SAP-C02 Question 477
Select 3A company is running a business-critical application on a fleet of Amazon EC2 instances behind an Application Load Balancer (ALB). The application stores its data in an Amazon RDS database. The company wants to improve the reliability of its infrastructure to ensure high availability and disaster recovery across multiple AWS Regions. Which combination of actions should the Solutions Architect recommend?
- A
Enable cross-Region replication for the Amazon RDS database and configure a read replica in the secondary Region.
- B
Deploy the Amazon EC2 instances and ALB in an Auto Scaling group spanning multiple Availability Zones in the primary Region.
- C
Use an Amazon Route 53 latency-based routing policy to direct traffic between Regions.
- D
Migrate the database to Amazon DynamoDB and enable global tables to replicate across Regions.
- E
Configure an Amazon S3 bucket with cross-Region replication to back up the application logs and data.
Show answer and explanation
Correct answers: A, B, C
Explanation
To improve high availability and disaster recovery for the application, the architecture should span multiple Regions and Availability Zones. Cross-Region replication for RDS ensures the availability of the database in the secondary Region. Deploying EC2 instances and ALB across multiple Availability Zones ensures fault tolerance in the primary Region. Using Route 53 latency-based routing ensures that traffic is routed efficiently and provides failover capabilities between Regions. Migrating to DynamoDB and configuring S3 cross-Region replication are not directly aligned with the stated requirements for improving reliability of the current infrastructure.
- A. Correct.
Enabling cross-Region replication for Amazon RDS and setting up a read replica in the secondary Region ensures database availability in the event of a Regional failure.
- B. Correct.
Deploying the EC2 instances and ALB in an Auto Scaling group across multiple Availability Zones enhances fault tolerance within the primary Region.
- C. Correct.
Using Amazon Route 53 latency-based routing ensures traffic is directed to the closest or healthiest Region, improving failover capabilities.
- D. Incorrect.
Migrating to DynamoDB with global tables is not necessary for this use case, as the application is already using Amazon RDS and the requirement is to enhance reliability, not migrate the database.
- E. Incorrect.
Configuring an S3 bucket with cross-Region replication is useful for backing up logs and data but does not directly address the application's high availability or failover requirements.