The correct answer is to apply a service control policy (SCP) to the root organizational unit that denies s3:PutBucketEncryption unless encryption is set. This works because SCPs act as a centralized permission guardrail at the AWS Organizations level, allowing you to enforce S3 bucket encryption across all accounts without modifying individual buckets—any attempt to create or modify a bucket without enabling server-side encryption is automatically blocked. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of preventive controls versus detective or reactive ones; a common trap is choosing S3 default encryption (which is per-bucket and not centrally enforced) or CloudTrail (which only logs, not enforces). Remember the key distinction: SCPs enforce at the organization root, while IAM roles and bucket policies are account-specific. Memory tip: think of an SCP as a “global bouncer” at the organization door—if the encryption key isn’t present, the bucket doesn’t get in.
SAP-C02 Practice Question: Design Solutions for Organizational Complexity
This SAP-C02 practice question tests your understanding of design solutions for organizational complexity. 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 multinational company has multiple AWS accounts managed via AWS Organizations. The security team requires that all S3 buckets across all accounts must have server-side encryption enabled. The company wants to enforce this policy centrally without modifying each bucket individually. Which solution is MOST effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply a service control policy (SCP) to the root organizational unit that denies s3:PutBucketEncryption unless encryption is set.
Option C is correct because using an SCP at the root OU can deny the creation of S3 buckets without encryption across all accounts. Option A is wrong because S3 default encryption is per-bucket and not centrally enforced. Option B is wrong because IAM roles cannot enforce encryption across accounts. Option D is wrong because CloudTrail only logs, not enforces.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Apply a service control policy (SCP) to the root organizational unit that denies s3:PutBucketEncryption unless encryption is set.
Why this is correct
SCPs centrally enforce policies on all accounts in the organization.
Related concept
Static NAT maps one inside address to one outside address.
✗
Create an IAM role that all users must assume to create buckets, and attach a policy requiring encryption.
Why it's wrong here
Roles cannot be enforced for all API calls across accounts.
✗
Use AWS CloudTrail to monitor bucket creation and trigger a Lambda function to enable encryption.
Why it's wrong here
This is reactive, not preventive.
✗
Enable default encryption on each S3 bucket using a custom AWS Config rule.
Why it's wrong here
This requires per-bucket configuration and is not centralized.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
Design Solutions for Organizational Complexity — This question tests Design Solutions for Organizational Complexity — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Apply a service control policy (SCP) to the root organizational unit that denies s3:PutBucketEncryption unless encryption is set. — Option C is correct because using an SCP at the root OU can deny the creation of S3 buckets without encryption across all accounts. Option A is wrong because S3 default encryption is per-bucket and not centrally enforced. Option B is wrong because IAM roles cannot enforce encryption across accounts. Option D is wrong because CloudTrail only logs, not enforces.
What should I do if I get this SAP-C02 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related SAP-C02 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company has multiple AWS accounts managed via AWS Organizations. The security team needs to enforce that all newly created S3 buckets in any account have server-side encryption (SSE-S3 or SSE-KMS) enabled. Which solution should the team implement?
medium
A.Create an IAM role with a policy that requires encryption on S3 buckets and attach it to all users.
B.Configure S3 bucket policies on each existing bucket to deny requests that do not include encryption.
✓ C.Create a service control policy (SCP) that denies the s3:CreateBucket action unless the request includes s3:x-amz-server-side-encryption header.
D.Enable AWS CloudTrail to log all S3 API calls and set up a CloudWatch alarm to notify when a bucket without encryption is created.
Why C: Option C is correct because a service control policy (SCP) in AWS Organizations can centrally deny the s3:CreateBucket action unless the request includes the s3:x-amz-server-side-encryption header. This enforces encryption on all newly created S3 buckets across all accounts in the organization, regardless of individual account permissions, and does not require modifying existing buckets or user policies.
