AWS Certified Solutions Architect – Associate (SAA-C02) — Question 238

A company hosts its application in the AWS Cloud. The application runs on Amazon EC2 instances behind an Elastic Load Balancer in an Auto Scaling group and with an Amazon DynamoDB table. The company wants to ensure the application can be made available in another AWS Region with minimal downtime.
What should a solutions architect do to meet these requirements with the LEAST amount of downtime?

Answer options

• A. Create an Auto Scaling group and a load balancer in the disaster recovery Region. Configure the DynamoDB table as a global table. Configure DNS failover to point to the new disaster recovery Region's load balancer.
• B. Create an AWS CloudFormation template to create EC2 instances, load balancers, and DynamoDB tables to be executed when needed. Configure DNS failover to point to the new disaster recovery Region's load balancer.
• C. Create an AWS CloudFormation template to create EC2 instances and a load balancer to be executed when needed. Configure the DynamoDB table as a global table. Configure DNS failover to point to the new disaster recovery Region's load balancer.
• D. Create an Auto Scaling group and load balancer in the disaster recovery Region. Configure the DynamoDB table as a global table. Create an Amazon CloudWatch alarm to trigger and AWS Lambda function that updates Amazon Route 53 pointing to the disaster recovery load balancer.

Correct answer: A

Explanation

Option A is correct because it involves setting up an Auto Scaling group and load balancer in the disaster recovery Region while configuring the DynamoDB table as a global table, ensuring minimal downtime. Options B and C do not prioritize the use of a global DynamoDB table, which is crucial for maintaining data availability. Option D, while it includes a CloudWatch alarm, adds unnecessary complexity with the Lambda function instead of a straightforward DNS failover setup.