AWS Certified SysOps Administrator – Associate — Question 146

A company has an application that is deployed to two AWS Regions in an active-passive configuration. The application runs on Amazon EC2 instances behind an Application Load Balancer (ALB) in each Region. The instances are in an Amazon EC2 Auto Scaling group in each Region. The application uses an Amazon Route 53 hosted zone for DNS. A SysOps administrator needs to configure automatic failover to the secondary Region.

What should the SysOps administrator do to meet these requirements?

Answer options

• A. Configure Route 53 alias records that point to each ALB. Choose a failover routing policy. Set Evaluate Target Health to Yes.
• B. Configure CNAME records that point to each ALChoose a failover routing policy. Set Evaluate Target Health to Yes.
• C. Configure Elastic Load Balancing (ELB) health checks for the Auto Scaling group. Add a target group to the ALB in the primary Region. Include the EC2 instances in the secondary Region as targets.
• D. Configure EC2 health checks for the Auto Scaling group. Add a target group to the ALB in the primary Region. Include the EC2 instances in the secondary Region as targets.

Correct answer: A

Explanation

The correct answer is A because configuring Route 53 with alias records and a failover routing policy allows for automatic failover based on health checks. Option B is incorrect as CNAME records are not suitable for this use case. Options C and D do not provide a direct method for DNS-level failover and rely on Elastic Load Balancing health checks, which do not replace the need for Route 53's failover capabilities.