- A
The request succeeds because the IAM policy explicitly allows kms:Decrypt
Why wrong: In Organizations, an SCP sets permission guardrails at the account/OU level. An explicit Deny in an SCP prevents the action, even if the member account’s IAM identity or resource policies would otherwise allow it.
- B
The request is denied because the SCP explicit deny overrides IAM allows
SCPs are evaluated as a permissions filter for the member account. When an SCP contains an explicit Deny matching kms:Decrypt, that Deny takes precedence over any IAM Allow decisions in the account, and the action is blocked.
- C
The request succeeds, but only when using the KMS key policy to allow the user
Why wrong: Whether the KMS key policy allows the user is separate from the Organizations authorization filter. Even if the key policy would allow kms:Decrypt, the SCP’s explicit deny blocks the request at a higher level in the authorization flow.
- D
The request succeeds for read-only actions and fails only for writes
Why wrong: SCP evaluation is based on the action specified in the policy (kms:Decrypt here), not on whether the action is considered “read-like.” kms:Decrypt is explicitly denied, so it fails.
Quick Answer
The answer is that the request is denied because an SCP explicit deny overrides any IAM allow. This occurs because Service Control Policies (SCPs) in AWS Organizations act as a permission guardrail, setting the maximum effective permissions for all accounts within an Organizational Unit (OU). Even if an IAM policy explicitly grants kms:Decrypt to a user, an SCP that explicitly denies that same action takes absolute precedence, following the fundamental AWS authorization logic where an explicit deny always overrides any allow. On the SAA-C03 exam, this concept tests your understanding of how SCPs differ from IAM policies—they are not additive but restrictive, and they apply to all principals in the account, including the root user. A common trap is assuming an IAM allow can bypass an SCP deny, but remember the mnemonic: “SCP sets the ceiling, IAM sets the floor; an explicit deny in the ceiling crushes any floor.”
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.
Your AWS Organizations environment has an SCP that explicitly denies kms:Decrypt for principals in the Production OU. A member account IAM policy for a user grants kms:Decrypt on the required KMS key. If that user attempts kms:Decrypt, what happens?
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
The request is denied because the SCP explicit deny overrides IAM allows
In AWS Organizations, Service Control Policies (SCPs) act as a guardrail that sets the maximum available permissions for all accounts in an OU. An explicit deny in an SCP overrides any allow in an IAM policy, even if the IAM policy explicitly grants the action. Therefore, the user's kms:Decrypt request is denied because the SCP's explicit deny takes precedence over the IAM allow.
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.
- ✗
The request succeeds because the IAM policy explicitly allows kms:Decrypt
Why it's wrong here
In Organizations, an SCP sets permission guardrails at the account/OU level. An explicit Deny in an SCP prevents the action, even if the member account’s IAM identity or resource policies would otherwise allow it.
- ✓
The request is denied because the SCP explicit deny overrides IAM allows
Why this is correct
SCPs are evaluated as a permissions filter for the member account. When an SCP contains an explicit Deny matching kms:Decrypt, that Deny takes precedence over any IAM Allow decisions in the account, and the action is blocked.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The request succeeds, but only when using the KMS key policy to allow the user
Why it's wrong here
Whether the KMS key policy allows the user is separate from the Organizations authorization filter. Even if the key policy would allow kms:Decrypt, the SCP’s explicit deny blocks the request at a higher level in the authorization flow.
- ✗
The request succeeds for read-only actions and fails only for writes
Why it's wrong here
SCP evaluation is based on the action specified in the policy (kms:Decrypt here), not on whether the action is considered “read-like.” kms:Decrypt is explicitly denied, so it fails.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume IAM policy allows are sufficient, forgetting that SCPs act as a higher-level permission boundary that can override those allows with an explicit deny.
Detailed technical explanation
How to think about this question
Under the hood, AWS evaluates authorization in a multi-step process: first, SCPs are evaluated (if an explicit deny exists, the request is denied immediately), then IAM policies and resource-based policies are evaluated. This means SCPs can effectively 'block' permissions even if IAM and key policies allow them, which is critical for enforcing compliance boundaries across accounts in an organization. A real-world scenario is a security team using SCPs to prevent production accounts from decrypting sensitive data, ensuring that even account administrators cannot bypass the restriction.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The request is denied because the SCP explicit deny overrides IAM allows — In AWS Organizations, Service Control Policies (SCPs) act as a guardrail that sets the maximum available permissions for all accounts in an OU. An explicit deny in an SCP overrides any allow in an IAM policy, even if the IAM policy explicitly grants the action. Therefore, the user's kms:Decrypt request is denied because the SCP's explicit deny takes precedence over the IAM allow.
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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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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