CCDE: Cisco Certified Design Expert (Practical) — Question 160

Company XYZ is running a redundant private WAN network using OSPF as the underlay protocol. The current design accommodates for redundancy in the network, but it is taking over 30 seconds for the network to reconverge upon failure. Which technique can be implemented in the design to detect such a failure in a subsecond?

Answer options

• A. fate sharing
• B. OSPF LFA
• C. flex links
• D. STP
• E. BFD

Correct answer: E

Explanation

The correct answer is BFD, which stands for Bidirectional Forwarding Detection, and it allows for rapid detection of link failures in less than a second. The other options, while relevant to network design and redundancy, do not provide the same level of quick failure detection necessary to improve reconvergence times.