CLF-C02 Billing, Pricing, and Support Practice Question
A company is planning to migrate a legacy application to AWS. The solutions architect needs to estimate the monthly cost of running Amazon EC2 instances, Amazon RDS databases, and Amazon S3 storage. The architect wants to compare different instance types, storage classes, and pricing models (e.g., On-Demand vs. Reserved Instances) to find the most cost-effective configuration. The team requires a tool that provides a detailed, itemized cost estimate without incurring any actual charges, and allows saving and sharing the estimate with stakeholders. Which AWS tool should the solutions architect use?
⚠ Common exam trap
Many candidates confuse tools that analyze past costs (Cost Explorer, Cost and Usage Report) with tools that estimate future costs (Pricing Calculator), leading candidates to pick Cost Explorer because it also shows cost breakdowns, but it cannot model a greenfield migration without historical data.
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 Pricing Calculator
The AWS Pricing Calculator (formerly AWS Simple Monthly Calculator) is the correct tool because it allows users to build a detailed, itemized cost estimate for AWS services like EC2, RDS, and S3 without incurring any actual charges. It supports comparing different instance types, storage classes, and pricing models (On-Demand vs. Reserved Instances), and provides a shareable link to save and share the estimate with stakeholders.
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 monitoring and alerting service that tracks actual and forecasted cost and usage against thresholds you set, triggering actions like SNS notifications or IAM policy enforcement when limits are crossed. It does not synthesize upfront price estimates for a not-yet-deployed architecture; it operates only after spend begins accruing or after historical usage patterns exist. While it helps control costs post-migration, it cannot answer 'what will this planned migration cost?' with a per-service breakdown.
When this WOULD be correct
A solutions architect needs to set a monthly cost threshold for an existing AWS account and receive notifications when spending approaches or exceeds the budget.
- ✗
AWS Cost Explorer
Why it's wrong here
AWS Cost Explorer retrieves actual billing and usage data already recorded in the AWS Cost and Usage Report, presenting interactive graphs that let you filter by service, region, or tag. It can generate forecasts by extrapolating historical trends, but it has no ability to model a hypothetical greenfield architecture where no usage data exists yet. Consequently, it is a post-hoc analytical tool, not a pre-migration estimator, and will return empty or misleading results for an unbuilt environment.
When this WOULD be correct
A solutions architect needs to analyze past EC2 usage patterns to identify cost-saving opportunities, such as rightsizing instances or purchasing Reserved Instances based on historical data.
- ✓
AWS Pricing Calculator
Why this is correct
The AWS Pricing Calculator is specifically built to create cost estimates for planned AWS usage. Users can configure services, select pricing models, and receive a detailed monthly estimate. Estimates can be saved, shared, and refined without any actual spend.
- ✗
AWS Cost and Usage Report
Why it's wrong here
The AWS Cost and Usage Report (CUR) is a raw, machine-readable dataset delivered to Amazon S3, containing line-item billing records for every account, service, and operation that was actually consumed. It contains no forward-looking pricing logic and no bill-of-materials calculator; you would have to join it with external data and make manual assumptions to guess at future costs. It is therefore the authoritative ledger of incurred cost, not a planning calculator for an unbuilt environment.
When this WOULD be correct
A solutions architect needs to analyze historical cost and usage data for an existing AWS environment to identify cost-saving opportunities, such as rightsizing EC2 instances or identifying underutilized resources. The tool must provide granular, hourly-level data for custom reports.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The CLF-C02 exam frequently reuses these exact scenarios with slightly different constraints.
✓AWS Pricing CalculatorCorrect answer▾
Why this is correct
The AWS Pricing Calculator is specifically built to create cost estimates for planned AWS usage. Users can configure services, select pricing models, and receive a detailed monthly estimate. Estimates can be saved, shared, and refined without any actual spend.
✗AWS BudgetsWrong answer — click to see why▾
Why this is wrong here
AWS Budgets is used to set spending limits and receive alerts, not to generate detailed, itemized cost estimates for comparing configurations before incurring charges.
★ When this WOULD be the correct answer
A solutions architect needs to set a monthly cost threshold for an existing AWS account and receive notifications when spending approaches or exceeds the budget.
Why candidates choose this
Candidates may confuse budgeting with cost estimation, thinking that a tool named 'Budgets' can provide cost estimates for future usage.
✗AWS Cost ExplorerWrong answer — click to see why▾
Why this is wrong here
AWS Cost Explorer analyzes historical costs and usage, but does not provide upfront cost estimates for planned configurations without incurring actual charges.
★ When this WOULD be the correct answer
A solutions architect needs to analyze past EC2 usage patterns to identify cost-saving opportunities, such as rightsizing instances or purchasing Reserved Instances based on historical data.
Why candidates choose this
Candidates may confuse Cost Explorer's cost analysis capabilities with the ability to estimate future costs, not realizing it requires existing usage data.
✗AWS Cost and Usage ReportWrong answer — click to see why▾
Why this is wrong here
AWS Cost and Usage Report provides detailed billing data after charges have been incurred, not a pre-migration cost estimate without actual charges. It cannot compare instance types or pricing models before deployment.
★ When this WOULD be the correct answer
A solutions architect needs to analyze historical cost and usage data for an existing AWS environment to identify cost-saving opportunities, such as rightsizing EC2 instances or identifying underutilized resources. The tool must provide granular, hourly-level data for custom reports.
Why candidates choose this
Candidates may confuse 'cost estimate' with 'cost reporting' and think that a detailed report would help estimate costs, not realizing that the report only shows past incurred costs, not future projections.
Analysis generated from the official CLF-C02blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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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.