AWS Certified Solutions Architect – Associate (SAA-C02) — Question 469

A company designed a stateless two-tier application that uses Amazon EC2 in a single Availability Zone and an Amazon RDS Multi-AZ DB instance. New company management wants to ensure the application is highly available.
What should a solutions architect do to meet this requirement?

Answer options

• A. Configure the application to use Multi-AZ EC2 Auto Scaling and create an Application Load Balancer.
• B. Configure the application to take snapshots of the EC2 instances and send them to a different AWS Region.
• C. Configure the application to use Amazon Route 53 latency-based routing to feed requests to the application.
• D. Configure Amazon Route 53 rules to handle incoming requests and create a Multi-AZ Application Load Balancer.

Correct answer: A

Explanation

To make the stateless web tier highly available, the Amazon EC2 instances must be distributed across multiple Availability Zones using an Auto Scaling group, with traffic managed by an Application Load Balancer. Option B is a disaster recovery backup strategy rather than a high availability solution. Options C and D are incorrect because Route 53 routing cannot resolve the single Availability Zone vulnerability of the underlying EC2 instances without a multi-AZ compute setup.