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Which effect does a module that fails to sleep have on the network?

  • A.It holds the network in an active state, so every other module remains powered and the battery discharges overnight
  • B.It keeps the bus awake and drains the battery
  • C.It disconnects itself from the network, which prevents any further communication with that module until it is reset
  • D.No effect

Answer: B

One module that will not sleep keeps the whole network powered and flattens the battery in days. The last option describes exactly that mechanism, which makes it a correct and fuller version of the same answer. Naming what changes and what stays the same is the reliable route through questions of this shape. The shared behaviour explains why these belong together and the differences explain why both exist. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision.

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