3. Token bus = Token bus is a network implementing the token ring protocol over a "virtual ring" on a coaxial cable . A token is passed around the network nodes and only the node possessing the token may transmit. If a node doesn't have anything to send, the token is passed on to the next node on the virtual ring. Each node must know the address of its neighbour in the ring, so a special protocol is needed to notify the other nodes of connections to, and disconnections from, the ring .
![Image result for tokenbus](data:image/png;base64,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)
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