- A
AWS Cost Explorer
Why wrong: Cost Explorer analyzes historical spending trends and provides right-sizing recommendations, but Trusted Advisor provides more comprehensive best-practice checks across multiple dimensions.
- B
AWS Trusted Advisor
Trusted Advisor provides automated best-practice checks and recommendations for cost optimization, including idle resources, underutilized capacity, and savings opportunities.
- C
Amazon CloudWatch
Why wrong: CloudWatch monitors metrics and sends alerts but doesn't proactively recommend cost optimization actions.
- D
AWS Pricing Calculator
Why wrong: Pricing Calculator estimates costs for planned architectures — it doesn't analyze existing deployed resources for optimization opportunities.
Question 420 of 1,024
CLF-C02 Billing, Pricing, and Support Practice Question
This CLF-C02 practice question tests your understanding of billing, pricing, and support. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Which AWS service provides recommendations to help reduce costs, such as identifying idle EC2 instances, underutilized EBS volumes, and unassociated Elastic IPs?
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.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
Cost Explorer analyzes historical spending trends and provides right-sizing recommendations, but Trusted Advisor provides more comprehensive best-practice checks across multiple dimensions.
- ✓
AWS Trusted Advisor
Why this is correct
Trusted Advisor provides automated best-practice checks and recommendations for cost optimization, including idle resources, underutilized capacity, and savings opportunities.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Amazon CloudWatch
Why it's wrong here
CloudWatch monitors metrics and sends alerts but doesn't proactively recommend cost optimization actions.
- ✗
AWS Pricing Calculator
Why it's wrong here
Pricing Calculator estimates costs for planned architectures — it doesn't analyze existing deployed resources for optimization opportunities.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that 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.
Detailed technical explanation
How to think about this question
Under the hood, AWS Trusted Advisor runs automated checks against your account using AWS Config rules and API calls to evaluate resource utilization patterns. For example, the idle EC2 instance check looks at CPU utilization metrics over a 14-day period, flagging instances with average utilization below 1% and maximum below 5%. In a real-world scenario, a company might have dozens of EC2 instances left running from a past project; Trusted Advisor would surface these as idle, potentially saving thousands of dollars monthly by recommending termination or stopping.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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Billing, Pricing, and Support — study guide chapter
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Billing, Pricing, and Support — This question tests Billing, Pricing, and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 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.
What should I do if I get this CLF-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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.
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