AWS Certified Solutions Architect Associate SAA-C03 Practice Question
A company hosts its web application in two AWS Regions. The business requires that if the application endpoint in the primary Region becomes unreachable, users must automatically be redirected to the standby Region without manual intervention. Which solution meets this requirement with the LEAST operational overhead?
Configure Amazon Route 53 health checks and a failover routing policy that points to the secondary Region when the primary endpoint becomes unhealthy.
Create an Application Load Balancer that spans both Regions and enable cross-Region load balancing.
Use an Amazon CloudFront distribution with the two regional Application Load Balancer origins and configure origin failover.
Deploy AWS Global Accelerator with endpoint groups in each Region and manually adjust the traffic dials during an outage.
Amazon Route 53 combines health checks with a failover routing policy to implement DNS failover. When the primary record becomes unhealthy, Route 53 automatically responds with the standby record, redirecting users to the secondary Region without additional operator action. Application Load Balancers cannot span multiple Regions. AWS Global Accelerator can shift traffic but requires more configuration and (in this scenario) manual traffic-dial changes. CloudFront origin failover is designed mainly for CDN use cases and does not provide Region-level DNS failover with the same simplicity. Therefore, Route 53 failover is the best fit.
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