- A
Enable S3 server-side encryption on all buckets
Why wrong: Encryption protects data at rest from unauthorized physical access — it doesn't prevent public exposure via misconfigured bucket policies.
- B
Enable S3 Block Public Access at the account level and use AWS Config to detect violations
Account-level Block Public Access prevents any bucket from being made public (overrides all bucket policies/ACLs), while Config provides ongoing compliance monitoring to detect any policy drift.
- C
Enable S3 versioning on all buckets
Why wrong: S3 versioning preserves deleted and overwritten objects — it doesn't control public access permissions.
- D
Enable S3 Transfer Acceleration for all buckets
Why wrong: Transfer Acceleration improves upload speed from geographically dispersed clients — it has no effect on access permissions.
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 recently migrated to AWS and needs to ensure their S3 buckets are not publicly accessible. Which combination of controls best prevents accidental public S3 exposure?
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
Enable S3 Block Public Access at the account level and use AWS Config to detect violations
Option B is correct because S3 Block Public Access at the account level provides a centralized, enforceable guardrail that prevents any bucket or object from being made publicly accessible, overriding any bucket-level policies or ACLs. AWS Config can then continuously monitor for configuration violations, such as a bucket policy that grants public access, and trigger remediation or alerts. Together, these controls create a defense-in-depth approach that both prevents accidental exposure and detects non-compliance.
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.
- ✗
Enable S3 server-side encryption on all buckets
Why it's wrong here
Encryption protects data at rest from unauthorized physical access — it doesn't prevent public exposure via misconfigured bucket policies.
- ✓
Enable S3 Block Public Access at the account level and use AWS Config to detect violations
Why this is correct
Account-level Block Public Access prevents any bucket from being made public (overrides all bucket policies/ACLs), while Config provides ongoing compliance monitoring to detect any policy drift.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable S3 versioning on all buckets
Why it's wrong here
S3 versioning preserves deleted and overwritten objects — it doesn't control public access permissions.
- ✗
Enable S3 Transfer Acceleration for all buckets
Why it's wrong here
Transfer Acceleration improves upload speed from geographically dispersed clients — it has no effect on access permissions.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse data protection features (encryption, versioning, acceleration) with access control mechanisms, leading them to select options that secure data in transit or at rest but do not prevent public exposure.
Detailed technical explanation
How to think about this question
S3 Block Public Access at the account level applies four settings: BlockPublicAcls, IgnorePublicAcls, BlockPublicPolicy, and RestrictPublicBuckets. These settings are evaluated before any bucket policy or ACL, effectively nullifying any attempt to grant public access. AWS Config rules, such as s3-bucket-public-read-prohibited and s3-bucket-public-write-prohibited, can evaluate bucket policies and ACLs against the desired state and trigger automatic remediation via AWS Systems Manager Automation or Lambda functions.
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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Security and Compliance — study guide chapter
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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: Enable S3 Block Public Access at the account level and use AWS Config to detect violations — Option B is correct because S3 Block Public Access at the account level provides a centralized, enforceable guardrail that prevents any bucket or object from being made publicly accessible, overriding any bucket-level policies or ACLs. AWS Config can then continuously monitor for configuration violations, such as a bucket policy that grants public access, and trigger remediation or alerts. Together, these controls create a defense-in-depth approach that both prevents accidental exposure and detects non-compliance.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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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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