The answer is to configure CloudFront Origin Access Control for the S3 origin and update the bucket policy to allow only that distribution. This works because OAC uses a unique CloudFront identity to sign requests to S3, and the bucket policy can explicitly deny any request that does not come from that signed identity, effectively blocking direct S3 object URLs while still permitting CloudFront to fetch the files securely. On the SAA-C03 exam, this scenario tests your understanding of how to enforce a secure, private origin without using public S3 access or complex presigned URLs; a common trap is confusing OAC with the older Origin Access Identity (OAI), which lacks support for features like cross-region origins and fine-grained controls. Remember the key distinction: OAC uses a signed request with a specific service principal, whereas OAI relies on a legacy canonical user ID. Memory tip: think “OAC signs, OAI assigns”—the signature is what blocks direct access.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. 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.
Exhibit
{
"current_state": {
"bucket_public_access_block": true,
"bucket_policy": "Allows s3:GetObject to Principal * for debugging",
"cloudfront_distribution": "d123example.cloudfront.net",
"direct_s3_test": "https://secure-pdfs-prod.s3.us-east-1.amazonaws.com/manuals/q4.pdf returns 200"
}
}
Based on the exhibit, a company stores sensitive PDFs in S3 and serves them through CloudFront. Direct requests to the S3 object URL must fail, but CloudFront should still be able to fetch the files securely. Which solution best satisfies the requirement?
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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure CloudFront Origin Access Control for the S3 origin and update the bucket policy to allow only that distribution.
Option C is correct because CloudFront Origin Access Control (OAC) allows CloudFront to authenticate requests to an S3 origin using a specific identity, and the bucket policy can be configured to grant access only to that CloudFront distribution. This ensures that direct S3 object URL requests fail (since they lack the CloudFront signature), while CloudFront can still fetch the files securely using the OAC mechanism.
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.
✗
Leave the bucket public but require CloudFront signed cookies for all users.
Why it's wrong here
Signed cookies protect CloudFront access, but they do not stop direct S3 URL access if the bucket is public.
✗
Use an S3 access point and give it a public policy so CloudFront can reach the objects.
Why it's wrong here
A public access point does not satisfy the requirement to block direct access to the objects.
✓
Configure CloudFront Origin Access Control for the S3 origin and update the bucket policy to allow only that distribution.
Why this is correct
OAC lets CloudFront sign origin requests to S3, while the bucket policy can deny all other principals and block direct URL access.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use S3 object ACLs to grant read access only to users behind CloudFront.
Why it's wrong here
S3 ACLs cannot identify CloudFront as a protected origin consumer in the secure, modern way required here.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse signed URLs/cookies (which control user access) with origin access controls (which control how CloudFront fetches from S3), leading them to pick options that still allow direct S3 access.
Detailed technical explanation
How to think about this question
CloudFront Origin Access Control (OAC) uses a signature-based authentication mechanism where CloudFront signs requests to S3 using its own credentials, and the bucket policy must explicitly allow the CloudFront distribution's OAC ID. This replaces the older Origin Access Identity (OAI) and supports features like cross-region buckets and AWS KMS encryption. In practice, the bucket policy uses a condition like `Principal: { "Service": "cloudfront.amazonaws.com" }` with the distribution's ARN to enforce that only CloudFront can access the objects.
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: Configure CloudFront Origin Access Control for the S3 origin and update the bucket policy to allow only that distribution. — Option C is correct because CloudFront Origin Access Control (OAC) allows CloudFront to authenticate requests to an S3 origin using a specific identity, and the bucket policy can be configured to grant access only to that CloudFront distribution. This ensures that direct S3 object URL requests fail (since they lack the CloudFront signature), while CloudFront can still fetch the files securely using the OAC mechanism.
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.
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?
Read the scenario before looking for a memorised answer.
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Question Discussion
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