AWS Certified Solutions Architect – Associate (SAA-C03) — Question 580

A company's applications run on Amazon EC2 instances in Auto Scaling groups. The company notices that its applications experience sudden traffic increases on random days of the week. The company wants to maintain application performance during sudden traffic increases.

Which solution will meet these requirements MOST cost-effectively?

Answer options

• A. Use manual scaling to change the size of the Auto Scaling group.
• B. Use predictive scaling to change the size of the Auto Scaling group.
• C. Use dynamic scaling to change the size of the Auto Scaling group.
• D. Use schedule scaling to change the size of the Auto Scaling group.

Correct answer: C

Explanation

Dynamic scaling is the most cost-effective solution because it automatically adjusts the capacity of the Auto Scaling group in real-time response to actual traffic spikes, ensuring performance is maintained only when needed. Scheduled scaling and predictive scaling are ineffective here because the traffic spikes occur on random, unpredictable days, making them impossible to schedule or forecast accurately. Manual scaling is not viable as it requires constant human intervention to react to sudden, unpredictable load changes.