SCS-C02 Management and Security Governance Practice Question
This SCS-C02 practice question tests your understanding of management and security 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 uses AWS Key Management Service (KMS) to encrypt sensitive data in Amazon S3. The security team needs to ensure that the KMS key can only be used from within the company's VPC and not from the public internet. How can this be achieved?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a VPC endpoint for KMS and modify the KMS key policy to allow usage only from the specified VPC endpoint.
Using a VPC endpoint for KMS and a key policy that restricts usage to the VPC endpoint prevents public internet access. Option A is wrong because it does not restrict usage to VPC. Option B is wrong because an SCP cannot restrict KMS key usage to a specific VPC. Option D is wrong because CloudTrail does not enforce access restrictions.
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.
✗
Use an SCP to deny kms:Encrypt unless the request comes from the VPC.
Why it's wrong here
SCPs cannot condition on network origin like VPC; they operate on account level.
✗
Use AWS CloudTrail to monitor KMS calls and alert if they come from outside the VPC.
Why it's wrong here
Monitoring does not prevent usage; it only alerts after the fact.
✓
Create a VPC endpoint for KMS and modify the KMS key policy to allow usage only from the specified VPC endpoint.
Why this is correct
Key policy with condition 'aws:sourceVpce' restricts usage to the VPC endpoint.
Related concept
Standard ACLs match source addresses.
✗
Create a VPC endpoint for KMS and attach a bucket policy that requires the endpoint.
Why it's wrong here
Bucket policy can require the endpoint for S3 access, but does not restrict KMS key usage itself.
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 SCS-C02 ACL questions on filtering logic and placement.
Management and Security Governance — This question tests Management and Security Governance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create a VPC endpoint for KMS and modify the KMS key policy to allow usage only from the specified VPC endpoint. — Using a VPC endpoint for KMS and a key policy that restricts usage to the VPC endpoint prevents public internet access. Option A is wrong because it does not restrict usage to VPC. Option B is wrong because an SCP cannot restrict KMS key usage to a specific VPC. Option D is wrong because CloudTrail does not enforce access restrictions.
What should I do if I get this SCS-C02 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 SCS-C02 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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