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 resource-based permissions.. 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 B2B file exchange site. The partner has its own AWS account. What is the most secure scalable access pattern? The design must avoid adding custom operational scripts.
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 C is correct because it uses a bucket policy with a principal ARN for the partner's AWS account, granting read-only access to a specific prefix. This is secure (no public exposure), scalable (no per-user credentials to manage), and avoids custom scripts by leveraging native AWS IAM and S3 policy evaluation. The partner can use their own IAM roles to access the bucket without sharing long-term access keys.
Key principle: S3 bucket policies grant resource-based permissions.
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 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.
✓
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 resource-based permissions.
✗
Copy the objects to a public website bucket
Why it's wrong here
A public website bucket exposes data unnecessarily.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Option B (IAM user with shared keys) because it seems straightforward, but they overlook the security risk of long-term credentials and the operational burden of key rotation, which violates the 'most secure scalable' and 'avoid custom scripts' requirements.
Detailed technical explanation
How to think about this question
The bucket policy uses the `Principal` element with the partner's AWS account ID (e.g., `"AWS": "arn:aws:iam::PARTNER_ACCOUNT_ID:root"`) and a `Condition` block to restrict access to a specific prefix (e.g., `s3:prefix`). This leverages the AWS global condition keys and the S3 `StringLike` condition for path-based access control. Under the hood, S3 evaluates the bucket policy in conjunction with the requester's IAM permissions; the partner's role must also have an IAM policy allowing `s3:GetObject` on the same bucket ARN.
KKey Concepts to Remember
S3 bucket policies grant resource-based permissions.
Bucket policies support cross-account access using external IAM roles.
Least privilege is enforced by restricting actions (e.g., s3:GetObject) and resources (e.g., specific prefixes).
Cross-account access via roles avoids sharing long-term credentials.
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 resource-based permissions.
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 resource-based permissions., 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 resource-based permissions..
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 C is correct because it uses a bucket policy with a principal ARN for the partner's AWS account, granting read-only access to a specific prefix. This is secure (no public exposure), scalable (no per-user credentials to manage), and avoids custom scripts by leveraging native AWS IAM and S3 policy evaluation. The partner can use their own IAM roles to access the bucket without sharing long-term access keys.
What should I do if I get this SAA-C03 question wrong?
Review s3 bucket policies grant resource-based permissions., 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 resource-based permissions.
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