This SCS-C02 practice question tests your understanding of infrastructure security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 wants to restrict access to an S3 bucket so that only requests from a specific VPC endpoint are allowed. The bucket policy must deny all requests that do not come from the VPC endpoint. Which TWO statements are true for this configuration?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use the aws:SourceVpce condition key in the bucket policy.
The aws:SourceVpce condition key restricts requests to a specific VPC endpoint. The Principal must be '*' to apply to all principals, and the Effect Deny ensures non-VPC endpoint requests are blocked.
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 the aws:SourceIp condition key to restrict IP addresses.
Why it's wrong here
VPC endpoint requests come from private IPs, not public IPs; SourceIp not effective.
✗
Set the Principal to the VPC endpoint ID.
Why it's wrong here
Principal must be '*' because VPC endpoint ID is not a principal.
✓
Use the aws:SourceVpce condition key in the bucket policy.
Why this is correct
This key restricts access to a specific VPC endpoint.
Related concept
Standard ACLs match source addresses.
✓
Set the Effect to Deny and include a condition for the VPC endpoint.
Why this is correct
Deny effect with condition blocks requests not from the endpoint.
Related concept
Standard ACLs match source addresses.
✗
Ensure the bucket policy has an explicit Allow for the VPC endpoint.
Why it's wrong here
An explicit Allow is not required if the Deny blocks all others and a default Allow exists.
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.
Infrastructure Security — This question tests Infrastructure Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Use the aws:SourceVpce condition key in the bucket policy. — The aws:SourceVpce condition key restricts requests to a specific VPC endpoint. The Principal must be '*' to apply to all principals, and the Effect Deny ensures non-VPC endpoint requests are blocked.
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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