A multi-tier application runs six front-end web servers in an Amazon EC2 Auto Scaling group in a single Availability Zone behind an Application Load Balancer (ALB). A solutions architect must make the infrastructure highly available without modifying the application. Which architecture provides high availability?
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Correct answer: Modify the Auto Scaling group to use three instances across each of two Availability Zones..
Why this is the answer
The correct answer ensures high availability by distributing instances across multiple Availability Zones (AZs). If one AZ experiences an outage, the application remains operational using instances in the other AZ. The Auto Scaling group will automatically maintain the desired instance count across the specified AZs. Creating an Auto Scaling group across two Regions is incorrect because the application is currently running in a single Region
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