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Which identifier has the highest priority?

  • A.The numerically lowest
  • B.The numerically highest, which is transmitted first and therefore wins the arbitration against any lower identifier
  • C.Any identifier
  • D.The identifier with the greatest number of dominant bits at the start, which corresponds to the lowest numeric value

Answer: A

Dominant bits represent zero, so the lowest numeric identifier wins. The last option explains exactly why that is so, which makes it a correct and more detailed statement of the same rule. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Most errors here come from carrying across a result from a neighbouring case where it does not hold.

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