- A
Enable S3 Block Public Access on both the bucket and the AWS account.
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.
- B
Continue using object ACLs so each customer invoice can be made public briefly.
Why wrong: ACLs are discouraged for modern S3 designs because they are harder to manage and easier to misconfigure. Brief public exposure also conflicts with the requirement to keep the bucket private.
- C
Configure Bucket owner enforced object ownership to disable ACLs.
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.
- D
Generate presigned URLs for customers to download specific invoices for a limited time.
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.
- E
Move the bucket to another AWS Region to isolate it from the internet.
Why wrong: 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.
Quick Answer
The correct answer is to generate presigned URLs for customers to download specific invoices for a limited time. This works because a presigned URL grants temporary access to a specific S3 object without altering the bucket’s underlying permissions; the bucket remains fully private with S3 Block Public Access enabled and ACLs disabled, while the URL itself embodes a time-limited signature that authenticates the request. On the SAA-C03 exam, this scenario tests your understanding of how to combine security controls—specifically, using S3 Block Public Access at both the bucket and account level to prevent any public exposure, while relying on presigned URLs for controlled, temporary access. A common trap is thinking you need to make objects public or use ACLs, but the correct approach is to keep everything private and issue time-bound URLs. Memory tip: think of a presigned URL as a “digital keycard” that expires—it opens one door for a short time without leaving the building unlocked.
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. A key principle to apply: s3 Block Public Access prevents public access at account or bucket level.. 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 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.
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.
Option A is correct because enabling S3 Block Public Access at both the bucket and account level ensures that no public access is 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.
Key principle: S3 Block Public Access prevents public access at account or bucket level.
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.
Related concept
S3 Block Public Access prevents public access at account or bucket level.
- ✗
Continue using object ACLs so each customer invoice can be made public briefly.
Why it's wrong here
ACLs are discouraged for modern S3 designs because they are harder to manage and easier to misconfigure. Brief public exposure also conflicts with the requirement to keep the bucket private.
- ✓
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.
Related concept
S3 Block Public Access prevents public access at account or bucket level.
- ✓
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.
Related concept
S3 Block Public Access prevents public access at account or bucket level.
- ✗
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think moving a bucket to a different region or making objects public briefly are valid solutions, but the exam tests the understanding that S3 Block Public Access and presigned URLs are the correct mechanisms for private, temporary access without ACLs.
Detailed technical explanation
How to think about this question
S3 Block Public Access settings are evaluated before any bucket policies or ACLs, effectively acting as a security override. Presigned URLs (Option D) use the bucket owner's IAM credentials to generate time-limited access to specific objects, which is ideal for providing temporary download links without making the bucket public. Bucket owner enforced object ownership (Option C) disables ACLs entirely, ensuring all objects are owned by the bucket owner and access is controlled solely via bucket policies and IAM.
KKey Concepts to Remember
- S3 Block Public Access prevents public access at account or bucket level.
- Block Public Access overrides bucket policies, ACLs, and access point policies.
- Presigned URLs grant temporary, time-limited access to private S3 objects.
- Presigned URLs use the creator's permissions to authorize object access.
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
S3 Block Public Access prevents public access at account or bucket level.
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
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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 — S3 Block Public Access prevents public access at account or bucket level..
What is the correct answer to this question?
The correct answer is: Enable S3 Block Public Access on both the bucket and the AWS account. — Option A is correct because enabling S3 Block Public Access at both the bucket and account level ensures that no public access is 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.
What should I do if I get this SAA-C03 question wrong?
Review s3 Block Public Access prevents public access at account or bucket level., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
S3 Block Public Access prevents public access at account or bucket level.
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Same concept, more angles
1 more ways this is tested on SAA-C03
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. 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.
medium- ✓ A.Enable S3 Block Public Access on both the bucket and the AWS account.
- B.Continue using object ACLs so each customer invoice can be made public briefly.
- ✓ C.Configure Bucket owner enforced object ownership to disable ACLs.
- ✓ D.Generate presigned URLs for customers to download specific invoices for a limited time.
- E.Move the bucket to another AWS Region to isolate it from the internet.
Why A: Option A is correct because 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.
Last reviewed: Jun 11, 2026
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.
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