- A
Use an AWS Organizations service control policy to grant the role all needed permissions directly.
Why wrong: An SCP sets the maximum permissions an account can use, but it does not define a per-role ceiling that survives future policy attachment changes. It is the wrong tool for limiting an individual IAM role’s permissions boundary.
- B
Attach a permissions boundary to each role so the role can never exceed the approved ceiling.
A permissions boundary is specifically designed to cap the maximum permissions a role can ever receive, regardless of what identity-based policies are attached later. If a developer adds a broader managed policy or inline policy, the effective permissions still cannot exceed the boundary. This makes it the best fit for delegated role creation with a centrally approved ceiling.
- C
Use a resource-based policy on Amazon S3 to restrict the permissions that IAM roles can receive.
Why wrong: Resource policies control access to the resource they are attached to, not the maximum permissions a role can hold across AWS services. They do not provide a general guardrail for IAM role creation or future policy attachment.
- D
Require temporary STS session policies whenever the role is assumed.
Why wrong: Session policies can further reduce permissions for a specific session, but they depend on every caller behaving correctly each time the role is assumed. They are not a durable organizational ceiling for all future role sessions or policy attachments.
SAA-C03 Design Secure Architectures Practice Question
This SAA-C03 practice question tests your understanding of design secure architectures. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 platform team lets application teams create IAM roles in member accounts through Infrastructure as Code. Security says every new role must stay within a centrally approved permission ceiling, even if someone later attaches broader managed policies or inline policies. Which control should be used to enforce that maximum permission set?
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
Attach a permissions boundary to each role so the role can never exceed the approved ceiling.
A permissions boundary is an AWS IAM feature that sets the maximum permissions an IAM role can have. When attached to a role, any policy that grants permissions beyond the boundary is effectively ignored, ensuring the role cannot exceed the approved permission ceiling even if broader managed or inline policies are later attached. This directly enforces the security requirement without restricting the application teams' ability to create roles via Infrastructure as Code.
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.
- ✗
Use an AWS Organizations service control policy to grant the role all needed permissions directly.
Why it's wrong here
An SCP sets the maximum permissions an account can use, but it does not define a per-role ceiling that survives future policy attachment changes. It is the wrong tool for limiting an individual IAM role’s permissions boundary.
- ✓
Attach a permissions boundary to each role so the role can never exceed the approved ceiling.
Why this is correct
A permissions boundary is specifically designed to cap the maximum permissions a role can ever receive, regardless of what identity-based policies are attached later. If a developer adds a broader managed policy or inline policy, the effective permissions still cannot exceed the boundary. This makes it the best fit for delegated role creation with a centrally approved ceiling.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a resource-based policy on Amazon S3 to restrict the permissions that IAM roles can receive.
Why it's wrong here
Resource policies control access to the resource they are attached to, not the maximum permissions a role can hold across AWS services. They do not provide a general guardrail for IAM role creation or future policy attachment.
- ✗
Require temporary STS session policies whenever the role is assumed.
Why it's wrong here
Session policies can further reduce permissions for a specific session, but they depend on every caller behaving correctly each time the role is assumed. They are not a durable organizational ceiling for all future role sessions or policy attachments.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing service control policies (SCPs) with permissions boundaries: SCPs apply to all principals in an account and cannot be used to set a per-role permission ceiling, while permissions boundaries are specifically designed for that granular control.
Detailed technical explanation
How to think about this question
Permissions boundaries work by using an IAM policy (either AWS-managed or customer-managed) that defines the maximum set of permissions. When a role is assumed, the effective permissions are the intersection of the identity-based policies and the permissions boundary—any permission not in the boundary is denied. This is distinct from SCPs, which operate at the account level and cannot be scoped to individual roles, and from session policies, which only apply during temporary credential usage.
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
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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: Attach a permissions boundary to each role so the role can never exceed the approved ceiling. — A permissions boundary is an AWS IAM feature that sets the maximum permissions an IAM role can have. When attached to a role, any policy that grants permissions beyond the boundary is effectively ignored, ensuring the role cannot exceed the approved permission ceiling even if broader managed or inline policies are later attached. This directly enforces the security requirement without restricting the application teams' ability to create roles via Infrastructure as Code.
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
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