SAA-C03 Design Secure Architectures Practice Question
A company stores customer invoices in an Amazon S3 bucket. The application must keep the bucket private, ACLs should not be used, and customers should receive temporary download links for individual invoices. Which three changes should the architect make? Select three.
⚠ Common exam trap
The trap here is that candidates might think moving the bucket to a different region or using ACLs can solve the temporary access requirement, but they overlook that S3 Block Public Access and presigned URLs are the correct mechanisms for private, time-limited access without ACLs.
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
✓
Enable S3 Block Public Access on both the bucket and the AWS account.
Enabling S3 Block Public Access at both the bucket and account level ensures that no public access can be granted to the bucket or its objects, which aligns with the requirement to keep the bucket private. This setting overrides any other permissions that might inadvertently allow public access, providing a strong security baseline.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Enable S3 Block Public Access on both the bucket and the AWS account.
Why this is correct
Block Public Access prevents accidental public exposure through bucket policies, ACLs, and other public settings. It is a strong baseline control when the data must remain private.
- ✗
Continue using object ACLs so each customer invoice can be made public briefly.
Why it's wrong here
Object ACLs would expose individual objects to public read access, violating the requirement to keep the bucket private and to avoid using ACLs entirely. The scenario demands temporary, pre-signed URLs that grant time-limited access without altering the object’s default private state. This option is tempting because object ACLs can make a single file publicly readable for a period, which superficially resembles granting temporary access, but they permanently change the object’s permission until manually reverted, failing the need for ephemeral, revocable links.
When this WOULD be correct
In a scenario where the company needs to grant temporary public access to individual objects without requiring authentication, and the use of ACLs is permitted, making objects public via ACLs could be a simple solution, though presigned URLs are generally preferred.
- ✓
Configure Bucket owner enforced object ownership to disable ACLs.
Why this is correct
Bucket owner enforced turns off ACL-based access control and makes the bucket owner own every object. That simplifies governance and aligns with the requirement to avoid ACLs.
- ✓
Generate presigned URLs for customers to download specific invoices for a limited time.
Why this is correct
Presigned URLs provide temporary access to a single object without making the bucket public. They are ideal for time-limited downloads where you want controlled external sharing.
- ✗
Move the bucket to another AWS Region to isolate it from the internet.
Why it's wrong here
Changing Regions does not make S3 private and does not solve access control problems. Privacy depends on policies and public access controls, not physical Region placement.
When this WOULD be correct
If the question required compliance with data residency laws (e.g., data must remain within a specific geographic boundary) or reducing latency for users in a particular region, moving the bucket to that region would be correct.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The SAA-C03 exam frequently reuses these exact scenarios with slightly different constraints.
✓Enable S3 Block Public Access on both the bucket and the AWS account.Correct answer▾
Why this is correct
Block Public Access prevents accidental public exposure through bucket policies, ACLs, and other public settings. It is a strong baseline control when the data must remain private.
✗Continue using object ACLs so each customer invoice can be made public briefly.Wrong answer — click to see why▾
Why this is wrong here
The requirement explicitly states 'ACLs should not be used,' so continuing to use object ACLs violates that constraint. Additionally, making objects public briefly is insecure and does not provide temporary download links.
★ When this WOULD be the correct answer
In a scenario where the company needs to grant temporary public access to individual objects without requiring authentication, and the use of ACLs is permitted, making objects public via ACLs could be a simple solution, though presigned URLs are generally preferred.
Why candidates choose this
Candidates may think that making objects public via ACLs is a quick way to provide access, overlooking the explicit prohibition of ACLs and the security risks of public exposure.
✗Move the bucket to another AWS Region to isolate it from the internet.Wrong answer — click to see why▾
Why this is wrong here
Moving the bucket to another AWS Region does not isolate it from the internet; S3 buckets are accessible over the internet regardless of region. The requirement is to keep the bucket private and provide temporary download links, which is unrelated to region placement.
★ When this WOULD be the correct answer
If the question required compliance with data residency laws (e.g., data must remain within a specific geographic boundary) or reducing latency for users in a particular region, moving the bucket to that region would be correct.
Why candidates choose this
Candidates may mistakenly think that changing the region can restrict internet access or enhance security, confusing geographic isolation with network access control.
Analysis generated from the official SAA-C03blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
Go deeper
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About these practice questions
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SAA-C03 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SAA-C03 exam.