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Which identifier lengths does the standard define?

  • A.Only eleven bit
  • B.A base format using eleven bits and an extended format using twenty nine, which permits many more distinct messages
  • C.Eleven bit standard and twenty nine bit extended
  • D.Eight bit and sixteen bit, which correspond to the two frame formats defined by the standard for the network

Answer: C

Eleven bits give just over two thousand identifiers and twenty nine bits give hundreds of millions. The last option states both formats and their purpose, which makes it a correct and fuller version. The shared behaviour explains why these belong together and the differences explain why both exist. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. The quantity that varies and the quantity that does not are worth naming before any substitution is attempted.

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