CLF-C02 Billing, Pricing, and Support Practice Question
Which AWS service provides recommendations to help reduce costs, such as identifying idle EC2 instances, underutilized EBS volumes, and unassociated Elastic IPs?
⚠ Common exam trap
Candidates often confuse AWS Cost Explorer (which shows cost data) with Trusted Advisor (which provides actionable recommendations), leading them to choose Cost Explorer because it sounds cost-related, but it lacks the specific idle resource detection logic.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
AWS Trusted Advisor
AWS Trusted Advisor is the correct service because it provides automated cost optimization recommendations by analyzing your AWS environment. It specifically identifies idle EC2 instances, underutilized EBS volumes, and unassociated Elastic IPs, which are common sources of wasted spend. These checks are part of the cost optimization category within Trusted Advisor, and they help you reduce costs by right-sizing or releasing unused resources.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
AWS Cost Explorer
Why it's wrong here
AWS Cost Explorer is a cost analysis service that visualizes historical and forecasted spending, with dashboards, filters, and grouping by tags, services, or accounts. It does include a limited right-sizing recommendation feature—primarily for EC2 instances—based on CloudWatch utilization data, but that is only one dimension of cost management. Trusted Advisor's cost checks span far more services and also cover security, fault tolerance, and performance, giving a broader and more actionable best-practice audit. For this question, Cost Explorer is the wrong answer because its focus is spending analytics rather than comprehensive compliance checks.
- ✓
AWS Trusted Advisor
Why this is correct
AWS Trusted Advisor is an automated service that evaluates your AWS environment against best-practice checks across cost optimization, security, fault tolerance, performance, and service limits. For cost, it specifically detects idle and underutilized resources such as EC2 instances, EBS volumes, RDS databases, and load balancers, then recommends concrete actions like rightsizing, terminating, or purchasing Reserved Instances and Savings Plans. This makes it the correct tool because it proactively surfaces optimization opportunities for existing deployed workloads.
- ✗
Amazon CloudWatch
Why it's wrong here
Amazon CloudWatch is a monitoring and observability service that collects metrics, logs, and events, and can send alerts when thresholds are exceeded, such as high CPU utilization or billing anomalies. However, it does not analyze your resource configurations or usage patterns to recommend cost-optimization actions; it merely presents raw operational data. You would need to manually interpret CloudWatch metrics to identify idle resources, whereas Trusted Advisor does that automatically. Therefore, CloudWatch is the wrong choice because it lacks built-in best-practice recommendations.
- ✗
AWS Pricing Calculator
Why it's wrong here
AWS Pricing Calculator is intended for estimating the monthly cost of a planned architecture before you build it, by allowing you to select services, regions, and expected usage inputs. It does not scan or analyze your existing deployed resources, nor does it have visibility into your current account utilization or idle capacity. Because it is a forward-looking quote tool rather than a backward-looking assessment tool, it cannot provide optimization guidance for resources already running in your environment. Hence, it is incorrect for this scenario.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CLF-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CLF-C02 exam.