Variation 2. A company has multiple AWS accounts managed via AWS Organizations. The security team needs to enforce that all S3 buckets across all accounts have server-side encryption with AWS KMS (SSE-KMS) enabled, and any new bucket that does not comply must be automatically remediated. Which design should be used?
medium
A.Use AWS Resource Access Manager (RAM) to share a KMS key across accounts, and enable default encryption in each account's S3 settings.
✓ B.Use a Service Control Policy (SCP) to deny PutBucketEncryption actions that do not set SSE-KMS, and use AWS Config with a custom rule and automatic remediation via Lambda to fix existing buckets.
C.Use AWS Config to detect non-compliant buckets and a Service Control Policy (SCP) to enforce encryption on existing buckets.
D.Use AWS CloudTrail to monitor bucket creation, and trigger a Lambda function to enable SSE-KMS on new buckets.
Why B: Option C is correct because it uses a Service Control Policy (SCP) to deny creation of buckets without SSE-KMS, and a Config rule with auto-remediation via Lambda to fix existing non-compliant buckets. Option A is wrong because SCPs cannot remediate existing buckets. Option B is wrong because CloudTrail is for logging, not enforcement. Option D is wrong because Resource Access Manager (RAM) does not enforce encryption.
Variation 3. A company has multiple AWS accounts managed through AWS Organizations. The security team wants to enforce that all S3 buckets across all accounts are encrypted with a specific KMS key. What is the MOST efficient way to achieve this?
easy
A.Use AWS Config rules to detect unencrypted buckets and trigger a Lambda function to encrypt them retroactively.
✓ B.Attach a service control policy (SCP) to the root organizational unit that denies s3:PutBucketEncryption unless the specified KMS key is used.
C.Deploy a CloudFormation StackSet that creates a bucket policy in each account requiring encryption.
D.Create an IAM policy in each account that denies PutBucketEncryption unless the specified KMS key is used.
Why B: Using an SCP under the root OU prevents any account from creating unencrypted buckets or using a different KMS key. Option A is wrong because individual account IAM policies are harder to manage at scale. Option C is wrong because AWS Config can detect but not enforce. Option D is wrong because CloudFormation StackSets require manual deployment to each account.
Variation 4. A company has multiple AWS accounts managed via AWS Organizations. The security team wants to centrally enforce that all S3 buckets across all accounts have server-side encryption enabled. Which solution should be used?
medium
A.Use AWS CloudTrail to monitor and alert on bucket creation without encryption
B.Use AWS Config rules with auto-remediation in each account
✓ C.Attach a service control policy (SCP) to the root organizational unit that denies s3:PutBucket without encryption
D.Define an IAM policy in each account to deny S3:PutBucket without encryption
Why C: Option C is correct because a service control policy (SCP) attached to the root organizational unit can centrally deny the s3:PutBucket action unless the request includes a condition that requires server-side encryption (e.g., s3:x-amz-server-side-encryption). SCPs apply to all accounts in the organization, ensuring that even administrators in member accounts cannot create unencrypted buckets, and they cannot be overridden by IAM policies within those accounts.
Variation 5. A company has multiple AWS accounts managed via AWS Organizations. The security team wants to enforce that all S3 buckets across all accounts are encrypted with AWS KMS keys managed by the security team. What is the MOST scalable and maintainable solution?
medium
✓ A.Apply a service control policy (SCP) at the root OU that denies s3:PutBucketAcl or s3:PutBucketPolicy actions unless encryption is configured.
B.Use AWS Trusted Advisor to check for unencrypted buckets and notify the security team.
C.Use AWS Config rules in each account to detect non-compliant buckets and trigger auto-remediation.
D.Create a CloudFormation StackSet that deploys an S3 bucket policy in every account.
Why A: Option A is correct because an SCP applied at the root OU can deny any S3 PutBucketAcl or PutBucketPolicy action unless the request includes a condition that the bucket encryption uses a KMS key from the security team’s account. This approach is centralized, scales across all accounts automatically, and prevents non-compliant buckets from being created or modified, making it the most scalable and maintainable solution.
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