AWS Certified Cloud Practitioner / Question #799 of 719

Question #799

Which AWS service enables automatic failover between resources in different Regions using health checks and DNS routing to maintain application availability?

A

Amazon Route 53

B

Elastic Load Balancing

C

AWS Config

D

Amazon CloudFront

Explanation

Amazon Route 53 (A) is AWS's DNS service that supports DNS routing and health checks to enable automatic failover across Regions. It uses routing policies like Failover Routing to direct traffic to a secondary resource (e.g., in another Region) if the primary resource becomes unhealthy.

Why other options are incorrect:
- B. Elastic Load Balancing (ELB): Distributes traffic within a single Region but does not handle cross-Region failover via DNS.
- C. AWS Config: Monitors resource configurations and compliance, unrelated to routing or failover.
- D. Amazon CloudFront: A CDN that caches content at edge locations but does not manage DNS-based failover between Regions.

Key Points:
- Route 53 uses health checks to monitor endpoints and triggers DNS rerouting during failures.
- Failover Routing is critical for multi-Region disaster recovery architectures.
- DNS-based routing is essential for global application availability.

Answer

The correct answer is: A