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 bucket policies grant permissions directly on the bucket resource.. 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 partner company needs read-only access to reports in an S3 bucket for a customer analytics portal. The partner has its own AWS account. What is the most secure scalable access pattern?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create a bucket policy that grants the partner role least-privilege access to the required prefix
Option B is correct because a bucket policy that grants the partner's IAM role (from the partner's AWS account) least-privilege access to a specific prefix is the most secure and scalable pattern. This uses cross-account IAM roles, avoiding long-term credentials and allowing the partner to manage their own users and permissions. The bucket policy explicitly trusts the partner's AWS account, and the partner assumes the role to access only the required objects, following the principle of least privilege.
Key principle: S3 bucket policies grant permissions directly on the bucket resource.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Make the objects public and rely on difficult-to-guess object names
Why it's wrong here
Security through obscurity is not an access-control strategy.
✓
Create a bucket policy that grants the partner role least-privilege access to the required prefix
Why this is correct
A resource policy can grant cross-account access to a specific external role and prefix.
Related concept
S3 bucket policies grant permissions directly on the bucket resource.
✗
Copy the objects to a public website bucket
Why it's wrong here
A public website bucket exposes data unnecessarily.
✗
Create an IAM user in the company account and share the access keys
Why it's wrong here
Long-term shared credentials are less secure and harder to govern.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Option D (sharing IAM user access keys) because it seems straightforward, but the exam tests the understanding that cross-account IAM roles are more secure and scalable than sharing static credentials.
Detailed technical explanation
How to think about this question
Under the hood, cross-account bucket policies use the `Principal` element with the partner's AWS account ID (e.g., `"Principal": { "AWS": "arn:aws:iam::PARTNER_ACCOUNT_ID:root" }`) and a `Condition` block to restrict access to a specific IAM role or user. The partner then uses AWS STS `AssumeRole` to obtain temporary credentials, which are automatically rotated and scoped to the permissions granted by the bucket policy. This pattern is recommended by AWS for multi-account access because it eliminates the need to manage static keys and allows centralized auditing via AWS CloudTrail.
KKey Concepts to Remember
S3 bucket policies grant permissions directly on the bucket resource.
Cross-account access is achieved by specifying an external IAM role's ARN in the policy.
Least privilege is enforced by restricting actions (e.g., `s3:GetObject`) and resources (e.g., specific prefixes).
IAM roles provide temporary credentials, eliminating the need to share long-term access keys.
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 bucket policies grant permissions directly on the bucket resource.
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.
Review s3 bucket policies grant permissions directly on the bucket resource., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Secure Architectures — This question tests Design Secure Architectures — S3 bucket policies grant permissions directly on the bucket resource..
What is the correct answer to this question?
The correct answer is: Create a bucket policy that grants the partner role least-privilege access to the required prefix — Option B is correct because a bucket policy that grants the partner's IAM role (from the partner's AWS account) least-privilege access to a specific prefix is the most secure and scalable pattern. This uses cross-account IAM roles, avoiding long-term credentials and allowing the partner to manage their own users and permissions. The bucket policy explicitly trusts the partner's AWS account, and the partner assumes the role to access only the required objects, following the principle of least privilege.
What should I do if I get this SAA-C03 question wrong?
Review s3 bucket policies grant permissions directly on the bucket resource., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
S3 bucket policies grant permissions directly on the bucket resource.
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