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Question 357 of 1,740

SDLC Automation →hardMultiple ChoiceObjective-mapped

Quick Answer

The answer is that the SCP is incorrectly scoped to the management account instead of the member accounts. This is the most likely cause because service control policies (SCPs) in AWS Organizations apply globally to all principals within the account they are attached to, but they do not affect the management account itself—only member accounts. When an SCP denying S3 bucket creation is applied to the management account, it has no effect, but if it is incorrectly scoped there while the CloudFormation stack runs in a member account, the deny condition may still block the s3:PutBucketEncryption action required for SSE-S3, even when the template includes encryption. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this tests your understanding of SCP inheritance and the critical distinction between management and member accounts. A common trap is assuming SCPs block all accounts equally, but remember: the management account is immune to SCPs. Memory tip: “SCP scope—member only, not the home.”

DOP-C02 SDLC Automation Practice Question

This DOP-C02 practice question tests your understanding of sdlc automation. 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.

An organization uses AWS CloudFormation to manage infrastructure across multiple accounts using AWS Organizations. They want to enforce that all S3 buckets are encrypted with SSE-S3. A DevOps engineer creates a service control policy (SCP) to deny the creation of any S3 bucket without encryption. However, CloudFormation stack creation fails with an access denied error even when the template includes encryption. What is the most likely cause?

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.

Question 1hardmultiple choice

Full question →

A
The CloudFormation template specifies SSE-KMS encryption, which is not allowed by the SCP.
Why wrong: The SCP is intended to enforce SSE-S3, so SSE-KMS would be denied; but the question says even with encryption included, it fails.
B
The SCP is denying the s3:PutBucketPublicAccessBlock action, which is required for all bucket creation requests.
Why wrong: While SCPs can deny actions, the typical issue is that the SCP's condition key for encryption might be incorrect or too restrictive.
C
The SCP is incorrectly scoped to the management account instead of the member accounts.
If the SCP is attached to the management account, it does not affect member accounts; but the error suggests it is affecting the member account. The most likely cause is that the SCP uses a condition that denies bucket creation if encryption is not set, but CloudFormation creates buckets with a default encryption property that might not match the expected condition key, or the SCP denies the action outright.
D
The CloudFormation service role does not have permissions to create buckets in the target account.
Why wrong: The error is access denied, not permissions boundary; the SCP is likely the cause.

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 SCP is incorrectly scoped to the management account instead of the member accounts.

Option A is correct because SCPs apply globally to all principals in the account, and if the SCP denies the s3:PutBucketPublicAccessBlock action (required for bucket creation) or the specific encryption deny condition is too broad, it can block legitimate requests. Option B is unlikely because CloudFormation uses the role's permissions, not the user's directly. Option C is incorrect because SSE-S3 is server-side encryption. Option D is incorrect because CloudFormation does not require a separate SCP.

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 CloudFormation template specifies SSE-KMS encryption, which is not allowed by the SCP.
Why it's wrong here
The SCP is intended to enforce SSE-S3, so SSE-KMS would be denied; but the question says even with encryption included, it fails.
✗
The SCP is denying the s3:PutBucketPublicAccessBlock action, which is required for all bucket creation requests.
Why it's wrong here
While SCPs can deny actions, the typical issue is that the SCP's condition key for encryption might be incorrect or too restrictive.
✓
The SCP is incorrectly scoped to the management account instead of the member accounts.
Why this is correct
If the SCP is attached to the management account, it does not affect member accounts; but the error suggests it is affecting the member account. The most likely cause is that the SCP uses a condition that denies bucket creation if encryption is not set, but CloudFormation creates buckets with a default encryption property that might not match the expected condition key, or the SCP denies the action outright.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The CloudFormation service role does not have permissions to create buckets in the target account.
Why it's wrong here
The error is access denied, not permissions boundary; the SCP is likely the cause.

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.

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 DOP-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

SDLC Automation — This question tests SDLC Automation — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: The SCP is incorrectly scoped to the management account instead of the member accounts. — Option A is correct because SCPs apply globally to all principals in the account, and if the SCP denies the s3:PutBucketPublicAccessBlock action (required for bucket creation) or the specific encryption deny condition is too broad, it can block legitimate requests. Option B is unlikely because CloudFormation uses the role's permissions, not the user's directly. Option C is incorrect because SSE-S3 is server-side encryption. Option D is incorrect because CloudFormation does not require a separate SCP.

What should I do if I get this DOP-C02 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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