- A
Use a service control policy (SCP) in the Organizations root to deny PutBucketEncryption actions when encryption settings do not include AES256 or aws:kms.
SCPs are preventive controls that apply organization-wide, including future accounts.
- B
Use AWS Config rules to detect unencrypted buckets and automatically apply encryption using a remediation action.
Why wrong: Config rules are detective and reactive, not preventive.
- C
Enable AWS CloudTrail to log all S3 API calls and send alerts when non-compliant buckets are created.
Why wrong: CloudTrail logs events but does not prevent non-compliant actions.
- D
Create an IAM policy in each account that denies PutBucketEncryption unless encryption is enabled.
Why wrong: IAM policies must be applied per account and don't automatically apply to new accounts.
DOP-C02 Security and Compliance Practice Question
This DOP-C02 practice question tests your understanding of security and compliance. 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 is using AWS Organizations with multiple accounts. The security team wants to enforce that all S3 buckets have encryption enabled. They need a preventive control that applies to all current and future accounts. Which approach should they use?
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
Use a service control policy (SCP) in the Organizations root to deny PutBucketEncryption actions when encryption settings do not include AES256 or aws:kms.
A service control policy (SCP) applied at the Organizations root can deny the creation or modification of S3 buckets that do not have encryption enabled, specifically requiring AES256 or aws:kms. This is a preventive control that applies to all current and future accounts in the organization, as SCPs are inherited by all accounts and cannot be overridden by IAM policies within those accounts.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 a service control policy (SCP) in the Organizations root to deny PutBucketEncryption actions when encryption settings do not include AES256 or aws:kms.
Why this is correct
SCPs are preventive controls that apply organization-wide, including future accounts.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS Config rules to detect unencrypted buckets and automatically apply encryption using a remediation action.
Why it's wrong here
Config rules are detective and reactive, not preventive.
- ✗
Enable AWS CloudTrail to log all S3 API calls and send alerts when non-compliant buckets are created.
Why it's wrong here
CloudTrail logs events but does not prevent non-compliant actions.
- ✗
Create an IAM policy in each account that denies PutBucketEncryption unless encryption is enabled.
Why it's wrong here
IAM policies must be applied per account and don't automatically apply to new accounts.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse detective controls (like AWS Config or CloudTrail) with preventive controls (like SCPs), or assume that IAM policies applied per account are sufficient for organization-wide enforcement, failing to recognize that SCPs are the only mechanism that applies uniformly to all accounts, including future ones.
Detailed technical explanation
How to think about this question
SCPs are evaluated before any IAM or resource-based policies, and they use an allow list or deny list approach at the organization level. When an SCP denies PutBucketEncryption unless the encryption settings include AES256 or aws:kms, the S3 API call is blocked at the AWS Organizations boundary, even if the IAM policy in the account would otherwise allow it. This ensures that no account, including the management account, can create or modify a bucket without encryption, providing a true preventive guardrail.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Security and Compliance — This question tests Security and Compliance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use a service control policy (SCP) in the Organizations root to deny PutBucketEncryption actions when encryption settings do not include AES256 or aws:kms. — A service control policy (SCP) applied at the Organizations root can deny the creation or modification of S3 buckets that do not have encryption enabled, specifically requiring AES256 or aws:kms. This is a preventive control that applies to all current and future accounts in the organization, as SCPs are inherited by all accounts and cannot be overridden by IAM policies within those accounts.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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