Designing Cisco Network Service Architectures (ARCH, legacy) — Question 45

An ISP is offering two MPLS circuits to an office when one of the links fails. Which routing feature provides the fastest possible convergence to the failover link?

Answer options

• A. BFD
• B. UDLD
• C. TTL
• D. multipath A

Correct answer:

Explanation

Bidirectional Forwarding Detection (BFD) is designed for rapid detection of link failures, allowing for quick failover to backup links. UDLD is used for detecting unidirectional links, while TTL is a time limit for packet lifespan, neither of which directly aid in quick failover. Multipath A does not specifically address convergence speed in the event of a link failure.