- A
AWS Budgets
Why wrong: Budgets sends alerts when thresholds are crossed but doesn't provide the analytical drill-down capability to identify which resource caused a spike.
- B
AWS Cost Explorer
Cost Explorer lets customers filter and group costs by service, resource, and time to pinpoint exactly which service caused an unexpected cost increase.
- C
AWS Pricing Calculator
Why wrong: Pricing Calculator estimates future costs — it doesn't analyze historical actual costs.
- D
AWS Trusted Advisor
Why wrong: Trusted Advisor identifies optimization opportunities proactively — it doesn't help analyze the cause of a past billing spike.
Question 664 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.
A company received an unexpected AWS bill that was much higher than expected. Which AWS service would help them understand which resource or service caused the cost spike?
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 Cost Explorer
AWS Cost Explorer (B) is the correct service because it provides a pre-built dashboard and reports that allow you to visualize, analyze, and drill down into your AWS costs and usage over time. You can filter by service, linked account, region, or resource tags to identify exactly which resource or service caused the unexpected cost spike. AWS Budgets (A) can alert you when costs exceed a threshold, but it does not provide the historical analysis and granular breakdown needed to pinpoint the root cause of a past spike.
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 Budgets
Why it's wrong here
Budgets sends alerts when thresholds are crossed but doesn't provide the analytical drill-down capability to identify which resource caused a spike.
- ✓
AWS Cost Explorer
Why this is correct
Cost Explorer lets customers filter and group costs by service, resource, and time to pinpoint exactly which service caused an unexpected cost increase.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Pricing Calculator
Why it's wrong here
Pricing Calculator estimates future costs — it doesn't analyze historical actual costs.
- ✗
AWS Trusted Advisor
Why it's wrong here
Trusted Advisor identifies optimization opportunities proactively — it doesn't help analyze the cause of a past billing spike.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse AWS Budgets (a proactive alerting tool) with AWS Cost Explorer (a reactive analysis tool), mistakenly thinking that setting a budget will help them understand the cause of a past spike, when in fact budgets only alert on future thresholds and do not provide historical drill-down capabilities.
Detailed technical explanation
How to think about this question
AWS Cost Explorer uses an in-memory data store to aggregate and index cost and usage data from AWS Cost and Usage Reports (CUR), enabling sub-second query response times for complex filters and group-by operations. It supports granularity down to the hour and can break down costs by resource-level tags, which is essential for identifying a specific EC2 instance or RDS database that caused a spike. In a real-world scenario, a developer might launch a large, on-demand GPU instance for a test and forget to terminate it, causing a cost spike that Cost Explorer can isolate by filtering on instance type and usage hours.
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 Cost Explorer — AWS Cost Explorer (B) is the correct service because it provides a pre-built dashboard and reports that allow you to visualize, analyze, and drill down into your AWS costs and usage over time. You can filter by service, linked account, region, or resource tags to identify exactly which resource or service caused the unexpected cost spike. AWS Budgets (A) can alert you when costs exceed a threshold, but it does not provide the historical analysis and granular breakdown needed to pinpoint the root cause of a past spike.
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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