A web application experiences unpredictable traffic spikes. The architecture uses an Application Load Balancer (ALB) and an Auto Scaling group of EC2 instances. Which TWO configurations will ensure the application scales efficiently and remains highly available? (Select TWO.)

Answer options:

Configure a target tracking scaling policy based on average CPU utilization.

Deploy the Auto Scaling group in a single Availability Zone.

Configure the Auto Scaling group to span multiple Availability Zones.

Use simple scaling policies with a 15-minute cooldown.

Attach an Elastic IP to each EC2 instance.

How to approach this question

Combine a dynamic scaling policy (Target Tracking) with a highly available deployment (Multi-AZ).

Full Answer

To handle unpredictable traffic while maintaining high availability, the Auto Scaling group should span multiple Availability Zones. Target tracking scaling policies are the recommended way to scale based on metrics like CPU utilization.

Common mistakes

Selecting simple scaling policies, which are legacy and less responsive.

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