HUB
Hub is a central switching device for communication lines is star topology.It is a central switch box that permits multiple network devices connect to a local area network through a single point,
A hub can be a active hub 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
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