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Which field of a frame carries error checking?

  • A.A parity bit, which is appended to the data and permits a single bit error to be detected by the receiving node
  • B.The identifier
  • C.A checksum calculated over the frame, which every receiving node verifies before acknowledging the message received
  • D.A cyclic redundancy check

Answer: D

A fifteen bit cyclic redundancy check protects each frame and every node verifies it. The last option describes that function in general terms, which makes it a correct and equivalent statement of the same answer. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The order in which the effects act is what decides the outcome, so it is worth establishing first. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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