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Which mechanism prevents a faulty node from disrupting the bus indefinitely?

  • A.Transmit and receive error counters which move the node to a passive state and finally disconnect it from the bus
  • B.Error counters that eventually take the node bus off
  • C.A fuse, which opens if the node draws excessive current and therefore disconnects it from the network entirely
  • D.Nothing

Answer: B

Counters escalate a persistently faulty node to error passive and then bus off, protecting the network. The last option describes exactly that progression, which makes it a correct and more detailed version. Most errors here come from carrying across a result from a neighbouring case where it does not hold. Tracing the requirement back to the physical constraint that produces it makes the answer follow. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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