- A
Signed URLs or signed cookies with an expiration time of 1 hour
Signed URLs/cookies provide cryptographic, edge-enforced authorization for specific CloudFront resources and include an expiration timestamp. After expiry, CloudFront rejects requests (for example, with 403) without needing the origin to handle time-based authorization.
- B
A WAF rule that blocks requests without valid JWTs, without using signed URLs
Why wrong: WAF can inspect and block requests, but it is not the primary built-in CloudFront mechanism for time-limited, resource-scoped authorization. Implementing expiring per-user access with JWT validation via WAF is possible in some architectures, but it is not the most direct, native CloudFront feature described for this requirement.
- C
Turning on S3 bucket public access block, without any CloudFront viewer authentication
Why wrong: Blocking public access ensures the objects can’t be fetched directly from S3, but it does not automatically ensure only authenticated users can fetch via CloudFront. If the CloudFront distribution allows access (and the origin access/OAC configuration permits it), requests can still reach CloudFront without user authentication and without a 1-hour expiry control.
- D
Enabling CloudFront geo restriction to allow only one country
Why wrong: Geo restriction limits access by geographic location, not by user authentication and not by time-limited authorization. It does not provide expiring per-user/per-session access.
Quick Answer
The correct answer is signed URLs or signed cookies with an expiration time of 1 hour. CloudFront signed URLs grant temporary access to private S3 objects by embedding a cryptographic policy, signature, and key pair ID directly into the request, allowing you to control who can access your content and for how long. By setting the expiration timestamp in the policy to 1 hour, the URL automatically becomes invalid after that period, ensuring that only authenticated users can view each image without exposing the underlying S3 bucket publicly. On the SAA-C03 exam, this scenario tests your understanding of CloudFront’s origin access control and the distinction between signed URLs (for individual files) and signed cookies (for multiple files or group access). A common trap is confusing signed URLs with CloudFront’s OAI or OAC, which secure the origin but do not enforce per-user expiration. Remember the mnemonic: “Signed for single, cookies for collections, and always check the clock.”
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 company serves private images stored in S3 through Amazon CloudFront. Only authenticated users should be able to access each image, and access should expire after 1 hour. Which CloudFront feature best meets this 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 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
Signed URLs or signed cookies with an expiration time of 1 hour
Signed URLs or signed cookies allow CloudFront to grant temporary access to private content by embedding authentication information (policy, signature, key pair ID) directly in the request. By setting an expiration time of 1 hour in the policy statement, access automatically becomes invalid after that period, meeting both the authentication and expiry requirements without exposing the S3 bucket publicly.
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.
- ✓
Signed URLs or signed cookies with an expiration time of 1 hour
Why this is correct
Signed URLs/cookies provide cryptographic, edge-enforced authorization for specific CloudFront resources and include an expiration timestamp. After expiry, CloudFront rejects requests (for example, with 403) without needing the origin to handle time-based authorization.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
A WAF rule that blocks requests without valid JWTs, without using signed URLs
Why it's wrong here
WAF can inspect and block requests, but it is not the primary built-in CloudFront mechanism for time-limited, resource-scoped authorization. Implementing expiring per-user access with JWT validation via WAF is possible in some architectures, but it is not the most direct, native CloudFront feature described for this requirement.
- ✗
Turning on S3 bucket public access block, without any CloudFront viewer authentication
Why it's wrong here
Blocking public access ensures the objects can’t be fetched directly from S3, but it does not automatically ensure only authenticated users can fetch via CloudFront. If the CloudFront distribution allows access (and the origin access/OAC configuration permits it), requests can still reach CloudFront without user authentication and without a 1-hour expiry control.
- ✗
Enabling CloudFront geo restriction to allow only one country
Why it's wrong here
Geo restriction limits access by geographic location, not by user authentication and not by time-limited authorization. It does not provide expiring per-user/per-session access.
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 work at the S3 bucket level and do not leverage CloudFront's edge caching or origin access control, whereas CloudFront signed URLs are the correct feature for controlling access at the CDN edge with expiration.
Detailed technical explanation
How to think about this question
CloudFront signed URLs use a cryptographic signature generated with a CloudFront key pair (either trusted key group or legacy key pair) and a canned or custom policy that includes an expiration timestamp (epoch time). The signature is verified by CloudFront edge locations using the public key, and the expiration is enforced at the edge, meaning even if a URL is intercepted after expiry, it cannot be reused. A common real-world scenario is serving paywalled video content where each user gets a unique, time-limited URL that cannot be shared beyond the allowed window.
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: Signed URLs or signed cookies with an expiration time of 1 hour — Signed URLs or signed cookies allow CloudFront to grant temporary access to private content by embedding authentication information (policy, signature, key pair ID) directly in the request. By setting an expiration time of 1 hour in the policy statement, access automatically becomes invalid after that period, meeting both the authentication and expiry requirements without exposing the S3 bucket publicly.
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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Last reviewed: Jun 11, 2026
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