Question #799
Which AWS service enables automatic failover between resources in different Regions using health checks and DNS routing to maintain application availability?
Amazon Route 53
Elastic Load Balancing
AWS Config
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