- A
AWS IAM Access Analyzer
Correct. AWS IAM Access Analyzer continuously analyzes resource-based policies and reports on resources that are accessible from external entities, including other AWS accounts or public access. It is specifically designed for this use case.
- B
AWS Config
Why wrong: Incorrect. AWS Config evaluates your AWS resource configurations against desired rules and tracks configuration changes over time. While it can be used to detect non-compliant S3 bucket policies, it does not proactively analyze policies for unintended cross-account or public access in the same way as IAM Access Analyzer. Access Analyzer is more targeted for this specific requirement.
- C
AWS Trusted Advisor
Why wrong: Incorrect. AWS Trusted Advisor provides a check for S3 buckets with open access permissions, but it is a point-in-time check that updates periodically, not a continuous, findings-based service. It also does not analyze access from specific external AWS accounts. IAM Access Analyzer offers more granular and continuous detection.
- D
Amazon Macie
Why wrong: Incorrect. Amazon Macie uses machine learning and pattern matching to discover and protect sensitive data within S3 buckets, such as personally identifiable information (PII). It does not analyze resource policies for unintended access permissions. The requirement is about policy analysis, not content inspection.
CLF-C02 Security and Compliance Practice Question
This CLF-C02 practice question tests your understanding of security and compliance. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 stores sensitive customer data in multiple Amazon S3 buckets. The security team wants to proactively identify any buckets that have been configured to allow unintended access from external AWS accounts or from the public internet. The team needs a service that continuously analyzes the resource-based policies attached to these buckets and generates findings when such unintended access is detected. Which AWS service should the security team use to meet this requirement?
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 IAM Access Analyzer
AWS IAM Access Analyzer is the correct service because it continuously analyzes resource-based policies (such as S3 bucket policies) to identify resources that are shared with external AWS accounts or publicly accessible. It generates findings for any policy that grants access to a principal outside of its AWS account, including the 'Principal': '*' condition that allows public internet access. This directly meets the requirement for proactive, continuous monitoring of unintended access.
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 IAM Access Analyzer
Why this is correct
Correct. AWS IAM Access Analyzer continuously analyzes resource-based policies and reports on resources that are accessible from external entities, including other AWS accounts or public access. It is specifically designed for this use case.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
AWS Config
Why it's wrong here
Incorrect. AWS Config evaluates your AWS resource configurations against desired rules and tracks configuration changes over time. While it can be used to detect non-compliant S3 bucket policies, it does not proactively analyze policies for unintended cross-account or public access in the same way as IAM Access Analyzer. Access Analyzer is more targeted for this specific requirement.
- ✗
AWS Trusted Advisor
Why it's wrong here
Incorrect. AWS Trusted Advisor provides a check for S3 buckets with open access permissions, but it is a point-in-time check that updates periodically, not a continuous, findings-based service. It also does not analyze access from specific external AWS accounts. IAM Access Analyzer offers more granular and continuous detection.
When this WOULD be correct
A company wants a one-time review of their AWS account to identify cost optimization opportunities, performance improvements, security gaps (like public S3 buckets), and service limits. AWS Trusted Advisor would be the correct service for this advisory assessment.
- ✗
Amazon Macie
Why it's wrong here
Incorrect. Amazon Macie uses machine learning and pattern matching to discover and protect sensitive data within S3 buckets, such as personally identifiable information (PII). It does not analyze resource policies for unintended access permissions. The requirement is about policy analysis, not content inspection.
When this WOULD be correct
A company needs to automatically discover and classify sensitive data (e.g., PII, financial data) stored in S3 buckets and monitor for data leaks or policy violations. Macie would be the correct service to use.
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 IAM Access AnalyzerCorrect answer▾
Why this is correct
Correct. AWS IAM Access Analyzer continuously analyzes resource-based policies and reports on resources that are accessible from external entities, including other AWS accounts or public access. It is specifically designed for this use case.
✗AWS Trusted AdvisorWrong answer — click to see why▾
Why this is wrong here
AWS Trusted Advisor checks S3 bucket permissions for public access but does not continuously analyze resource-based policies for unintended access from external AWS accounts; it only provides a point-in-time check for public access.
★ When this WOULD be the correct answer
A company wants a one-time review of their AWS account to identify cost optimization opportunities, performance improvements, security gaps (like public S3 buckets), and service limits. AWS Trusted Advisor would be the correct service for this advisory assessment.
Why candidates choose this
Candidates may confuse Trusted Advisor's security checks for S3 bucket public access with the continuous, policy-based analysis needed for unintended access from external accounts, assuming it covers all access scenarios.
✗Amazon MacieWrong answer — click to see why▾
Why this is wrong here
Amazon Macie is designed to discover and protect sensitive data using machine learning and pattern matching, not to analyze resource-based policies for unintended access from external accounts or the public internet.
★ When this WOULD be the correct answer
A company needs to automatically discover and classify sensitive data (e.g., PII, financial data) stored in S3 buckets and monitor for data leaks or policy violations. Macie would be the correct service to use.
Why candidates choose this
Candidates may associate Macie with S3 security and data protection, mistakenly thinking it also handles policy analysis for unintended access.
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?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse AWS Config's ability to monitor resource configurations with IAM Access Analyzer's specific purpose of analyzing resource-based policies for cross-account and public access, leading them to choose Config when the requirement explicitly mentions 'resource-based policies' and 'unintended access from external AWS accounts or the public internet.'
Detailed technical explanation
How to think about this question
IAM Access Analyzer uses a policy analysis engine that evaluates the effective permissions of resource-based policies by simulating requests from external principals. It supports custom policy checks and can analyze S3 bucket policies, SQS queue policies, KMS key policies, and more. A subtle behavior is that it only generates findings for policies that explicitly grant access to external principals—it does not flag policies that rely on identity-based policies (e.g., IAM roles) because those are not resource-based.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
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 |
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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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: AWS IAM Access Analyzer — AWS IAM Access Analyzer is the correct service because it continuously analyzes resource-based policies (such as S3 bucket policies) to identify resources that are shared with external AWS accounts or publicly accessible. It generates findings for any policy that grants access to a principal outside of its AWS account, including the 'Principal': '*' condition that allows public internet access. This directly meets the requirement for proactive, continuous monitoring of unintended access.
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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