DEA-C01 Data Security and Governance Practice Question
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 company has a data lake in Amazon S3 with millions of objects. The security team wants to enforce that all objects are encrypted with a specific customer-managed KMS key. The data engineer configures an S3 bucket policy to deny PutObject if the encryption is not set to that key. However, some existing objects are not encrypted with that key. What is the most efficient way to remediate the existing objects?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use S3 Batch Operations to copy objects in the same bucket with the new encryption settings.
Option D is correct because S3 Batch Operations can copy objects in place with new encryption settings, efficiently updating millions of objects. Option A is wrong because it is inefficient for millions of objects. Option B is wrong because S3 Replication is for cross-region or cross-bucket copying. Option C is wrong because S3 Object Lambda modifies data on read, not at rest.
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.
✗
Use S3 Cross-Region Replication to replicate objects to a new bucket with the correct encryption.
Why it's wrong here
Replication does not change encryption of existing objects in the same bucket.
✗
Write a script using the AWS SDK to iterate over all objects and re-upload them with the correct encryption.
Why it's wrong here
Inefficient and time-consuming for millions of objects.
✓
Use S3 Batch Operations to copy objects in the same bucket with the new encryption settings.
Why this is correct
Batch Operations can efficiently update encryption for large numbers of objects.
Related concept
Standard ACLs match source addresses.
✗
Use S3 Object Lambda to dynamically encrypt objects on read.
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: Use S3 Batch Operations to copy objects in the same bucket with the new encryption settings. — Option D is correct because S3 Batch Operations can copy objects in place with new encryption settings, efficiently updating millions of objects. Option A is wrong because it is inefficient for millions of objects. Option B is wrong because S3 Replication is for cross-region or cross-bucket copying. Option C is wrong because S3 Object Lambda modifies data on read, not at rest.
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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Question Discussion
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