SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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 uses Amazon CloudFront to serve content from an S3 bucket. The bucket is configured as an origin with Origin Access Control (OAC). Users report that they can access the content via CloudFront but also directly via the S3 bucket URL. How can the company restrict direct access to the S3 bucket?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Update the S3 bucket policy to deny access to any principal other than the CloudFront service.
Option A is correct because an S3 bucket policy that denies all access except when the request includes a specific CloudFront header (via OAC) or is from the CloudFront service principal is the standard way to restrict direct access. Option B is wrong because removing the bucket policy would make the bucket public if ACLs allow, but OAC requires a bucket policy to allow CloudFront access. Option C is wrong because using a pre-signed URL is for temporary access, not for blocking direct access. Option D is wrong because OAC already restricts access to CloudFront only; the bucket policy must explicitly deny all other principals.
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.
✗
Disable OAC and use Origin Access Identity (OAI) instead.
Why it's wrong here
OAI also requires a bucket policy; simply switching does not block direct access without a proper policy.
✗
Use pre-signed URLs for all S3 requests.
Why it's wrong here
Pre-signed URLs grant temporary access but do not block direct access; users could still access the bucket directly if permissions allow.
✗
Remove the bucket policy and rely on ACLs.
Why it's wrong here
OAC requires a bucket policy to allow CloudFront access; removing it would break CloudFront access or make the bucket public.
✓
Update the S3 bucket policy to deny access to any principal other than the CloudFront service.
Why this is correct
This ensures only CloudFront can access the bucket, blocking direct S3 URLs.
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 SOA-C02 ACL questions on filtering logic and placement.
Networking and Content Delivery — This question tests Networking and Content Delivery — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Update the S3 bucket policy to deny access to any principal other than the CloudFront service. — Option A is correct because an S3 bucket policy that denies all access except when the request includes a specific CloudFront header (via OAC) or is from the CloudFront service principal is the standard way to restrict direct access. Option B is wrong because removing the bucket policy would make the bucket public if ACLs allow, but OAC requires a bucket policy to allow CloudFront access. Option C is wrong because using a pre-signed URL is for temporary access, not for blocking direct access. Option D is wrong because OAC already restricts access to CloudFront only; the bucket policy must explicitly deny all other principals.
What should I do if I get this SOA-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 SOA-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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