This SCS-C02 practice question tests your understanding of infrastructure security. 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 uses AWS Organizations to manage multiple accounts. The security team wants to enforce that all S3 buckets in the organization are encrypted with server-side encryption (SSE-S3) and that no public access is allowed. The team has created an SCP that denies the s3:PutBucketPublicAccessBlock action and also denies s3:PutBucketPolicy if the policy would grant public access. However, the team discovers that some buckets in the production account still have public access enabled. The SCP is applied to the root OU, which includes the production account. What is the most likely reason that the SCP is not being enforced?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The production account is the management account of the organization, and SCPs do not affect the management account.
Option C is correct. SCPs do not affect the management account; they only apply to member accounts. If the production account is the management account, SCPs will not apply. Option A is incorrect because SCPs don't require explicit allow; they deny by default if not allowed. Option B is incorrect because SCPs affect all IAM principals in the account. Option D is incorrect because SCPs can be applied to OUs.
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 SCP does not have an explicit allow for the actions it denies; SCPs require an explicit allow to take effect.
Why it's wrong here
SCPs deny by default; they don't need explicit allow.
✗
The SCP only applies to IAM users and roles, not to the root user.
Why it's wrong here
SCPs apply to all principals in the account, including root.
✓
The production account is the management account of the organization, and SCPs do not affect the management account.
Why this is correct
Management account is not affected by SCPs.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The SCP is not attached to the production account's OU; it is attached to the root OU.
Why it's wrong here
Attaching to root OU applies to all accounts in the organization.
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 SCS-C02 ACL questions on filtering logic and placement.
Infrastructure Security — This question tests Infrastructure Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The production account is the management account of the organization, and SCPs do not affect the management account. — Option C is correct. SCPs do not affect the management account; they only apply to member accounts. If the production account is the management account, SCPs will not apply. Option A is incorrect because SCPs don't require explicit allow; they deny by default if not allowed. Option B is incorrect because SCPs affect all IAM principals in the account. Option D is incorrect because SCPs can be applied to OUs.
What should I do if I get this SCS-C02 question wrong?
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 SCS-C02 ACL questions on filtering logic and placement.
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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