Which of the following descriptions of BFD detection characteristics is incorrect?

Question

Options

• AReduce application interruption time and improve network reliability
• BEstablish a session between the two devices to monitor the bidirectional forwarding path
• CProvide a detection time of less than 1 second to speed up network convergence
• DFault detection can only be performed on the bidirectional forwarding path of the directly

• A
  4% (1)
• B
  4% (1)
• C
  12% (3)
• D
  80% (20)

Explanation

Option D is incorrect because BFD (Bidirectional Forwarding Detection) is not limited to directly connected devices - it also supports multi-hop BFD (RFC 5883), allowing fault detection across non-adjacent paths such as multi-hop IP routes. Options A, B, and C are all accurate: BFD does reduce downtime and improve reliability (A), works by establishing a bidirectional control session between two endpoints (B), and achieves sub-second detection times in the millisecond range, far faster than traditional routing protocol convergence (C).

Memory tip: Think of the word "only" in option D as your red flag - BFD is designed to be flexible across both single-hop and multi-hop environments, so any statement saying it can "only" work on direct links is a giveaway that it's wrong.

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