SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure 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: s3 bucket policies control access permissions to S3 buckets and objects.. 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 financial reporting platform uses CloudFront in front of an S3 origin. Which two settings help keep users from bypassing CloudFront and accessing the bucket directly? The design must avoid adding custom operational scripts.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an S3 bucket policy that allows access only from the CloudFront distribution
Option A is correct because an S3 bucket policy that explicitly denies access to any principal except the CloudFront distribution's origin access identity (OAI) or origin access control (OAC) ensures that direct requests to the S3 bucket endpoint are rejected. This policy leverages the aws:SourceArn or aws:SourceIp condition key to restrict access solely to CloudFront, preventing users from bypassing the CDN and hitting the bucket directly.
Key principle: S3 bucket policies control access permissions to S3 buckets and objects.
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 S3 bucket policy that allows access only from the CloudFront distribution
Why this is correct
The bucket policy should trust the CloudFront distribution and deny direct public access.
Related concept
S3 bucket policies control access permissions to S3 buckets and objects.
✗
Enable CloudFront standard logging
Why it's wrong here
Logging records requests but does not block direct S3 access.
✗
Enable S3 static website hosting
Why it's wrong here
Website hosting requires public-style access patterns and does not protect the origin.
✓
Configure Origin Access Control for the S3 origin
Why this is correct
Origin Access Control allows CloudFront to securely access a private S3 bucket.
Related concept
S3 bucket policies control access permissions to S3 buckets and objects.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse logging or static website hosting with security controls, not realizing that only explicit bucket policies or OAC/OAI configurations actually enforce the restriction to CloudFront traffic.
Detailed technical explanation
How to think about this question
Origin Access Control (OAC) uses AWS Signature Version 4 to sign requests from CloudFront to S3, providing a more secure alternative to the legacy OAI by supporting server-side encryption with KMS and fine-grained condition keys. When combined with an S3 bucket policy that only allows the CloudFront service principal (e.g., 'Principal': { 'Service': 'cloudfront.amazonaws.com' }) with a specific SourceArn, it ensures that even if someone discovers the bucket URL, they cannot read objects without going through CloudFront.
KKey Concepts to Remember
S3 bucket policies control access permissions to S3 buckets and objects.
CloudFront Origin Access Control (OAC) or Origin Access Identity (OAI) is used to secure S3 origins.
An S3 bucket policy can explicitly allow access only from a specific CloudFront distribution's OAC/OAI.
Denying 's3:GetObject' for principals other than the CloudFront OAC/OAI prevents direct S3 access.
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
S3 bucket policies control access permissions to S3 buckets and objects.
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 s3 bucket policies control access permissions to S3 buckets and objects., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Secure Architectures — This question tests Design Secure Architectures — S3 bucket policies control access permissions to S3 buckets and objects..
What is the correct answer to this question?
The correct answer is: Use an S3 bucket policy that allows access only from the CloudFront distribution — Option A is correct because an S3 bucket policy that explicitly denies access to any principal except the CloudFront distribution's origin access identity (OAI) or origin access control (OAC) ensures that direct requests to the S3 bucket endpoint are rejected. This policy leverages the aws:SourceArn or aws:SourceIp condition key to restrict access solely to CloudFront, preventing users from bypassing the CDN and hitting the bucket directly.
What should I do if I get this SAA-C03 question wrong?
Review s3 bucket policies control access permissions to S3 buckets and objects., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
S3 bucket policies control access permissions to S3 buckets and objects.
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