Which of the following statements about passive detection of neighbors is correct? (Multiple choice)

Question

Options

• AAP passively receives neighbor messages to sense the existence of surrounding neighbor APs
• BPassive probing can be used by legitimate APs to collect actual interference between APs
• CPassive detection can be used for legitimate APs to collect interference from illegal APs
• DPassive detection is mainly used to establish the neighbor relationship between legitimate APs

• A
  17% (7)
• B
  76% (31)
• D
  7% (3)

Explanation

B and C are correct because passive detection works by having an AP silently listen on channels without transmitting - essentially performing an RF scan. This makes it ideal for measuring real interference: it captures signals from all transmitters in the environment, whether they are legitimate peer APs (B) or unauthorized/rogue APs (C), since it makes no distinction about the source.

Why A is wrong: Passive detection doesn't rely on receiving specific "neighbor messages" - it simply listens to all radio traffic (e.g., beacon frames, data frames). The phrase "neighbor messages" implies a structured protocol exchange, which is characteristic of active neighbor discovery, not passive scanning.

Why D is wrong: Establishing neighbor relationships between legitimate APs is a goal of active detection methods (e.g., probe request/response exchanges). Passive detection's primary value is interference measurement, not relationship establishment - neighbor topology is a byproduct at best.

Memory tip: Think of passive detection as a spy with headphones - it only listens, never speaks, so it hears everything in the room: both friends (B) and intruders (C). Active detection is like calling out names to find who's there, which is how you formally introduce neighbors (D).

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