For single-arm BFD detection modes, in ____ mode, the local end sends BFD control packets according to a certain transmission cycle. The detection location is the remote end. The remote end detects…

Question

Options

• Aasynchronous
• Bsynchronous
• Cstatic
• Ddynamic

• A
  73% (24)
• B
  9% (3)
• C
  15% (5)
• D
  3% (1)

Explanation

In asynchronous mode, BFD endpoints continuously transmit control packets at a configured interval without waiting for any acknowledgment trigger, so the remote end serves as the detection point by monitoring whether those periodic packets keep arriving. Option B (synchronous) is not a defined BFD operational mode - BFD's two standard modes are asynchronous and demand, so "synchronous" is a fabricated distractor. Option C (static) describes how a BFD session is created (manually configured rather than protocol-triggered), not how packets are transmitted or failures detected. Option D (dynamic) similarly refers to session establishment method, not a detection mode.

Memory tip: Think "Async = Always transmitting" - in asynchronous mode, the local end never stops sending; the remote end catches a failure when the stream goes silent.

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