300-440 Question 42
Single answerA network engineer is tasked with implementing Bidirectional Forwarding Detection (BFD) to improve failure detection times in an OSPF environment. The goal is to ensure that BFD operates efficiently by matching its timers with the OSPF hello and dead interval timers. Which statement about configuring BFD for this purpose is correct?
- A
BFD operates independently of OSPF timers and does not require adjustments to align with them.
- B
BFD can be configured to match OSPF hello and dead timers to ensure a consistent failure detection mechanism.
- C
OSPF timers override BFD timers, so BFD configuration is unnecessary when OSPF is already configured.
- D
BFD must be configured globally on all routers in the network to function with OSPF.
Show answer and explanation
Correct answer: B
Explanation
Bidirectional Forwarding Detection (BFD) is a lightweight protocol designed to provide rapid failure detection for routing protocols, including OSPF. While it operates independently of OSPF, it can be configured to complement OSPF timers for faster convergence. By aligning BFD timers appropriately with OSPF timers, network engineers can achieve consistent and efficient failure detection. This ensures that BFD enhances OSPF's ability to detect and respond to failures quickly, without unnecessary global configuration.
- A. Incorrect.
Incorrect: BFD is not independent of OSPF timers when used in conjunction with OSPF. BFD can be tuned to provide faster failure detection than the default OSPF timers.
- B. Correct.
Correct: BFD can be configured to match or complement OSPF timers, providing a faster and more consistent failure detection mechanism.
- C. Incorrect.
Incorrect: OSPF timers do not override BFD timers. Instead, BFD operates alongside OSPF to enhance failure detection beyond the standard OSPF timer mechanisms.
- D. Incorrect.
Incorrect: BFD does not need to be configured globally on all routers. It can be enabled on individual interfaces or specific neighbors where failure detection is required.