The answer is that S3 Block Public Access settings are the most likely cause of the 403 Access Denied errors, because these settings can override a bucket policy that explicitly grants access to a CloudFront origin access identity (OAI). Even when the bucket policy is correctly configured to allow the OAI, S3 Block Public Access acts as a higher-priority security layer that denies all public or cross-account access, including requests from CloudFront using an OAI. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of how S3 security controls interact—specifically, that bucket policies and Block Public Access settings are evaluated separately, and the most restrictive setting wins. A common trap is assuming a correct OAI ARN or distribution domain name is sufficient, but the real culprit is often an overlooked Block Public Access configuration. Memory tip: think of Block Public Access as the “master kill switch” that overrides any permissive bucket policy.
SOA-C02 Networking and Content Delivery Practice Question
This SOA-C02 practice question tests your understanding of networking and content delivery. 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.
Refer to the exhibit. A SysOps administrator created this S3 bucket policy to allow CloudFront to access objects in the bucket using an origin access identity (OAI). However, users are still receiving 403 Access Denied errors when accessing the CloudFront distribution. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The S3 bucket has Block Public Access settings enabled that deny all access
Option B is correct because the bucket policy only grants read access to the OAI, but if the bucket itself has Block Public Access settings enabled, it can override the policy and deny access. Option A is wrong because the OAI ARN is correctly formatted. Option C is wrong because CloudFront can use the OAI with S3 regardless of region. Option D is wrong because the distribution domain name does not affect the OAI access.
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.
✗
The CloudFront distribution uses the S3 bucket's regional domain name instead of the distribution domain name
Why it's wrong here
The distribution domain name is used by users; the OAI is configured at the origin level.
✗
The CloudFront distribution is in a different region than the S3 bucket
Why it's wrong here
CloudFront works with S3 buckets in any region.
✓
The S3 bucket has Block Public Access settings enabled that deny all access
Why this is correct
Block Public Access can override bucket policies and deny access even to authorized principals.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The OAI ARN in the policy is incorrect
Why it's wrong here
The ARN format appears correct.
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: The S3 bucket has Block Public Access settings enabled that deny all access — Option B is correct because the bucket policy only grants read access to the OAI, but if the bucket itself has Block Public Access settings enabled, it can override the policy and deny access. Option A is wrong because the OAI ARN is correctly formatted. Option C is wrong because CloudFront can use the OAI with S3 regardless of region. Option D is wrong because the distribution domain name does not affect the OAI access.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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