In cisco SD_WAN, which protocol is used to measure link quality?

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In cisco SD_WAN, which protocol is used to measure link quality?
A . OMP
B. BFD
C. RSVP
D. IPsec

Answer: B

Explanation:

The BFD (Bidirectional Forwarding Detection) is a protocol that detects link failures as part of the Cisco SD-WAN (Viptela) high availability solution, is enabled by default on all vEdge routers, and you cannot disable it.