The answer is AWS Lake Formation, which should be used to enforce data masking of PII when queried by non-owners. Lake Formation provides fine-grained column-level security and dynamic data masking directly on the Glue Data Catalog, allowing you to define policies that automatically mask sensitive columns like social security numbers or email addresses at query time without altering the underlying data in Amazon S3. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how Lake Formation integrates with AWS Glue to enforce access controls, often appearing as a distractor against S3 Object Lambda (which modifies data at the API level, not query level) or IAM policies (which cannot mask data). A common trap is choosing Macie, but remember Macie only discovers and classifies PII—it does not enforce masking. Memory tip: think of Lake Formation as the “gatekeeper” that masks columns as data flows through the catalog, while Macie is just the “detective” that finds the PII.
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 uses AWS Glue to catalog data in Amazon S3. The data includes personally identifiable information (PII). The security team requires that PII be masked when queried by users who are not data owners. Which AWS service should be used to enforce this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS Lake Formation to define column-level security and data masking.
Option B is correct because AWS Lake Formation provides fine-grained access control and column-level masking for data cataloged in the Glue Data Catalog. Option A is wrong because S3 Object Lambda modifies data at the S3 API level, not at the query level. Option C is wrong because IAM policies cannot mask data. Option D is wrong because Macie discovers and classifies PII but does not enforce access controls.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 Amazon Macie to automatically redact PII from S3 objects.
Why it's wrong here
Macie discovers and classifies data but does not enforce access controls.
✗
Use IAM policies with condition keys to restrict access based on tags.
Why it's wrong here
IAM policies cannot mask data within query results.
✓
Use AWS Lake Formation to define column-level security and data masking.
Why this is correct
Lake Formation provides column-level permissions and dynamic masking.
Use Amazon S3 Object Lambda to transform data on the fly.
Why it's wrong here
S3 Object Lambda operates at the object level, not for SQL queries.
Common exam traps
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
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 block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DEA-C01 subnetting questions on CIDR, address ranges, and subnet selection.
Data Security and Governance — This question tests Data Security and Governance — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Use AWS Lake Formation to define column-level security and data masking. — Option B is correct because AWS Lake Formation provides fine-grained access control and column-level masking for data cataloged in the Glue Data Catalog. Option A is wrong because S3 Object Lambda modifies data at the S3 API level, not at the query level. Option C is wrong because IAM policies cannot mask data. Option D is wrong because Macie discovers and classifies PII but does not enforce access controls.
What should I do if I get this DEA-C01 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related DEA-C01 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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