A solutions architect is designing a system to be highly resilient. The system uses Amazon Route 53 with health checks and an Application Load Balancer (ALB). The system is critical and must have…

Question

Options

• AAutomate failover to a healthy resource by automatically updating the value of the Route 53 A
• BConfigure the Route 53 health checks to perform a failover automatically.
• CAutomate failover to a healthy resource by updating the weight of the Route 53 weighted record.
• DCreate a new ALB during a failover event, and remap the target group to the new ALB.

• A
  9% (2)
• B
  86% (19)
• C
  5% (1)

Explanation

Amazon Route 53 health checks can automatically perform DNS failover to healthy endpoints. When integrated with an Application Load Balancer, this provides a highly resilient system architecture that automatically routes traffic to healthy resources across Regions or endpoints. "Route 53 DNS failover automatically routes traffic away from unhealthy resources and directs it to healthy resources that you specify in DNS records." Why B is correct: Route 53 health checks automatically monitor endpoint health and switch to a healthy target when the primary endpoint fails. The failover process is automatic, with no manual updates to DNS records required. Combined with ALB's built-in multi-AZ resilience, this provides maximum availability. Why others are incorrect: A & C: Require manual DNS updates, which are not automatic and introduce latency. D: Creating new ALBs during failover increases downtime and is operationally inefficient.

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