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The scheme by which the node with the lowest identifier wins access to a controller area network without corrupting its message is called _____.

  • A.non destructive bitwise arbitration
  • B.master and slave polling, which is instead the scheme used by a local interconnect network within the vehicle
  • C.time triggered scheduling
  • D.collision detection with random backoff, which discards both messages and requires each node to retransmit later

Answer: A

Nodes monitor the bus while transmitting and the loser withdraws the moment it sees a dominant bit where it sent a recessive one. The winner's message proceeds uninterrupted, which is what makes the scheme non destructive. Naming what changes and what stays the same is the reliable route through questions of this shape. Most errors here come from carrying across a result from a neighbouring case where it does not hold. The shared properties explain why these belong to one family, and the differences explain why more than one exists.

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