Which AWS Service Monitors Resources and Applications in Real Time?
Short answer
B Amazon CloudWatch monitors AWS resources and applications in real time by collecting metrics and logs.
Question
Key Takeaways
The question tests the distinction between logging/auditing services and monitoring/metrics services, with the trap being confusion between CloudTrail's audit trails and CloudWatch's performance data.
Amazon CloudWatch is the correct AWS service for real-time monitoring of resources and applications. This page clarifies why CloudWatch is superior to CloudTrail and Trusted Advisor for operational metrics.
Common mistake: AWS CloudTrail (C) is a common wrong answer because it tracks API activity, but it does not provide real-time performance metrics like CPU utilization or latency.
Expert Analysis
Why the Answer Is Correct
Amazon CloudWatch is the primary AWS service designed to collect and track metrics, collect and monitor log files, and set alarms. It provides real-time visibility into the health and performance of AWS resources, including EC2 instances, RDS databases, and Lambda functions. The term "real time" specifically points to CloudWatch's ability to push metrics every minute (or more frequently for detailed monitoring), allowing users to react instantly to changes.
Why the Other Options Are Wrong
AWS CloudTrail (C) records API calls for auditing and compliance purposes; it is not a performance monitoring tool. AWS Trusted Advisor (A) offers best practice checks on cost optimization, security, and fault tolerance, but these are not real-time operational monitors. AWS Cost Explorer (D) is strictly for analyzing historical and forecasted costs, not application or resource performance.
Community Comment Notes
Community consensus strongly supports B, with learners noting that CloudWatch handles logs from various sources like ECS and Lambda. One learner highlighted that CloudWatch enables "real-time monitoring of logs," reinforcing its role as the central observability service.
Official Reference
https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/WhatIsCloudWatch.html
This link opens the official vendor documentation in a new tab.
Exam Strategy
Always associate 'metrics' and 'real-time monitoring' with CloudWatch. Reserve CloudTrail for 'API auditing' and 'compliance', and Reserved Advisor for 'best practices' or 'cost optimization'.
Frequently Asked Questions
Does CloudWatch monitor logs?
Can I use CloudTrail for performance monitoring?
Community Votes
100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.
Discussion 3 contributions
Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.
From public community threads 3
-
Nikmah 👍 1 Answered BAmazon CloudWatch Logs • CloudWatch Logs can collect log from: • Elastic Beanstalk: collection of logs from application • ECS: collection from containers • AWS Lambda: collection from function logs • CloudTrail based on filter • CloudWatch log agents: on EC2 machines or on-premises servers • Route53: Log DNS queries • Enables real-time monitoring of logs
-
PhilipJ 👍 2 Answered BB is correct.
-
d00b229 👍 1B. Amazon CloudWatch
Reader comments & corrections
No reader corrections yet — spotted an error or have a note? Share it below.
Related Analysis
Practice All CLF-C02 Questions
Access 120 questions with complete answers and detailed explanations.
View Full CLF-C02 Practice Test →