In the SDN-WAN solution, what is the detection technology used for TEHSB and VPN FRR protection solutions?

Question

Options

• AEthoam
• BBFD
• CY1731
• DNQA

• A
  5% (2)
• B
  78% (31)
• C
  13% (5)
• D
  5% (2)

Explanation

BFD (Bidirectional Forwarding Detection) is the correct answer because it is a lightweight, protocol-agnostic mechanism specifically designed for rapid link and path failure detection, operating in milliseconds - exactly what TEHSB (Traffic Engineering Hot-Standby) and VPN FRR (Fast ReRoute) protection require to trigger an automatic switchover before traffic loss becomes significant. EthOAM (Option A) is an Ethernet-layer OAM framework focused on connectivity fault management and loopback testing, not sub-second failure detection for IP/MPLS paths. Y.1731 (Option C) is an ITU-T standard layered on top of EthOAM for performance monitoring metrics like delay and jitter, making it a measurement tool rather than a fast-detection trigger. NQA (Option D) is a network quality analysis tool used for probing and testing network performance over time, which is far too slow and passive to serve as the detection mechanism in a real-time protection scheme.

Memory tip: BFD stands for Bidirectional Forwarding Detection - think of it as a "heartbeat in both directions." FRR needs to know instantly when a path dies, and BFD's sole job is to beat fast enough to catch that failure.

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