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Which principle applies to diagnosing any network complaint?

  • A.Start with power and earth before the protocol
  • B.Start with the fault codes, which identify the fault directly and therefore make any other check unnecessary
  • C.Start with the gateway
  • D.Establish that every module has a sound supply and earth before considering the communication itself at all

Answer: A

Most communication faults are supply, earth or wiring rather than protocol. The last option states that discipline explicitly, which makes it a correct and more emphatic version of the same principle. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. Naming what changes and what stays the same is the reliable route through questions of this shape. Tracing the requirement back to the physical constraint that produces it makes the answer follow.

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