Star network
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A star network topology, in its simplest form, consists of one central, or hub computer which acts as a router to transmit messages between connected computers by a store-and-forward or switching system. A heirarchical extension of the star topology allows each node connected by a hub to in turn play the role of a hub for a disjoint set of leaf nodes. In this case mutiple routes may exist between any two given nodes of the network.