AWS Certified Solutions Architect – Associate (SAA-C03) — Question 260

A company has a web application hosted over 10 Amazon EC2 instances with traffic directed by Amazon Route 53. The company occasionally experiences a timeout error when attempting to browse the application. The networking team finds that some DNS queries return IP addresses of unhealthy instances, resulting in the timeout error.

What should a solutions architect implement to overcome these timeout errors?

Answer options

• A. Create a Route 53 simple routing policy record for each EC2 instance. Associate a health check with each record.
• B. Create a Route 53 failover routing policy record for each EC2 instance. Associate a health check with each record.
• C. Create an Amazon CloudFront distribution with EC2 instances as its origin. Associate a health check with the EC2 instances.
• D. Create an Application Load Balancer (ALB) with a health check in front of the EC2 instances. Route to the ALB from Route 53.

Correct answer: D

Explanation

The correct answer is D because using an Application Load Balancer (ALB) allows for automatic health checks of the EC2 instances, ensuring that traffic is only routed to healthy instances. Options A and B do not effectively manage the health of the instances during DNS resolution, which can still lead to timeouts. Option C introduces CloudFront but does not address the underlying issue of unhealthy instances directly affecting traffic flow.