300-415 Question #187: Real Exam Question with Answer & Explanation

The correct answer is B: BFD. Bidirectional Forwarding Detection (BFD) is automatically enabled on all IPsec tunnels in Cisco SD-WAN by default. BFD sends hello packets across each tunnel at a configured interval and uses these probes to continuously measure loss, latency, and jitter on every path. When BFD d

WAN Edge Router Deployment

Question

Which protocol is configured on tunnels by default to detect loss, latency, jitter, and path failures in Cisco SD-WAN?

Options

ATLS
BBFD
COMP
DBGP

Explanation

Bidirectional Forwarding Detection (BFD) is automatically enabled on all IPsec tunnels in Cisco SD-WAN by default. BFD sends hello packets across each tunnel at a configured interval and uses these probes to continuously measure loss, latency, and jitter on every path. When BFD detects that a path has exceeded its thresholds or gone down entirely, it reports the failure to the OMP process so traffic can be rerouted. TLS secures control-plane connections, OMP distributes routing information, and BGP is a traditional routing protocol - none of them perform real-time data-plane path health monitoring the way BFD does.

Topics

#Cisco SD-WAN#BFD#Tunnel Monitoring#WAN Edge Routers

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