- A
Grant full S3 access using a new IAM policy.
Why wrong: Granting full S3 access via a new IAM policy makes permissions even more permissive, which is the opposite of the required restriction. It does not modify the bucket policy.
- B
Write a new bucket policy that denies all actions.
Writing a new bucket policy that denies all actions directly restricts the overly permissive bucket policy. While this may be too restrictive initially, it is the only option that modifies the bucket policy to immediately stop the over-permissive access. You can then add specific allows to maintain required permissions.
- C
Use an S3 blocklist to restrict access.
Why wrong: There is no such feature as an S3 blocklist in AWS. This is not a valid method to restrict access.
- D
Attach the AWS managed policy AmazonS3ReadOnlyAccess to the IAM user.
Why wrong: Attaching the AmazonS3ReadOnlyAccess managed policy to the IAM user does not change the bucket policy. If the bucket policy still grants full access, the user will still have full access despite having a read-only IAM policy. Therefore, this option does not restrict the overly permissive bucket policy.
DEA-C01 S3 bucket policy Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: s3 bucket policy. 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 data engineer notices that an Amazon S3 bucket policy is overly permissive. What is the best practice to restrict access while maintaining required permissions?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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
Write a new bucket policy that denies all actions.
Option B is correct because the bucket policy is overly permissive, so writing a new bucket policy that denies all actions immediately restricts all access. While this may temporarily block required permissions, it is the most direct way to address the bucket policy issue; you can then refine the policy to allow only necessary actions. Option D does not change the bucket policy and thus does not resolve the problem. Option A makes permissions even more permissive. Option C is not a standard AWS feature.
Key principle: S3 bucket policy
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Grant full S3 access using a new IAM policy.
Why it's wrong here
Granting full S3 access via a new IAM policy makes permissions even more permissive, which is the opposite of the required restriction. It does not modify the bucket policy.
- ✓
Write a new bucket policy that denies all actions.
Why this is correct
Writing a new bucket policy that denies all actions directly restricts the overly permissive bucket policy. While this may be too restrictive initially, it is the only option that modifies the bucket policy to immediately stop the over-permissive access. You can then add specific allows to maintain required permissions.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
S3 bucket policy
- ✗
Use an S3 blocklist to restrict access.
Why it's wrong here
There is no such feature as an S3 blocklist in AWS. This is not a valid method to restrict access.
- ✗
Attach the AWS managed policy AmazonS3ReadOnlyAccess to the IAM user.
Why it's wrong here
Attaching the AmazonS3ReadOnlyAccess managed policy to the IAM user does not change the bucket policy. If the bucket policy still grants full access, the user will still have full access despite having a read-only IAM policy. Therefore, this option does not restrict the overly permissive bucket policy.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Do not confuse IAM policies with bucket policies. Attaching an IAM policy to a user does not override an overly permissive bucket policy; both must be considered together.
Detailed technical explanation
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- S3 bucket policy
- Least privilege
- IAM policy
- Explicit deny
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
S3 bucket policy
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.
Visual reference
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.
Review s3 bucket policy, then practise related DEA-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Operations and Support — This question tests Data Operations and Support — S3 bucket policy.
What is the correct answer to this question?
The correct answer is: Write a new bucket policy that denies all actions. — Option B is correct because the bucket policy is overly permissive, so writing a new bucket policy that denies all actions immediately restricts all access. While this may temporarily block required permissions, it is the most direct way to address the bucket policy issue; you can then refine the policy to allow only necessary actions. Option D does not change the bucket policy and thus does not resolve the problem. Option A makes permissions even more permissive. Option C is not a standard AWS feature.
What should I do if I get this DEA-C01 question wrong?
Review s3 bucket policy, then practise related DEA-C01 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
S3 bucket policy
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Last reviewed: Jun 20, 2026
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