AWS Certified SysOps Administrator – Associate (legacy) — Question 519

A web application runs on Amazon EC2 instances behind an ELB Application Load Balancer. The instances run in an EC2 Auto Scaling group across multiple
Availability Zones. Amazon Route 53 is used for DNS and points to the load balancer. A SysOps Administrator has launched a new Auto Scaling group with a new version of the application, and wants to gradually shift traffic to the new version.
How can this be accomplished?

Answer options

• A. Create an Auto Scaling target tracking scaling policy to gradually move traffic from the old version to the new one
• B. Change the Application Load Balancer to a Network Load Balancer, then add both Auto Scaling groups as targets
• C. Use an Amazon Route 53 weighted routing policy to gradually move traffic from the old version to the new one
• D. Deploy Amazon Redshift to gradually move traffic from the old version to the new one using a set of predefined values

Correct answer: A

Explanation

Utilizing an Auto Scaling target tracking scaling policy allows the new environment to automatically adjust its capacity as traffic begins to transition, ensuring resource availability matches demand. Replacing the Application Load Balancer with a Network Load Balancer is unnecessary and adds architectural complexity, while Amazon Redshift is a data warehousing service and cannot be used for traffic routing.