The answer is to apply a bucket policy that denies PutObject without the x-amz-server-side-encryption header, combined with an SCP and default encryption. This trio enforces S3 encryption at rest by ensuring that every upload must include encryption parameters, blocking any request that lacks them at the bucket policy level, while the SCP acts as a guardrail across all accounts to prevent circumvention, and default encryption provides a fallback for objects uploaded without explicit headers. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of defense-in-depth for data protection, often appearing as a multi-select question where you must identify overlapping controls rather than relying on a single mechanism. A common trap is choosing only bucket policies or default encryption alone, forgetting that SCPs enforce organization-wide compliance. Memory tip: think "SCP as the bouncer, bucket policy as the door lock, and default encryption as the safety net."
SCS-C02 Management and Security Governance Practice Question
This SCS-C02 practice question tests your understanding of management and security 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 security engineer is designing a solution to protect sensitive data in S3. Which THREE mechanisms can be used to enforce encryption at rest?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an SCP to deny s3:PutObject without encryption
Option A is correct because an SCP (Service Control Policy) can be applied at the organizational level to deny any s3:PutObject action that does not include encryption parameters. This enforces encryption at rest across all accounts in the organization, preventing users from uploading unencrypted objects regardless of individual bucket policies or default encryption settings.
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 an SCP to deny s3:PutObject without encryption
Why this is correct
Enforces encryption across accounts.
Related concept
Read the scenario before looking for a memorised answer.
Read the scenario before looking for a memorised answer.
✗
Enable cross-region replication
Why it's wrong here
Replication does not enforce encryption.
✓
Apply a bucket policy that denies PutObject without the x-amz-server-side-encryption header
Why this is correct
Enforces encryption on upload.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable MFA Delete on the S3 bucket
Why it's wrong here
MFA Delete protects against accidental deletion, not encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse cross-region replication (which copies encrypted objects but does not enforce encryption) with an encryption enforcement mechanism, or they think MFA Delete relates to encryption at rest when it only protects against deletion.
Detailed technical explanation
How to think about this question
Under the hood, S3 server-side encryption can be enforced via bucket policies using the s3:x-amz-server-side-encryption condition key, which checks for the presence of the x-amz-server-side-encryption header in PutObject requests. Default encryption on a bucket automatically applies SSE-S3 or SSE-KMS to objects uploaded without encryption headers, but it can be overridden by explicit headers; combining default encryption with a bucket policy that denies unencrypted writes ensures no unencrypted objects can be stored.
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.
Management and Security Governance — This question tests Management and Security Governance — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use an SCP to deny s3:PutObject without encryption — Option A is correct because an SCP (Service Control Policy) can be applied at the organizational level to deny any s3:PutObject action that does not include encryption parameters. This enforces encryption at rest across all accounts in the organization, preventing users from uploading unencrypted objects regardless of individual bucket policies or default encryption settings.
What should I do if I get this SCS-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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Question Discussion
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