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 is encrypting sensitive S3 data for a healthcare document service with AWS KMS. Which two controls help prevent accidental use of the KMS key by unauthorized principals?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A key policy that limits key administrators and key users
Option B is correct because a key policy in AWS KMS explicitly defines which principals (users, roles, or AWS services) are allowed to use the key for cryptographic operations. By restricting key usage to specific key users, you prevent unauthorized principals—even those with broad IAM permissions—from accidentally invoking the key. This is a critical control for sensitive data like healthcare documents, where compliance requires strict access boundaries.
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.
✗
S3 Transfer Acceleration
Why it's wrong here
Transfer Acceleration does not control KMS key usage.
✓
A key policy that limits key administrators and key users
Why this is correct
The KMS key policy is the primary resource policy that controls who can administer or use the key.
Related concept
Read the scenario before looking for a memorised answer.
✗
A larger KMS key rotation period
Why it's wrong here
Rotation interval does not determine which principals may use a key.
✓
IAM policies that grant kms:Decrypt only to required application roles
Why this is correct
IAM permissions should grant least-privilege use of the KMS key to specific roles.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often overlook that key rotation settings (Option C) are about key lifecycle management, not access control, and confuse S3 Transfer Acceleration (Option A) with a security feature when it is purely a performance optimization.
Detailed technical explanation
How to think about this question
AWS KMS uses a combination of key policies (resource-based) and IAM policies (identity-based) to authorize use; both must be evaluated and allow the action for the principal to succeed. A key policy can explicitly deny all principals except those listed, effectively overriding any IAM permissions that might otherwise grant access. In practice, for healthcare workloads subject to HIPAA, you would combine a restrictive key policy with IAM policies that limit kms:Decrypt to specific application roles, ensuring that even if an S3 bucket policy accidentally grants broad access, the KMS key remains locked down.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: A key policy that limits key administrators and key users — Option B is correct because a key policy in AWS KMS explicitly defines which principals (users, roles, or AWS services) are allowed to use the key for cryptographic operations. By restricting key usage to specific key users, you prevent unauthorized principals—even those with broad IAM permissions—from accidentally invoking the key. This is a critical control for sensitive data like healthcare documents, where compliance requires strict access boundaries.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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