An application consists of an Auto Scaling group of EC2 instances behind an ALB. During a traffic spike, the instances are reaching 100% CPU, but the Auto Scaling group is not adding more instances quickly enough. Which configuration change would improve responsiveness?

Direct Answer (Verified)Reviewed by Sunny (Senior Cloud Engineer)

Correct Answer: Decrease the scaling cooldown period and adjust the alarm threshold

The cooldown period prevents the ASG from launching more instances before the previous one has taken the load. Decreasing it or using a more sensitive alarm helps scaling out faste...

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Real Exam ScenarioAmazon EC2

An application consists of an Auto Scaling group of EC2 instances behind an ALB. During a traffic spike, the instances are reaching 100% CPU, but the Auto Scaling group is not adding more instances quickly enough. Which configuration change would improve responsiveness?

✓ Correct Answer & ExplanationAmazon EC2

Correct Answer

Decrease the scaling cooldown period and adjust the alarm threshold

Why This Answer Is Correct

The cooldown period prevents the ASG from launching more instances before the previous one has taken the load. Decreasing it or using a more sensitive alarm helps scaling out faster.

📚 What This Question Tests

This question evaluates your knowledge of Amazon EC2 — a core concept tested in AWS Certified Solutions Architect – Associate (SAA-C03). Understanding Amazon EC2 is essential for designing scalable, secure, and cost-effective cloud architectures. Mastery of this topic will help you answer scenario-based questions confidently on exam day.