Implementing Cisco Enterprise Advanced Routing and Services (ENARSI) — Question 108

What is an advantage of using BFD?

Answer options

• A. It detects local link failure at layer 1 and updates the routing table.
• B. It detects local link failure at layer 3 and updates the routing protocols.
• C. It has sub-second failure detection for layer 1 and layer 3 problems.
• D. It has sub-second failure detection for layer 1 and layer 2 problems.

Correct answer: D

Explanation

The correct answer, D, highlights BFD's capability to detect failures quickly at both layer 1 and layer 2, which is crucial for maintaining network reliability. Option A is incorrect as it only addresses layer 1 and routing tables, while B focuses solely on layer 3, missing layer 1 detection. Option C does not mention layer 2, which is a key aspect of BFD's functionality.