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. 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 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?
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 can explicitly deny access to any principal except the CloudFront distribution's origin access identity (OAI) or origin access control (OAC). This ensures that direct requests to the S3 bucket URL are rejected, forcing all traffic through CloudFront. The policy uses a condition like `aws:SourceArn` or `aws:SourceAccount` to restrict access to the CloudFront distribution's ARN, preventing bypass.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
Read the scenario before looking for a memorised answer.
✗
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
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think enabling S3 static website hosting or logging provides security, but these features actually create additional access points or only provide visibility, not access control.
Detailed technical explanation
How to think about this question
Under the hood, CloudFront uses Origin Access Control (OAC) to sign requests to the S3 origin with AWS Signature Version 4, allowing the bucket policy to verify the request came from CloudFront via the `aws:SourceArn` condition. Without OAC, the bucket policy must rely on the deprecated Origin Access Identity (OAI), which uses a special S3 user principal. In real-world scenarios, misconfigured bucket policies that allow `Principal: "*"` or fail to include the `aws:SourceArn` condition can leave the bucket publicly accessible even with CloudFront in front.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Design Secure Architectures — This question tests Design Secure Architectures — Read the scenario before looking for a memorised answer..
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 can explicitly deny access to any principal except the CloudFront distribution's origin access identity (OAI) or origin access control (OAC). This ensures that direct requests to the S3 bucket URL are rejected, forcing all traffic through CloudFront. The policy uses a condition like `aws:SourceArn` or `aws:SourceAccount` to restrict access to the CloudFront distribution's ARN, preventing bypass.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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