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Which principle should govern replacing a module on a network?

  • A.Confirm the supply, the earth, the bus wiring and the connector before concluding that the module itself has failed
  • B.Prove the module is at fault before replacing it
  • C.Replace the module named in the fault code, which is the fastest route to a repair in the majority of cases
  • D.Replace the gateway first

Answer: B

Supply, earth, wiring and connector account for most communication faults. The last option lists exactly those checks, which makes it a correct and more practical version of the same principle. Checking which component actually carries the load settles most questions of this kind at once. The order in which the effects act is what decides the outcome, so it is worth establishing first. Reading the definition literally, rather than recalling a summary, avoids the usual confusion.

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