- A
Keep the bucket public and rely on signed cookies for all thumbnail requests.
Why wrong: Making the bucket public increases exposure and signed cookies are not an origin access control mechanism.
- B
Use CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) and update the bucket policy to allow only CloudFront.
OAC/OAI ensures only CloudFront can access the bucket while keeping the bucket private.
- C
Enable S3 static website hosting so users access thumbnails directly from the S3 website endpoint.
Why wrong: S3 website endpoints are intended for public access patterns and bypass the security goal.
- D
Set S3 bucket permissions to allow all IAM users and block access only by using a WAF rule at CloudFront.
Why wrong: IAM-wide access contradicts least privilege, and WAF does not secure direct S3 access paths.
Quick Answer
The answer is to use CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) and update the S3 bucket policy to allow only that CloudFront identity. This works because OAC/OAI creates a special CloudFront principal that the bucket policy can reference with an `s3:GetObject` permission, while a default Deny on all other principals effectively blocks any direct requests to the S3 endpoint. On the SAA-C03 exam, this scenario tests your understanding of how to enforce a trusted access pattern between CloudFront and S3, often appearing as a distractor with options like pre-signed URLs or bucket ACLs—neither of which prevent direct access the way a policy-based restriction does. A common trap is forgetting that the bucket policy must explicitly grant access to the CloudFront identity, not just the CloudFront service itself. Memory tip: think of OAC as a “bouncer” that only lets CloudFront through the S3 door, turning away everyone else.
SAA-C03 Design High-Performing Architectures Practice Question
This SAA-C03 practice question tests your understanding of design high-performing architectures. 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. A key principle to apply: oAC/OAI creates a special CloudFront principal for S3 access.. 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 media company uses CloudFront in front of an S3 bucket origin for video thumbnails. They want to prevent users from bypassing CloudFront and accessing the S3 bucket directly, while still allowing CloudFront to fetch objects. What is the best option?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) and update the bucket policy to allow only CloudFront.
Option B is correct because CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) allows you to create a special CloudFront identity and attach a bucket policy that grants that identity s3:GetObject permissions. This ensures that only CloudFront can fetch objects from the S3 bucket, while direct access via the S3 endpoint is denied, preventing users from bypassing CloudFront.
Key principle: OAC/OAI creates a special CloudFront principal for S3 access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Keep the bucket public and rely on signed cookies for all thumbnail requests.
Why it's wrong here
Making the bucket public increases exposure and signed cookies are not an origin access control mechanism.
- ✓
Use CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) and update the bucket policy to allow only CloudFront.
Why this is correct
OAC/OAI ensures only CloudFront can access the bucket while keeping the bucket private.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
OAC/OAI creates a special CloudFront principal for S3 access.
- ✗
Enable S3 static website hosting so users access thumbnails directly from the S3 website endpoint.
Why it's wrong here
S3 website endpoints are intended for public access patterns and bypass the security goal.
- ✗
Set S3 bucket permissions to allow all IAM users and block access only by using a WAF rule at CloudFront.
Why it's wrong here
IAM-wide access contradicts least privilege, and WAF does not secure direct S3 access paths.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think signed cookies or WAF rules can restrict direct S3 access, but they fail to realize that those mechanisms only apply at the CloudFront layer and do not affect the S3 bucket's own permissions.
Detailed technical explanation
How to think about this question
Under the hood, OAC (the newer, recommended method) uses AWS Signature Version 4 to sign requests from CloudFront to S3, providing enhanced security over OAI. In a real-world scenario, if the bucket policy explicitly denies all principals except the CloudFront OAI/OAC ARN, any direct request to the S3 bucket (even with valid AWS credentials) will be rejected, ensuring that all traffic must pass through CloudFront for caching, logging, and security controls.
KKey Concepts to Remember
- OAC/OAI creates a special CloudFront principal for S3 access.
- S3 bucket policy is updated to allow only the OAC/OAI principal.
- Prevents direct S3 bucket access, forcing traffic through CloudFront.
- OAC is the recommended and more secure successor to OAI.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
OAC/OAI creates a special CloudFront principal for S3 access.
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 oAC/OAI creates a special CloudFront principal for S3 access., then practise related SAA-C03 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design High-Performing Architectures — This question tests Design High-Performing Architectures — OAC/OAI creates a special CloudFront principal for S3 access..
What is the correct answer to this question?
The correct answer is: Use CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) and update the bucket policy to allow only CloudFront. — Option B is correct because CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) allows you to create a special CloudFront identity and attach a bucket policy that grants that identity s3:GetObject permissions. This ensures that only CloudFront can fetch objects from the S3 bucket, while direct access via the S3 endpoint is denied, preventing users from bypassing CloudFront.
What should I do if I get this SAA-C03 question wrong?
Review oAC/OAI creates a special CloudFront principal for S3 access., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
OAC/OAI creates a special CloudFront principal for S3 access.
About these practice questions
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Same concept, more angles
1 more ways this is tested on SAA-C03
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A media company uses CloudFront in front of an S3 bucket origin for video thumbnails. They want to prevent users from bypassing CloudFront and accessing the S3 bucket directly, while still allowing CloudFront to fetch objects. What is the best option?
easy- A.Keep the bucket public and rely on signed cookies for all thumbnail requests.
- ✓ B.Use CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) and update the bucket policy to allow only CloudFront.
- C.Enable S3 static website hosting so users access thumbnails directly from the S3 website endpoint.
- D.Set S3 bucket permissions to allow all IAM users and block access only by using a WAF rule at CloudFront.
Why B: CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) allows you to restrict direct access to an S3 bucket by configuring the bucket policy to grant read permissions only to the CloudFront distribution's service principal. This ensures that users can only retrieve thumbnails through CloudFront, leveraging its caching and security features, while blocking any direct S3 requests.
Last reviewed: Jun 11, 2026
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.
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