- A
Use CloudFront signed URLs or signed cookies with a one-hour expiration window.
CloudFront signed URLs or signed cookies enforce time-limited viewer authorization at the edge. For a one-hour access window, the distribution can issue a signature that CloudFront validates before it serves the object. Signed URLs are useful for a small number of object links, while signed cookies are better when the portal needs to grant access to multiple PDFs without generating a separate URL for each file.
- B
Configure an Origin Access Control for the S3 origin behind CloudFront.
Origin Access Control (OAC) lets CloudFront authenticate to S3 when retrieving objects, so the bucket does not need to be public. This is the standard way to keep the origin private while still allowing CloudFront to read the objects on behalf of viewers.
- C
Add an S3 bucket policy that allows only the CloudFront distribution, through its Origin Access Control, and denies public access.
The bucket policy should explicitly allow reads only from the CloudFront distribution and only when the request comes through the approved OAC path. Pairing that allow statement with Block Public Access and no public bucket ACLs prevents direct internet access to the origin and prevents bypassing CloudFront.
- D
Expose the S3 bucket through the static website endpoint and secure it with security group rules.
Why wrong: S3 static website endpoints are public endpoints and do not support security groups. They cannot be used to keep content private behind CloudFront or to enforce origin-only access from the distribution.
- E
Use an AWS WAF web ACL attached to the S3 bucket instead of CloudFront.
Why wrong: AWS WAF can protect supported front-door services such as CloudFront, but it cannot be attached to an S3 bucket. WAF also does not replace origin restriction; the S3 bucket still needs to be locked down so only CloudFront can fetch the objects.
Quick Answer
The answer is to use CloudFront signed URLs with a one-hour expiration, restrict the S3 bucket with an Origin Access Control (OAC) policy, and deny all direct public access to the bucket. This works because a CloudFront signed URL embeds a policy that specifies an expiration timestamp, so setting it to one hour ensures the link automatically expires after that window, while the OAC-based bucket policy ensures only the CloudFront distribution can reach the S3 origin, keeping it completely private. On the SAA-C03 exam, this scenario tests your understanding of combining signed URLs with origin access controls to enforce time-limited access without exposing the origin—a common trap is thinking a bucket policy alone suffices, but without OAC, the bucket remains vulnerable. Remember the memory tip: "Sign it, time it, lock it"—sign the URL, set the time limit, and lock the bucket to CloudFront only.
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 marketing portal serves private PDF files stored in Amazon S3 through CloudFront. Users authenticate to the portal first, and each download link must expire after one hour. The S3 origin must never be directly reachable from the internet. Which three actions should be used? Select three.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Clue:
"never"Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
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 signed URLs or signed cookies with a one-hour expiration window.
Option A is correct because CloudFront signed URLs or signed cookies allow you to restrict access to content for a specific time window. By setting the expiration to one hour, you ensure that each download link becomes invalid after that period, meeting the requirement for expiring links. This approach also keeps the S3 bucket private, as users must authenticate through CloudFront rather than accessing S3 directly.
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 CloudFront signed URLs or signed cookies with a one-hour expiration window.
Why this is correct
CloudFront signed URLs or signed cookies enforce time-limited viewer authorization at the edge. For a one-hour access window, the distribution can issue a signature that CloudFront validates before it serves the object. Signed URLs are useful for a small number of object links, while signed cookies are better when the portal needs to grant access to multiple PDFs without generating a separate URL for each file.
Clue confirmation
The clue words "first", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure an Origin Access Control for the S3 origin behind CloudFront.
Why this is correct
Origin Access Control (OAC) lets CloudFront authenticate to S3 when retrieving objects, so the bucket does not need to be public. This is the standard way to keep the origin private while still allowing CloudFront to read the objects on behalf of viewers.
Clue confirmation
The clue words "first", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Add an S3 bucket policy that allows only the CloudFront distribution, through its Origin Access Control, and denies public access.
Why this is correct
The bucket policy should explicitly allow reads only from the CloudFront distribution and only when the request comes through the approved OAC path. Pairing that allow statement with Block Public Access and no public bucket ACLs prevents direct internet access to the origin and prevents bypassing CloudFront.
Clue confirmation
The clue words "first", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Expose the S3 bucket through the static website endpoint and secure it with security group rules.
Why it's wrong here
S3 static website endpoints are public endpoints and do not support security groups. They cannot be used to keep content private behind CloudFront or to enforce origin-only access from the distribution.
- ✗
Use an AWS WAF web ACL attached to the S3 bucket instead of CloudFront.
Why it's wrong here
AWS WAF can protect supported front-door services such as CloudFront, but it cannot be attached to an S3 bucket. WAF also does not replace origin restriction; the S3 bucket still needs to be locked down so only CloudFront can fetch the objects.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse CloudFront signed URLs with S3 pre-signed URLs, but S3 pre-signed URLs would expose the bucket directly if not combined with OAC, and they do not inherently prevent direct internet access to the S3 origin.
Detailed technical explanation
How to think about this question
CloudFront signed URLs use a policy statement that includes a date condition (e.g., `DateLessThan` with an epoch timestamp) to enforce expiration. The signed URL is generated using a private key from a CloudFront key group, and the signature is computed with RSA-SHA1. Origin Access Control (OAC) replaces the older Origin Access Identity (OAI) and uses AWS Signature Version 4 to authenticate requests from CloudFront to S3, ensuring that only CloudFront can access the bucket. The bucket policy must explicitly allow the OAC principal and deny all other principals to block direct S3 access.
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.
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
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 CloudFront signed URLs or signed cookies with a one-hour expiration window. — Option A is correct because CloudFront signed URLs or signed cookies allow you to restrict access to content for a specific time window. By setting the expiration to one hour, you ensure that each download link becomes invalid after that period, meeting the requirement for expiring links. This approach also keeps the S3 bucket private, as users must authenticate through CloudFront rather than accessing S3 directly.
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: "first", "never". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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