- A
Add a condition to the existing Allow statement to require that the source account be in the organization.
Why wrong: Would block the partner who is not in the org.
- B
Remove the cross-account access statement from the bucket policy.
Why wrong: Would block the partner as well.
- C
Add a Deny statement to the bucket policy that denies access to any principal not in the organization or the partner account.
Blocks all external accounts except the partner.
- D
Use S3 Access Points to restrict access to only the partner account.
Why wrong: Access Points do not automatically block all external accounts.
Question 797 of 1,786
Restrict Cross-Account S3 Access to Only Allowed Partners
This DEA-C01 practice question tests your understanding of data security and governance. 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 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.
Option C is correct. 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.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Related concept
Standard ACLs match source addresses.
- ✗
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.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
- Standard ACLs match source addresses.
- Extended ACLs can match source, destination, protocol and ports.
- The first matching ACL entry is used.
- There is usually an implicit deny at the end.
TExam Day Tips
- Check inbound versus outbound direction.
- Read the ACL from top to bottom.
- Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
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Data Security and Governance — study guide chapter
Learn the concepts, then practise the 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 — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Add a Deny statement to the bucket policy that denies access to any principal not in the organization or the partner account. — Option C is correct. 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.
What should I do if I get this DEA-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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