Selected Answer: AC The provided answer is correct: Runs on SD-WAN tunnel to detect failures in the overlay tunnel Is enabled by default and cannot be disabled Is typically enabled for OMP Besides link failures, it also measures latency, loss, and other link statistics used by application-aware routing https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/routing/ios-xe-17/routing-book-xe/m-bfd-for-routing-protocols.html#Cisco_Concept.dita_26cf6354-cce5-4799-b140-f518adc78a40

Selected Answer: C The question doesn't say to pick more than one answer? I chose C.

Totally agree

Selected Answer: AC 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 cannot be disabled. BFD and related parameters: Path liveliness and quality measurement detection protocol: Up/Down, loss/latency/jitter, IPSec tunnel MTU, Runs between all routers in the topology Uses hello (up/down) interval, poll interval, and multiplier for detection

Selected Answer: AC Surprising that Cisco enforces the use of BFD on its SDWAN solution. but A & C are the answers

Selected Answer: C C. It is not asking for more than one option

Selected Answer: AC When I ask ChatGPT and Grok (with the caveat that I add the addendum "choose all that apply") it says A, C, and D are all true. Since the question does not ask how many may be true, I'll probably pick all three if I saw this on a real test A. BFD cannot be turned off on SD-WAN routers. C. Besides link failure detection, it is also used to measure loss and latency used by application aware routing. D. Is not usually enabled for OMP.