ANS-C01 Network Security, Compliance and Governance Practice Question
This ANS-C01 practice question tests your understanding of network security, compliance and governance. 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 to manage multiple accounts. The security team wants to enforce that all S3 buckets across the organization are encrypted with SSE-S3. Which control mechanism should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a service control policy (SCP) that denies PutBucketEncryption if the encryption is not SSE-S3.
Option A is correct because SCPs can deny actions that do not comply with encryption requirements. Option B is wrong because IAM policies are account-level and cannot enforce across all accounts. Option C is wrong because bucket policies are per-bucket. Option D is wrong because CloudTrail is logging, not enforcement.
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.
✗
Assign an IAM policy to all users that requires SSE-S3.
Why it's wrong here
Does not cover all principals, e.g., service roles.
✗
Configure a bucket policy on each bucket to deny writes without SSE-S3.
Why it's wrong here
Requires manual configuration per bucket.
✓
Create a service control policy (SCP) that denies PutBucketEncryption if the encryption is not SSE-S3.
Why this is correct
SCPs can enforce policies across all accounts in the organization.
Related concept
Standard ACLs match source addresses.
✗
Use AWS CloudTrail to monitor and alert on non-compliant bucket creations.
Why it's wrong here
Only alerts, does not enforce.
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: Create a service control policy (SCP) that denies PutBucketEncryption if the encryption is not SSE-S3. — Option A is correct because SCPs can deny actions that do not comply with encryption requirements. Option B is wrong because IAM policies are account-level and cannot enforce across all accounts. Option C is wrong because bucket policies are per-bucket. Option D is wrong because CloudTrail is logging, not enforcement.
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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