DEA-C01 Data Security and Governance Practice Question
A multinational corporation uses AWS Organizations to manage multiple accounts. The data engineering team has a central data lake account that stores all data in S3. The security team requires that all cross-account access to the data lake be logged and that any access from outside the organization be blocked. The team has enabled S3 server access logs and AWS CloudTrail. However, they notice that some requests from an external AWS account are still able to read data from the data lake. The bucket policy currently allows cross-account access to a specific partner account for data exchange. What additional step should the team take to block access from all other external accounts?
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
✓
Add a Deny statement to the bucket policy that denies access to any principal not in the organization or the partner account.
To block access from all external accounts except the allowed partner, you can add a Deny statement with a condition that checks if the account is not in the organization and not the partner account. Option A is wrong because disabling cross-account access would block the partner. Option B is wrong because the bucket policy already allows the partner. Option D is wrong because S3 Access Points do not inherently block external accounts unless explicitly configured.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Add a condition to the existing Allow statement to require that the source account be in the organization.
Why it's wrong here
Would block the partner who is not in the org.
- ✗
Remove the cross-account access statement from the bucket policy.
Why it's wrong here
Would block the partner as well.
- ✓
Add a Deny statement to the bucket policy that denies access to any principal not in the organization or the partner account.
Why this is correct
Blocks all external accounts except the partner.
- ✗
Use S3 Access Points to restrict access to only the partner account.
Why it's wrong here
Access Points do not automatically block all external accounts.
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 |
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.