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HUB

Hub is a central switching device for communication lines in star topology. It is a central switch box that permits multiple network devices ( client computers or workstations) to connect to a local area network through a single point. A hub can be a active or a passive hub. A passive hub adds nothing to the transmission except switching function. Where as a hub may contain necessary electronics that regenerate signals to boost strength as well monitor activity. Such hubs are known as intelligent hubs or Active hubs.

Hubs may be added to bus topologies, for example a hub can turn an Ethernet network into a star topology to improve trouble shooting.

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