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.
D is correct
BFD (Bidirectional Forwarding Detection): is specifically designed for rapid detection of link failures between two forwarding engines, providing fast failure detection and enabling quick convergence in the event of link issues.
BFD is correct
Cisco Catalyst SD-WAN BFD
This type of BFD detects failures in the overlay tunnel and has the following haracteristics:
Is enabled by default and cannot be disabled. Is typically enabled for the Cisco Catalyst SD-WAN Overlay Management Protocol (OMP). Besides link failures, Cisco Catalyst SD-WAN BFD also measures latency, loss, jitter, and other link statistics used by application-aware routing. For more information on Cisco Catalyst SD-WAN BFD for measuring latency, loss, and jitter used by application-aware routing, see https://www.cisco.com/c/en/us/td/docs/routers/sdwan/configuration/policies/ios-xe-17/policies-book-xe/application-aware-routing.html.
https://sdwan-docs.cisco.com/Product_Documentation/Software_Features/SD-WAN_Release_17.1/07Policy_Applications/01Application-Aware_Routing
The Viptela software uses BFD packets to continuously monitor the data traffic on the data plane tunnels between vEdge routers
Application-aware routing uses the BFD Hello packets to measure the loss, latency, and jitter on the links.
D is the correct answer.
The following Cisco SD-WAN capabilities helps to address application performance optimization:
● Application-Aware Routing: Application-aware routing allows the ability to create customized SLA-policies for traffic and measures real-time performance taken by BFD probes
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