SAP-C02 Question 496
Select 2A financial services company runs a mission-critical trading application on Amazon EC2 instances behind an Application Load Balancer (ALB). The application is deployed across two Availability Zones in a single AWS Region. The company wants to ensure high availability and resiliency for the application. Additionally, the application must continue to operate seamlessly even if an entire Region becomes unavailable. Which solution should you implement to meet these requirements?
- A
Deploy the application in a second AWS Region using the same setup and configure Route 53 for DNS failover with health checks.
- B
Enable Multi-AZ deployments for the Application Load Balancer to ensure traffic is routed to healthy targets across Availability Zones.
- C
Configure an Amazon S3 bucket with cross-Region replication to back up application data and use it to restore the application in the event of a failure.
- D
Use AWS Global Accelerator to route user traffic to the nearest healthy Region during a Regional failure.
- E
Implement an Amazon RDS Multi-AZ database for the application in the current Region to improve availability.
Show answer and explanation
Correct answers: A, D
Explanation
To achieve high availability and resiliency, the application must be deployed across multiple AWS Regions and have mechanisms to route traffic to a healthy Region during a failure. Deploying the application in a second Region and using Route 53 with health checks ensures traffic is redirected when a Region fails. Additionally, AWS Global Accelerator provides low-latency routing and seamless failover, further enhancing the solution's resiliency.
- A. Correct.
Correct. Deploying the application in a second AWS Region and configuring Route 53 with health checks ensures high availability and resiliency across Regions. Route 53 will route traffic to the second Region if the primary Region becomes unavailable.
- B. Incorrect.
Incorrect. While enabling Multi-AZ for the Application Load Balancer ensures availability across Availability Zones, it does not provide resiliency in the event of a Regional failure.
- C. Incorrect.
Incorrect. Although cross-Region replication for Amazon S3 provides a backup solution for data, it does not directly address high availability or seamless failover for the application itself.
- D. Correct.
Correct. AWS Global Accelerator enables routing user traffic to the nearest healthy Region, ensuring seamless failover and minimizing downtime during a Regional failure.
- E. Incorrect.
Incorrect. While Amazon RDS Multi-AZ improves database availability within a Region, it does not address the need for application resiliency across multiple Regions.