This DEA-C01 practice question tests your understanding of data ingestion and transformation. 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 data engineer needs to transform CSV files to Parquet format using AWS Glue. The source data contains sensitive columns that must be masked. Which Glue feature should be used?
AWS Glue DataBrew
DataBrew provides visual data preparation with built-in masking.
AWS Glue Studio
Why wrong: Glue Studio is for building ETL jobs, but masking requires custom logic.
AWS Glue Crawler
Why wrong: Crawlers catalog metadata, not transform.
AWS Glue Schema Registry
Why wrong: Schema Registry manages schemas, not transformations.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AWS Glue DataBrew
Option B is correct because Glue DataBrew provides built-in transformations like masking. Option A is wrong because Glue Studio is for building visual ETL jobs but not specifically for masking. Option C is wrong because Glue crawlers catalog data, not transform. Option D is wrong because Glue Schema Registry manages schemas.
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
For each option: why learners choose it and why it is or isn't the right answer here.
AWS Glue DataBrew
Why this is correct
DataBrew provides visual data preparation with built-in masking.
Related concept
CIDR notation defines the prefix length.
AWS Glue Studio
Why it's wrong here
Glue Studio is for building ETL jobs, but masking requires custom logic.
AWS Glue Crawler
Why it's wrong here
Crawlers catalog metadata, not transform.
AWS Glue Schema Registry
Why it's wrong here
Schema Registry manages schemas, not transformations.
Common exam traps
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
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.
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
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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.
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FAQ
Data Ingestion and Transformation — This question tests Data Ingestion and Transformation — CIDR notation defines the prefix length..
The correct answer is: AWS Glue DataBrew — Option B is correct because Glue DataBrew provides built-in transformations like masking. Option A is wrong because Glue Studio is for building visual ETL jobs but not specifically for masking. Option C is wrong because Glue crawlers catalog data, not transform. Option D is wrong because Glue Schema Registry manages schemas.
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.
CIDR notation defines the prefix length.
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Last reviewed: Jun 20, 2026
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.
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