The answer is to apply a service control policy (SCP) to the root organizational unit (OU) that denies the s3:PutBucketPublicAccessBlock action. This is the most efficient method because an SCP attached to the root OU cascades to all member accounts and cannot be overridden by account administrators, ensuring a consistent, organization-wide block on public access without requiring per-account configuration. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your understanding of centralized governance using AWS Organizations—a common trap is to confuse SCPs with bucket policies or IAM roles, but remember that SCPs set permission boundaries at the account level, not the resource level. A key memory tip: think of SCPs as a "master switch" that enforces guardrails across your entire organization, making them ideal for security baselines like blocking public S3 access.
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 is using AWS Organizations with multiple accounts. The security team requires that all S3 buckets across the organization block public access. What is the MOST efficient way to enforce this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply an SCP to the root OU that denies s3:PutBucketPublicAccessBlock actions.
Using an SCP at the root OU is the most efficient way to enforce the policy across all accounts, as it applies to all member accounts and cannot be overridden by account administrators. Option A is wrong because SCPs can enforce restrictions. Option B is wrong because it would require per-account changes. Option D is wrong because bucket policies are account-specific and do not enforce across accounts.
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.
✗
Use AWS Config rules to detect and remediate public buckets in each account.
Why it's wrong here
AWS Config can detect but is reactive, not preventive.
✗
Create a CloudFormation StackSet to deploy bucket policies in every account.
Why it's wrong here
StackSets require manual updates and don't prevent future violations.
✗
Use IAM roles to restrict users from modifying bucket public access settings.
Why it's wrong here
IAM roles apply per user, not across all buckets in an account.
✓
Apply an SCP to the root OU that denies s3:PutBucketPublicAccessBlock actions.
Why this is correct
SCPs prevent the action across all accounts in the OU.
Related concept
Static NAT maps one inside address to one outside address.
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 an SCP to the root OU that denies s3:PutBucketPublicAccessBlock actions. — Using an SCP at the root OU is the most efficient way to enforce the policy across all accounts, as it applies to all member accounts and cannot be overridden by account administrators. Option A is wrong because SCPs can enforce restrictions. Option B is wrong because it would require per-account changes. Option D is wrong because bucket policies are account-specific and do not enforce across accounts.
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.
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