An alternative to the bus topology is the ring topology.
Don't confuse a physical ring with a logical ring. IBM's Token Ring is an example of a network system that operates as a logical ring, but doesn't look like a ring.
This is due to the fact that all of the PCs in the ring plug into a central device called a Media Access Unit (MAU).
MAUs are similar looking to hubs (discussed later).
The difference is that each computer in the ring takes turns transmitting or receiving data.
This is accomplished using a token. The token is passed from one computer to the next. Only the PC with the token can transmit data
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