- A
Write a bucket policy that grants access to the partner account's IAM role.
Bucket policy can grant cross-account access securely.
- B
Generate presigned URLs and share them with the partner.
Why wrong: Presigned URLs are temporary and require ongoing generation.
- C
Make the bucket publicly readable.
Why wrong: Public access is not secure.
- D
Create an IAM user with access keys and share them with the partner.
Why wrong: Sharing access keys is insecure.
Question 740 of 1,786
DEA-C01 S3 Bucket Policy Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 needs to share a dataset stored in an S3 bucket with a partner AWS account. The partner should be able to read the data without needing to authenticate with the engineer's account. The engineer must not share any secret keys. Which approach should be used?
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 bucket policy that grants access to the partner account's IAM role.
Option A is correct because S3 bucket policies can grant cross-account access to a specific IAM role in the partner account, allowing the partner to read data without authentication or shared secrets. Option B is wrong because presigned URLs are temporary and require ongoing generation for each access, not a persistent solution. Option C is wrong because making the bucket public violates security principles and exposes data to everyone. Option D is wrong because sharing access keys is insecure and against best practices; keys should never be shared.
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.
- ✓
Write a bucket policy that grants access to the partner account's IAM role.
Why this is correct
Bucket policy can grant cross-account access securely.
Related concept
S3 Bucket Policy
- ✗
Generate presigned URLs and share them with the partner.
Why it's wrong here
Presigned URLs are temporary and require ongoing generation.
- ✗
Make the bucket publicly readable.
Why it's wrong here
Public access is not secure.
- ✗
Create an IAM user with access keys and share them with the partner.
Why it's wrong here
Sharing access keys is insecure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often confuse presigned URLs with a secure long-term solution, but they are temporary and not suitable for persistent cross-account access.
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
- Cross-Account Access
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.
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.
- →
Data Security and Governance — study guide chapter
Learn the concepts, then practise the questions
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Data Security and Governance practice questions
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Security and Governance — This question tests Data Security and Governance — S3 Bucket Policy.
What is the correct answer to this question?
The correct answer is: Write a bucket policy that grants access to the partner account's IAM role. — Option A is correct because S3 bucket policies can grant cross-account access to a specific IAM role in the partner account, allowing the partner to read data without authentication or shared secrets. Option B is wrong because presigned URLs are temporary and require ongoing generation for each access, not a persistent solution. Option C is wrong because making the bucket public violates security principles and exposes data to everyone. Option D is wrong because sharing access keys is insecure and against best practices; keys should never be shared.
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.
What is the key concept behind this question?
S3 Bucket Policy
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Last reviewed: Jun 20, 2026
This DEA-C01 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 DEA-C01 exam.
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