SAP-C02 Question 178
Select 3Your company runs a mission-critical web application on AWS that must maintain 99.99% availability. The application is currently deployed in a single AWS Region using an Auto Scaling group behind an Application Load Balancer (ALB). To ensure business continuity in the event of a regional failure, how should you redesign the architecture?
- A
Deploy the application in a second Region and configure Route 53 with a failover routing policy.
- B
Enable cross-Region replication for the underlying Amazon RDS database and update the application to use the secondary database in case of failover.
- C
Use Amazon S3 Cross-Region Replication for static assets and update the application to serve these assets from the secondary Region.
- D
Implement AWS Global Accelerator to automatically route traffic to the nearest healthy Region.
- E
Set up a single Amazon CloudFront distribution to serve content globally, eliminating the need for multi-Region deployment.
Show answer and explanation
Correct answers: A, B, C
Explanation
To ensure business continuity, the solution requires deploying the application in multiple Regions, replicating data and static assets across Regions, and configuring failover mechanisms. This approach ensures high availability and minimal downtime during a regional failure. AWS Global Accelerator and CloudFront are valuable services but do not directly address the core requirements for disaster recovery and failover.
- A. Correct.
Deploying the application in a second Region and configuring Route 53 with a failover routing policy allows traffic to failover to the secondary Region in case of a regional failure, ensuring business continuity.
- B. Correct.
Cross-Region replication for RDS ensures that the secondary Region has an up-to-date database copy that the application can failover to, maintaining data consistency and availability.
- C. Correct.
Using S3 Cross-Region Replication ensures that static assets are available in both Regions, which is critical for user experience during a failover scenario.
- D. Incorrect.
AWS Global Accelerator provides global traffic routing but does not specifically handle business continuity during a regional failure, as it focuses on improving performance and availability for multi-Region applications.
- E. Incorrect.
CloudFront improves content delivery performance but does not eliminate the need for multi-Region deployment for business continuity in case of a regional failure.