An application runs on Amazon EC2 instances in an Auto Scaling group. The application experiences unpredictable traffic spikes. The solutions architect wants to ensure that the average CPU utilization of the instances stays around 50%. Which scaling policy should be used?

Answer options:

Simple scaling policy

Step scaling policy

Target tracking scaling policy

Scheduled scaling policy

How to approach this question

When a specific metric value (like '50% CPU') needs to be maintained, Target Tracking is the correct answer.

Full Answer

C.Target tracking scaling policy✓ Correct

With target tracking scaling policies, you select a scaling metric and set a target value. Amazon EC2 Auto Scaling creates and manages the CloudWatch alarms that trigger the scaling policy and calculates the scaling adjustment based on the metric and the target value.

Common mistakes

Choosing Simple or Step scaling, which require more manual configuration and don't automatically target a specific metric value.

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