4, the hub immediately passes the signal to ports 1, 2, 3, 5, 6, 7 and 8. Hubs are common in Ethernet networks.

A hub is sometimes called a multi-port repeater.

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