An application uses Amazon EC2 instances in an Auto Scaling group behind an ALB. During sudden, massive spikes in traffic, the Auto Scaling group takes 5 minutes to launch new instances, during which time the application becomes unresponsive. Which TWO strategies will improve reliability during these spikes? (Select TWO)

Answer options:

Implement Predictive Scaling.

Decrease the health check grace period.

Use a Network Load Balancer instead of an ALB.

Create a custom AMI with all dependencies pre-installed.

Increase the ALB timeout settings.

Use Step Scaling instead of Target Tracking.

How to approach this question

Identify ways to scale proactively and reduce instance boot time.

Full Answer

A, D

Predictive Scaling analyzes historical traffic and scales out before the spike occurs. Creating a custom AMI (baking) removes the need to download and install software during boot, significantly reducing the 5-minute launch time.

Common mistakes

Changing load balancers, which doesn't affect EC2 initialization speed.

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