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: kMS key policies are resource-based policies attached directly to a KMS key.. 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 order processing API with AWS KMS. Which two controls help prevent accidental use of the KMS key by unauthorized principals? 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
✓
A key policy that limits key administrators and key users
Option B is correct because a KMS key policy explicitly defines which principals (IAM users, roles, or AWS accounts) are allowed to administer or use the key. By restricting key users to only the required application roles, you prevent unauthorized principals from accidentally invoking KMS operations on the key, even if they have broad IAM permissions. This is a fundamental access control that does not require custom scripts.
Key principle: KMS key policies are resource-based policies attached directly to a KMS key.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
A larger KMS key rotation period
Why it's wrong here
Rotation interval does not determine which principals may use a key.
✓
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
KMS key policies are resource-based policies attached directly to a KMS 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
KMS key policies are resource-based policies attached directly to a KMS key.
✗
S3 Transfer Acceleration
Why it's wrong here
Transfer Acceleration does not control KMS key usage.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think key rotation (Option A) is a security control that prevents unauthorized use, but it only protects against compromised keys over time, not against accidental access by authorized-but-wrong principals.
Detailed technical explanation
How to think about this question
KMS key policies are resource-based policies that control access to the CMK itself, and they can be combined with IAM policies for granular control. The key policy's 'Effect: Deny' can be used to explicitly block actions from certain principals, but the question focuses on preventing accidental use, so limiting key users to specific roles (via 'kms:Decrypt' and 'kms:Encrypt' actions) is the primary control. IAM policies (Option C) also help by scoping permissions at the user/role level, but they are not sufficient alone if the key policy allows broad access.
KKey Concepts to Remember
KMS key policies are resource-based policies attached directly to a KMS key.
They define who can administer and who can use the KMS key.
A key policy is mandatory for every KMS key.
Key policies act as the primary access control mechanism for KMS keys, overriding IAM policies if more restrictive.
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
KMS key policies are resource-based policies attached directly to a KMS key.
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 kMS key policies are resource-based policies attached directly to a KMS key., then practise related SAA-C03 questions on the same topic to reinforce the concept.
Design Secure Architectures — This question tests Design Secure Architectures — KMS key policies are resource-based policies attached directly to a KMS key..
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 KMS key policy explicitly defines which principals (IAM users, roles, or AWS accounts) are allowed to administer or use the key. By restricting key users to only the required application roles, you prevent unauthorized principals from accidentally invoking KMS operations on the key, even if they have broad IAM permissions. This is a fundamental access control that does not require custom scripts.
What should I do if I get this SAA-C03 question wrong?
Review kMS key policies are resource-based policies attached directly to a KMS key., then practise related SAA-C03 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
KMS key policies are resource-based policies attached directly to a KMS key.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
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.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.