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Data Security and Governance →hardMultiple 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 company uses AWS Lake Formation to manage data lake permissions. The data engineer notices that a user with SELECT permission on a table can also query the underlying data in Amazon S3 directly. How can the engineer enforce that access to the S3 data is only through Lake Formation?

A
Use S3 Access Points with a policy that restricts access to only Lake Formation
Why wrong: Access Points can restrict access, but Lake Formation still requires appropriate IAM permissions; this does not fully enforce the requirement.
B
Grant the user permissions only through Lake Formation and remove any IAM policies that allow direct S3 access to the data location
This ensures that the user can only access data through Lake Formation, and direct S3 access is blocked.
C
Enable S3 Block Public Access on the bucket
Why wrong: Block Public Access prevents public access but does not prevent authenticated users with IAM permissions from accessing S3 directly.
D
Change the S3 bucket policy to deny all access except from Lake Formation
Why wrong: Lake Formation does not have a specific principal; it uses IAM roles. This approach is not straightforward and may not work as expected.

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

✓

Grant the user permissions only through Lake Formation and remove any IAM policies that allow direct S3 access to the data location

Option B is correct because when using Lake Formation, you should grant permissions only through Lake Formation and remove any IAM policies that allow direct S3 access. This ensures that users cannot bypass Lake Formation's fine-grained access controls. Option A (S3 Access Points) can restrict access but does not inherently enforce Lake Formation-only access unless properly configured with a policy that specifically allows only Lake Formation, which is more complex and not the recommended approach. Option C (S3 Block Public Access) only prevents public access but does not prevent authorized IAM users from direct access. Option D (bucket policy denying all except Lake Formation) could work but is not the simplest or most standard method; the recommended practice is to use Lake Formation's integration and manage permissions centrally.

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 Access Points with a policy that restricts access to only Lake Formation
Why it's wrong here
Access Points can restrict access, but Lake Formation still requires appropriate IAM permissions; this does not fully enforce the requirement.
✓
Grant the user permissions only through Lake Formation and remove any IAM policies that allow direct S3 access to the data location
Why this is correct
This ensures that the user can only access data through Lake Formation, and direct S3 access is blocked.
Related concept
Standard ACLs match source addresses.
✗
Enable S3 Block Public Access on the bucket
Why it's wrong here
Block Public Access prevents public access but does not prevent authenticated users with IAM permissions from accessing S3 directly.
✗
Change the S3 bucket policy to deny all access except from Lake Formation
Why it's wrong here
Lake Formation does not have a specific principal; it uses IAM roles. This approach is not straightforward and may not work as expected.

Common exam traps

Common exam trap: ACLs stop at the first match

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.

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 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.

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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 — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Grant the user permissions only through Lake Formation and remove any IAM policies that allow direct S3 access to the data location — Option B is correct because when using Lake Formation, you should grant permissions only through Lake Formation and remove any IAM policies that allow direct S3 access. This ensures that users cannot bypass Lake Formation's fine-grained access controls. Option A (S3 Access Points) can restrict access but does not inherently enforce Lake Formation-only access unless properly configured with a policy that specifically allows only Lake Formation, which is more complex and not the recommended approach. Option C (S3 Block Public Access) only prevents public access but does not prevent authorized IAM users from direct access. Option D (bucket policy denying all except Lake Formation) could work but is not the simplest or most standard method; the recommended practice is to use Lake Formation's integration and manage permissions centrally.

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

What is the key concept behind this question?

Standard ACLs match source addresses.

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