DOP-C02 Question #479: Real Exam Question with Answer & Explanation

Question

An ecommerce company hosts a web application on Amazon EC2 instances that are in an Auto Scaling group. The company deploys the application across multiple Availability Zones. Application users are reporting intermittent performance issues with the application. The company enables basic Amazon CloudWatch monitoring for the EC2 instances. The company identifies and implements a fix for the performance issues. After resolving the issues, the company wants to implement a monitoring solution that will quickly alert the company about future performance issues. Which solution will meet this requirement?

Options

• AEnable detailed monitoring for the EC2 instances. Create custom CloudWatch metrics for
• BUse AWS X-Ray to implement distributed tracing. Integrate X-Ray with Amazon CloudWatch
• CUse Amazon CloudFront to deliver the application. Use AWS CloudTrail to monitor API calls. Use
• DEnable VPC Flow Logs. Use Amazon Data Firehose to stream flow logs to Amazon S3. Use

Explanation

To quickly alert about future performance issues, enable detailed monitoring for EC2 instances and create custom CloudWatch metrics for application-specific indicators, then configure alarms.

Common mistakes.

• B. AWS X-Ray is a distributed tracing service excellent for diagnosing bottlenecks within an application's components, but its primary function is not immediate metric-based alerting. Implementing X-Ray often involves more instrumentation effort than enhancing existing CloudWatch metrics for quick alerts.
• C. Amazon CloudFront is a Content Delivery Network (CDN) and AWS CloudTrail records API calls; neither directly provides the granular application performance metrics or quick alerting capabilities needed to monitor for intermittent performance issues on backend EC2 instances.
• D. VPC Flow Logs capture network traffic, which is useful for network troubleshooting and security analysis, but they do not provide direct insight into application-level performance metrics on EC2 instances, making them unsuitable for quickly alerting on application performance issues.

Concept tested. EC2 performance monitoring and alarming

Reference. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-cloudwatch-metrics.html

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