Q4 — AWS DVA-C02 Ch.3

Question 4 of 100 | ← Chapter 3

A company wants to migrate its web application to AWS and use Auto Scaling to handle peak workloads. The solution architect determines that the best metric for Auto Scaling is concurrent users. Based on this information, what should developers use to scale based on concurrent users?

• A. An Amazon SNS topic invoked when the concurrent user threshold is met.
• B. The Amazon CloudWatch NetworkIn metric.
• C. Amazon CloudFront with AWS edge locations.
• D. A custom Amazon CloudWatch metric for concurrent users. ✓

Correct Answer: D. A custom Amazon CloudWatch metric for concurrent users.

Explanation

In AWS, to implement Auto Scaling based on a specific metric such as concurrent users, a custom Amazon CloudWatch metric must be used. Amazon SNS topics are primarily for message notifications and cannot directly drive Auto Scaling. The Amazon CloudWatch NetworkIn metric relates to network traffic, not concurrent users. Amazon CloudFront edge locations are used for content distribution and are unrelated to Auto Scaling based on concurrent users. Therefore, Option D is correct: use a custom Amazon CloudWatch metric for concurrent users to enable Auto Scaling.