SAP-C02 Question 495
Select 2A company is designing a mission-critical application that requires high availability and resiliency. The application backend will run on Amazon EC2 instances, and the database will use Amazon RDS for MySQL. The application must tolerate the failure of an entire AWS Region while ensuring minimal downtime. Which combination of solutions should the company implement to meet these requirements?
- A
Deploy the EC2 instances in an Auto Scaling group spanning multiple Regions.
- B
Use Amazon RDS Multi-AZ deployments with a read replica in another Region.
- C
Configure Route 53 with latency-based routing and health checks for the application endpoints in each Region.
- D
Deploy the EC2 instances in an Auto Scaling group spanning multiple Availability Zones within a single Region.
- E
Use Amazon RDS Multi-AZ deployments within a single Region.
Show answer and explanation
Correct answers: B, C
Explanation
To achieve high availability and resiliency across Regions, the application backend must be designed to tolerate the failure of an entire AWS Region. Using Amazon RDS Multi-AZ deployments with a read replica in another Region ensures database redundancy across Regions. Additionally, Route 53 latency-based routing with health checks allows traffic to automatically failover to a healthy Region in the event of a Regional outage. This combination satisfies the requirement for high availability and resiliency with minimal downtime.
- A. Incorrect.
Incorrect: Auto Scaling groups cannot span multiple Regions. To achieve multi-Region redundancy, separate deployments in each Region are required.
- B. Correct.
Correct: Amazon RDS Multi-AZ deployments with a read replica in another Region ensure high availability within the primary Region and provide a backup in case of a Regional failure.
- C. Correct.
Correct: Route 53 latency-based routing ensures that users are directed to the Region with the least latency, and health checks can automatically failover traffic to a healthy Region in case of a Regional outage.
- D. Incorrect.
Incorrect: Deploying EC2 instances in an Auto Scaling group across multiple Availability Zones provides high availability only within a single Region, but it does not protect against Regional failures.
- E. Incorrect.
Incorrect: Amazon RDS Multi-AZ deployments within a single Region provide high availability only within that Region, but they do not protect against Regional failures.