Implementing Cisco Service Provider Advanced Routing Solutions (SPRI) — Question 101

An engineer configured OSPF on all routers in the data center in the same exchange as other routers. Layer 2 connectivity was established. Now, the engineer plans to implement BFD to detect failures in the forwarding path. Which action must the engineer take?

Answer options

• A. Configure IS-IS routing before implementing BFD.
• B. Configure BFD between each adjacent router.
• C. Configure BFD on any one of the routers.
• D. Configure CEF before implementing BFD.

Correct answer: D

Explanation

The correct answer is D, as Cisco Express Forwarding (CEF) must be enabled for BFD to function effectively, allowing for rapid failure detection. Option A is incorrect because IS-IS routing is not a prerequisite for BFD. Option B is not necessary since BFD can be configured in a way that doesn’t require it between each adjacent router. Option C is wrong because BFD needs to be configured on each router for proper end-to-end monitoring.