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Which symptom does a babbling node produce?

  • A.No symptom
  • B.Excessive traffic from one module, which loads the bus and causes communication faults to be reported by others
  • C.Bus traffic so heavy that other messages cannot get through
  • D.No traffic at all, since the faulty node holds the bus in the dominant state and therefore blocks every message

Answer: C

A module transmitting continuously starves the others of bandwidth. Holding the bus dominant genuinely is another failure mode that stops everything, which makes the second option a real and distinct fault. Naming what changes and what stays the same is the reliable route through questions of this shape. The shared behaviour explains why these belong together and the differences explain why both exist. Most errors here come from carrying a result across from a neighbouring case where it does not hold.

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