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Data Security and Governance →mediumMultiple ChoiceObjective-mapped

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 data engineer is designing a data pipeline that ingests customer data from an on-premises database into Amazon S3. The data contains personally identifiable information (PII). The company policy requires that all PII be masked before it is stored in S3. The pipeline uses AWS DMS for migration and AWS Glue for transformation. The engineer needs to ensure that the masking is applied consistently and that no unmasked data is written to S3. The engineer has set up DMS to replicate data to an S3 bucket, and then a Glue job reads from S3, applies masking, and writes to another S3 bucket. However, there is a risk that unmasked data in the first S3 bucket could be accessed before the Glue job runs. What should the engineer do to mitigate this risk?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

A
Configure DMS to apply masking transformations before writing to S3 using DMS's built-in transformation rules.
Why wrong: DMS does not have native masking capabilities; it can perform schema and data type transformations but not apply PII masking. This option does not solve the risk.
B
Block all access to the first S3 bucket except for the Glue job's IAM role.
Why wrong: Blocking all access except for the Glue role still leaves unmasked data in the bucket, and the Glue job itself could be compromised or delayed, leaving data exposed. This does not mitigate the risk of data persistence.
C
Use Amazon Kinesis Data Firehose to stream data directly to Glue for real-time masking.
Why wrong: Using Kinesis Data Firehose would require redesigning the pipeline and does not address the risk of unmasked data already in S3 from DMS. It also does not guarantee masking before storage.
D
Set an S3 Lifecycle policy on the first bucket to delete objects after 1 hour.
An S3 Lifecycle policy with expiration deletes objects from the first bucket within a short time (e.g., 1 hour), minimizing the window during which unmasked data could be accessed. This directly mitigates the risk.

Full breakdown with real-world context →

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

✓

Set an S3 Lifecycle policy on the first bucket to delete objects after 1 hour.

Option D is correct because an S3 Lifecycle policy with expiration can automatically delete objects from the first bucket after a short time, reducing the window of exposure for unmasked data. Option A is incorrect because DMS does not have native masking capabilities; it can transform data types but not mask PII. Option B is incorrect because blocking all access except for the Glue role would still leave unmasked data accessible to the Glue job, and the risk of exposure exists if the Glue job fails or is delayed. Option C is incorrect because Kinesis Data Firehose is not part of the existing pipeline and would require re-architecting.

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.

✗
Configure DMS to apply masking transformations before writing to S3 using DMS's built-in transformation rules.
Why it's wrong here
DMS does not have native masking capabilities; it can perform schema and data type transformations but not apply PII masking. This option does not solve the risk.
✗
Block all access to the first S3 bucket except for the Glue job's IAM role.
Why it's wrong here
Blocking all access except for the Glue role still leaves unmasked data in the bucket, and the Glue job itself could be compromised or delayed, leaving data exposed. This does not mitigate the risk of data persistence.
✗
Use Amazon Kinesis Data Firehose to stream data directly to Glue for real-time masking.
Why it's wrong here
Using Kinesis Data Firehose would require redesigning the pipeline and does not address the risk of unmasked data already in S3 from DMS. It also does not guarantee masking before storage.
✓
Set an S3 Lifecycle policy on the first bucket to delete objects after 1 hour.
Why this is correct
An S3 Lifecycle policy with expiration deletes objects from the first bucket within a short time (e.g., 1 hour), minimizing the window during which unmasked data could be accessed. This directly mitigates the risk.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
CIDR notation defines the prefix length.

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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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: Set an S3 Lifecycle policy on the first bucket to delete objects after 1 hour. — Option D is correct because an S3 Lifecycle policy with expiration can automatically delete objects from the first bucket after a short time, reducing the window of exposure for unmasked data. Option A is incorrect because DMS does not have native masking capabilities; it can transform data types but not mask PII. Option B is incorrect because blocking all access except for the Glue role would still leave unmasked data accessible to the Glue job, and the risk of exposure exists if the Glue job fails or is delayed. Option C is incorrect because Kinesis Data Firehose is not part of the existing pipeline and would require re-architecting.

What should I do if I get this DEA-C01 question wrong?

Are there clue words in this question I should notice?

Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.

What is the key concept behind this question?

CIDR notation defines the prefix length.

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