CLF-C02 Billing, Pricing, and Support Practice Question
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?
⚠ Common exam trap
Many 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.
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.
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
AWS Budgets is a proactive monitoring tool that alerts you when your actual or forecasted spending reaches a threshold you set, sending notifications via email or CloudWatch alarms. However, it does not offer analytical drill-down views—you cannot filter or group historical spending by service, resource, or tag to pinpoint the root cause of a spike. It simply tells you that a limit was crossed, not which resource did it.
- ✓
AWS Cost Explorer
Why this is correct
AWS Cost Explorer is the correct tool because it lets you visualize and analyze your historical AWS usage and costs over time. You can filter and group data by dimensions such as service, linked account, Region, or resource ID, allowing you to identify exactly which service or resource caused an unexpected cost increase. It also supports custom date ranges and daily/level views, making it ideal for root-cause analysis of a billing spike.
- ✗
AWS Pricing Calculator
Why it's wrong here
AWS Pricing Calculator is a planning tool that estimates the future cost of a proposed AWS architecture based on your assumptions about usage. It has no access to your actual billing or usage history, so it cannot tell you why a past cost spike occurred. It is meant for forecasting and budgeting before resources are deployed, not for diagnosing historical anomalies.
- ✗
AWS Trusted Advisor
Why it's wrong here
AWS Trusted Advisor proactively evaluates your AWS environment against best practices and provides recommendations, including cost optimization checks like idle resources or underutilized Amazon EBS volumes. However, it does not analyze historical billing data or show cost trends over time, and it cannot help you investigate what caused a specific past increase. Its purpose is to suggest ongoing efficiencies, not to explain an unexpected spike after the fact.
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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.