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 ink?

Question

Options

• ABFD
• BUDLD
• CTTL
• Dmultipath

• A
  5% (1)
• B
  81% (17)
• C
  10% (2)
• D
  5% (1)

Explanation

NOTE: The marked answer (B - UDLD) appears to be incorrect based on standard networking principles. UDLD (Unidirectional Link Detection) is a Layer 2 Cisco protocol that detects one-way Ethernet links but does not drive routing convergence. The correct answer for fastest MPLS failover convergence is BFD (Bidirectional Forwarding Detection) - option A. BFD provides sub-second link failure detection between adjacent forwarding engines and integrates directly with routing protocols to trigger rapid reconvergence when a link fails. Multipath (D) can distribute traffic across both links but does not improve convergence speed on its own. TTL (C) is a packet field, not a convergence mechanism. If this question appears on a live exam, BFD (A) is the technically accurate answer.

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