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A network switch or a hub is a computer networking device that connects network segments.

From Wikipedia: A network switch or a hub is a computer networking device that connects network segments.

An Ethernet hub is a repeater which repeats the incoming transmission from one (active) port on all other ports. Unlike a switch it does not do smart things.

An Ethernet switch is smarter. It initially acts like a hub, but it learns the MAC adresses present on each port. Once it knows the matching MAC address it only repeats the data to the correct port. Thus leaving other ports free for communication.

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