The answer is that the S3 bucket is in a different AWS Region than the Macie session. Amazon Macie operates as a regional service, meaning it can only discover and analyze sensitive data within the same AWS Region where the Macie session is enabled. If the S3 bucket storing PII resides in a separate region, Macie will not generate any sensitive data findings because it cannot scan cross-region buckets by default. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your understanding of Macie’s regional scope and its dependency on bucket location, often appearing as a trap where candidates assume Macie works globally like IAM. A common memory tip is to think of Macie as a “neighborhood watch” that only patrols its own region—if the bucket is in a different neighborhood, it won’t see it. Remember: Macie matches the bucket’s region, not the account’s region.
DEA-C01 Data Security and Governance 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. 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 stores PII in an S3 bucket. The security team wants to use Amazon Macie to discover sensitive data. After enabling Macie, they notice that no sensitive data findings are generated. The S3 bucket is in the same account. What is the most likely reason?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The S3 bucket is in a different AWS Region than the Macie session.
Option D is correct because Macie requires the bucket to be in the same AWS Region as the Macie session. Option A is incorrect because Macie can access buckets in the same account without cross-account roles. Option B is incorrect because Macie uses service-linked roles, not object ACLs. Option C is incorrect because Macie does not require public access; it reads objects via IAM.
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.
✗
The bucket policy blocks access from Macie's service principal.
Why it's wrong here
Macie uses the Macie service-linked role.
✗
Macie is not configured with cross-account access to the bucket.
Why it's wrong here
Macie works within the same account.
✓
The S3 bucket is in a different AWS Region than the Macie session.
Why this is correct
Macie only analyzes data in the same Region.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The S3 objects have private ACLs that prevent Macie from reading them.
Why it's wrong here
Macie uses IAM permissions, not ACLs.
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.
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.
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: The S3 bucket is in a different AWS Region than the Macie session. — Option D is correct because Macie requires the bucket to be in the same AWS Region as the Macie session. Option A is incorrect because Macie can access buckets in the same account without cross-account roles. Option B is incorrect because Macie uses service-linked roles, not object ACLs. Option C is incorrect because Macie does not require public access; it reads objects via IAM.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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