CLF-C02 Cloud Technology and Services Practice Question
A company runs hundreds of Amazon EC2 instances for its application. The operations team manually reviews instance utilization metrics once a month to identify instances that are over-provisioned (e.g., using only 10% of CPU) or under-provisioned. They want to automate this analysis and receive rightsizing recommendations to optimize costs and performance. The solution must be natively provided by AWS and must use historical utilization data to generate recommendations. Which AWS service should the company use?
⚠ Common exam trap
Candidates often confuse AWS Trusted Advisor's cost optimization checks with detailed rightsizing recommendations, but Trusted Advisor does not analyze historical utilization data or provide instance-specific rightsizing suggestions like Compute Optimizer does.
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 Compute Optimizer
AWS Compute Optimizer is the correct choice because it is a native AWS service that uses machine learning to analyze historical utilization metrics (such as CPU, memory, and network) across EC2 instances and automatically generates rightsizing recommendations. It specifically identifies over-provisioned and under-provisioned instances to optimize both cost and performance, meeting the requirement for automated analysis based on historical data.
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 Compute Optimizer
Why this is correct
AWS Compute Optimizer is the correct answer because it uses machine learning to analyze historical utilization metrics (such as CPU, memory, network, and EBS I/O) from CloudWatch to detect over-provisioned and under-provisioned EC2 instances. It provides granular, actionable rightsizing recommendations, including instance family, size, and Auto Scaling group adjustments, along with estimated savings. Unlike general cost-analysis or management tools, Compute Optimizer is purpose-built for automated resource optimization, making it the best fit for the company's requirement to reduce compute spend while maintaining performance.
- ✗
AWS Trusted Advisor
Why it's wrong here
Incorrect. AWS Trusted Advisor inspects your AWS environment and makes recommendations in categories like cost optimization, performance, security, and fault tolerance. However, its cost optimization recommendations are generally higher-level (e.g., underutilized instances, reserved instance opportunities) and do not provide the same granular, per-instance rightsizing recommendations that AWS Compute Optimizer offers.
When this WOULD be correct
A company wants a high-level cost optimization check that identifies idle resources or underutilized EC2 instances without needing detailed historical analysis or automated rightsizing recommendations.
- ✗
AWS Cost Explorer
Why it's wrong here
Incorrect. AWS Cost Explorer provides graphs and reports for analyzing your AWS costs and usage over time. It does not generate rightsizing recommendations based on resource utilization. It is a cost analysis tool, not a resource optimization tool.
When this WOULD be correct
A company wants to analyze historical cost and usage data to identify spending trends, forecast future costs, and create custom cost reports. The question asks for a service to visualize and manage AWS costs over time, not for instance rightsizing.
- ✗
AWS Systems Manager
Why it's wrong here
Incorrect. AWS Systems Manager provides a unified interface to manage operational tasks on AWS resources, including patching, automation, and inventory collection. While it can gather utilization data, it does not provide built-in rightsizing recommendations like AWS Compute Optimizer.
When this WOULD be correct
A company needs to automate patching of EC2 instances, run commands across instances, or manage instance configurations centrally. AWS Systems Manager would be the correct service for these operational tasks.
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 Compute OptimizerCorrect answer▾
Why this is correct
AWS Compute Optimizer is the correct answer because it uses machine learning to analyze historical utilization metrics (such as CPU, memory, network, and EBS I/O) from CloudWatch to detect over-provisioned and under-provisioned EC2 instances. It provides granular, actionable rightsizing recommendations, including instance family, size, and Auto Scaling group adjustments, along with estimated savings. Unlike general cost-analysis or management tools, Compute Optimizer is purpose-built for automated resource optimization, making it the best fit for the company's requirement to reduce compute spend while maintaining performance.
✗AWS Trusted AdvisorWrong answer — click to see why▾
Why this is wrong here
AWS Trusted Advisor provides general best-practice checks (e.g., security, cost optimization) but does not generate rightsizing recommendations based on historical utilization data for EC2 instances.
★ When this WOULD be the correct answer
A company wants a high-level cost optimization check that identifies idle resources or underutilized EC2 instances without needing detailed historical analysis or automated rightsizing recommendations.
Why candidates choose this
Candidates may confuse Trusted Advisor's cost optimization checks (e.g., underutilized instances) with the more specialized, data-driven rightsizing recommendations provided by Compute Optimizer.
✗AWS Cost ExplorerWrong answer — click to see why▾
Why this is wrong here
AWS Cost Explorer provides cost and usage data but does not generate rightsizing recommendations based on historical utilization; it focuses on cost analysis, not instance optimization.
★ When this WOULD be the correct answer
A company wants to analyze historical cost and usage data to identify spending trends, forecast future costs, and create custom cost reports. The question asks for a service to visualize and manage AWS costs over time, not for instance rightsizing.
Why candidates choose this
Candidates may confuse Cost Explorer's cost analysis capabilities with Compute Optimizer's rightsizing recommendations, especially since both involve historical data and cost optimization.
✗AWS Systems ManagerWrong answer — click to see why▾
Why this is wrong here
AWS Systems Manager does not provide rightsizing recommendations based on historical utilization data; it focuses on operational management, patching, and automation, not cost optimization analysis.
★ When this WOULD be the correct answer
A company needs to automate patching of EC2 instances, run commands across instances, or manage instance configurations centrally. AWS Systems Manager would be the correct service for these operational tasks.
Why candidates choose this
Candidates may confuse Systems Manager's automation capabilities with the specific need for rightsizing recommendations, assuming it can analyze utilization data when it primarily handles management tasks.
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?”
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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.