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AWS Certified Advanced Networking - Specialty · AWS
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Configuring Bidirectional Forwarding Detection (BFD) on the Direct Connect connections on the on-premises router will provide the largest reduction in the BGP failover time. BFD is a protocol that enables rapid detection of link or session failures, allowing for faster convergence and faster traffic rerouting. By configuring BFD on the on-premises router, the company can reduce the failover time from minutes to seconds, improving the resiliency of their critical VPC workloads that connect to the on-premises data center through the redundant active-passive AWS Direct Connect connections.
You can configure Bidirectional Forwarding Detection (BFD) on your network. Asynchronous BFD is automatically enabled for each AWS Direct Connect virtual interface. It's automatically enabled for Direct Connect virtual interfaces, but does not take effect until you configure it on your router.
D is correct