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Data Security and Governance →hardMultiple ChoiceObjective-mapped

DEA-C01 Data Security and Governance Practice Question

Q: How is Data Security and Governance tested on the DEA-C01 exam?

Data Security and Governance — This question tests Data Security and Governance — Standard ACLs match source addresses..

Q: What is the correct answer to this Data Security and Governance DEA-C01 question?

The correct answer is: The bucket policy allows access, but the VPC endpoint policy denies the action. — The most likely reason for the denial is that the VPC endpoint policy denies the action. Even if the bucket policy allows access to the IAM role, the VPC endpoint policy can explicitly deny the action, which overrides the bucket policy. Option A is incorrect because AES-256 encryption does not require additional permissions like s3:Decrypt. Option B is incorrect because the question indicates the bucket policy allows access, not denies. Option D is incorrect because S3 Block Public Access settings only apply to public access, not to requests from an IAM role.

Q: Why do candidates get Data Security and Governance questions wrong on the DEA-C01 exam?

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.

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 has an S3 bucket policy that allows access to a specific IAM role. However, an administrator notices that requests from that role are being denied. The bucket is encrypted with AES-256. What is the MOST likely reason for the denial?

Clue words in this question

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

Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

A
The IAM role does not have s3:Decrypt permission on the bucket.
Why wrong: AES-256 is server-side encryption and does not require decryption permissions.
B
The bucket policy has an explicit deny statement that overrides the allow.
Why wrong: The question states the policy allows access, so an explicit deny would contradict that.
C
The bucket policy allows access, but the VPC endpoint policy denies the action.
A VPC endpoint policy can restrict actions even if the bucket policy allows them.
D
The S3 Block Public Access settings are blocking the request.
Why wrong: Block Public Access only affects public access, not IAM role access.

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

✓

The bucket policy allows access, but the VPC endpoint policy denies the action.

The most likely reason for the denial is that the VPC endpoint policy denies the action. Even if the bucket policy allows access to the IAM role, the VPC endpoint policy can explicitly deny the action, which overrides the bucket policy. Option A is incorrect because AES-256 encryption does not require additional permissions like s3:Decrypt. Option B is incorrect because the question indicates the bucket policy allows access, not denies. Option D is incorrect because S3 Block Public Access settings only apply to public access, not to requests from an IAM role.

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.

✗
The IAM role does not have s3:Decrypt permission on the bucket.
Why it's wrong here
AES-256 is server-side encryption and does not require decryption permissions.
✗
The bucket policy has an explicit deny statement that overrides the allow.
Why it's wrong here
The question states the policy allows access, so an explicit deny would contradict that.
✓
The bucket policy allows access, but the VPC endpoint policy denies the action.
Why this is correct
A VPC endpoint policy can restrict actions even if the bucket policy allows them.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The S3 Block Public Access settings are blocking the request.
Why it's wrong here
Block Public Access only affects public access, not IAM role access.

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

Symmetric Encryption Algorithm Comparison

Algorithm	Key Size	Block Size	Status	Notes
AES-128	128-bit	128-bit	Current standard	NIST approved; WPA3, TLS
AES-256	256-bit	128-bit	Current standard	Preferred for sensitive / govt data
3DES	112-bit effective	64-bit	Deprecated (2023)	Replaced by AES
DES	56-bit	64-bit	Broken	Cracked in < 24 h; never deploy
ChaCha20	256-bit	Stream cipher	Current	TLS 1.3, WireGuard

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: The bucket policy allows access, but the VPC endpoint policy denies the action. — The most likely reason for the denial is that the VPC endpoint policy denies the action. Even if the bucket policy allows access to the IAM role, the VPC endpoint policy can explicitly deny the action, which overrides the bucket policy. Option A is incorrect because AES-256 encryption does not require additional permissions like s3:Decrypt. Option B is incorrect because the question indicates the bucket policy allows access, not denies. Option D is incorrect because S3 Block Public Access settings only apply to public access, not to requests from an IAM role.

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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Standard ACLs match source addresses.

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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.