- A
AWS Database Migration Service (DMS)
Why wrong: AWS DMS is used for database migration, not for data masking in transit.
- B
AWS Data Pipeline
Why wrong: AWS Data Pipeline orchestrates workflows but lacks native data masking capabilities.
- C
Amazon Kinesis Data Firehose
Correct. Kinesis Data Firehose can use Lambda functions to perform data transformation, including masking PII, as data flows through the pipeline.
- D
AWS Glue
Why wrong: AWS Glue is a batch ETL service; while it can mask data, it is not designed for masking data in transit in a real-time streaming pipeline.
Question 200 of 1,786
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 is designing a data pipeline that ingests data from an on-premises database to Amazon S3. The data contains personally identifiable information (PII) that must be masked before storage. Which AWS service can be used to mask the data in transit?
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
✓
Amazon Kinesis Data Firehose
Amazon Kinesis Data Firehose can invoke an AWS Lambda function to transform and mask data in transit before delivering to Amazon S3. This makes it suitable for masking PII in a streaming pipeline. AWS Glue is designed for batch ETL jobs, not real-time masking during transit. AWS DMS is for database migration, and AWS Data Pipeline orchestrates workflows without native masking capabilities.
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.
- ✗
AWS Database Migration Service (DMS)
Why it's wrong here
AWS DMS is used for database migration, not for data masking in transit.
- ✗
AWS Data Pipeline
Why it's wrong here
AWS Data Pipeline orchestrates workflows but lacks native data masking capabilities.
- ✓
Amazon Kinesis Data Firehose
Why this is correct
Correct. Kinesis Data Firehose can use Lambda functions to perform data transformation, including masking PII, as data flows through the pipeline.
Related concept
CIDR notation defines the prefix length.
- ✗
AWS Glue
Why it's wrong here
AWS Glue is a batch ETL service; while it can mask data, it is not designed for masking data in transit in a real-time streaming pipeline.
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.
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 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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Data Security and Governance — study guide chapter
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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 — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Amazon Kinesis Data Firehose — Amazon Kinesis Data Firehose can invoke an AWS Lambda function to transform and mask data in transit before delivering to Amazon S3. This makes it suitable for masking PII in a streaming pipeline. AWS Glue is designed for batch ETL jobs, not real-time masking during transit. AWS DMS is for database migration, and AWS Data Pipeline orchestrates workflows without native masking capabilities.
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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Last reviewed: Jun 20, 2026
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