1) It has multiple input/output (I/O) ports, in which a signal introduced at the input of any port appears at the output of every port except the original incoming.
2) A hub works at the physical layer (layer 1) of the OSI model
3) There's 2 kinds of hub, Passive & Active (which needs adapter & it'll repeat the signals)
Ref.:
http://en.wikipedia.org/wiki/Ethernet_hub
http://www.definethecloud.net/data-center-101-local-area-network-switching/
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