ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and 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 company uses AWS Organizations to manage multiple accounts. The security team wants to ensure that all Amazon S3 buckets in the organization are encrypted at rest. Which policy should be attached to the root organizational unit 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
✓
Attach a service control policy (SCP) that denies s3:CreateBucket unless the bucket has default encryption enabled.
A service control policy (SCP) attached to the root OU can deny creation of S3 buckets without default encryption, enforcing encryption across all accounts. Option A is correct because SCPs allow you to centrally control permissions. Option B is wrong because IAM roles are per-account. Option C is wrong because bucket policies are per-bucket, not organization-wide. Option D is wrong because AWS Config rules can detect but not enforce in real time.
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.
✗
Configure AWS Config rules to mark non-compliant buckets and trigger a Lambda function to add encryption.
Why it's wrong here
This is reactive, not proactive enforcement.
✗
Create an IAM role in each account that requires encryption for any S3 operation.
Why it's wrong here
IAM roles are not inherited across accounts and cannot enforce across all accounts centrally.
✗
Use an S3 bucket policy on every existing and future bucket to deny unencrypted uploads.
Why it's wrong here
Bucket policies are per-bucket and cannot be enforced automatically on new buckets.
✓
Attach a service control policy (SCP) that denies s3:CreateBucket unless the bucket has default encryption enabled.
Why this is correct
SCPs can enforce encryption at the organizational level.
Related concept
Standard ACLs match source addresses.
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 ANS-C01 ACL questions on filtering logic and placement.
Network Security, Compliance and Governance — This question tests Network Security, Compliance and Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Attach a service control policy (SCP) that denies s3:CreateBucket unless the bucket has default encryption enabled. — A service control policy (SCP) attached to the root OU can deny creation of S3 buckets without default encryption, enforcing encryption across all accounts. Option A is correct because SCPs allow you to centrally control permissions. Option B is wrong because IAM roles are per-account. Option C is wrong because bucket policies are per-bucket, not organization-wide. Option D is wrong because AWS Config rules can detect but not enforce in real time.
What should I do if I get this ANS-C01 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 ANS-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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