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Which security consideration does a gateway address?

  • A.Encrypting every message, which is required by regulation on every network fitted to a modern vehicle
  • B.None
  • C.Preventing traffic from the diagnostic or infotainment interfaces from reaching the powertrain network directly
  • D.Isolating safety critical networks from external interfaces

Answer: D

Keeping the powertrain bus unreachable from an entertainment or diagnostic connection limits the attack surface. The last option describes exactly that isolation, which makes it a correct and more specific statement. Tracing the requirement back to the physical constraint that produces it makes the answer follow. A symptom that appears under one condition and not another is what narrows the diagnosis quickly. Checking the units of each quantity catches a wrong formula before the arithmetic begins.

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