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Which topology does a local interconnect network use?

  • A.One master polling several slaves
  • B.Multiple masters, each of which may transmit whenever the bus is free and arbitration therefore determines priority
  • C.A ring
  • D.A single master that initiates every message, with slaves responding only when they are addressed by the master

Answer: A

The master sends a header and the addressed slave supplies the data, so no arbitration is needed. The last option describes exactly that scheme, which makes it a correct and fuller statement. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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