- A
Create an IAM user for each developer and keep the existing broad permissions, rotating keys every 90 days.
Why wrong: Long-lived IAM user access contradicts temporary credentials requirements. Rotating keys reduces exposure but does not prevent repeated leakage or enforce least privilege at scale.
- B
Use an IAM role that developers assume for deployments; attach least-privilege policies for ECS and Auto Scaling; and attach a permission boundary that does not allow iam:* actions, so additional inline or managed policies cannot grant IAM permissions.
Assuming a role provides temporary credentials and removes long-lived keys. Least-privilege policies limit allowed actions, and a permission boundary caps the role's effective permissions so IAM actions cannot be gained through later policy changes.
- C
Attach a policy that allows ecs:* and autoscaling:* and rely on developers to self-review that no IAM statements are added to their roles.
Why wrong: Self-review is not an enforceable control. Without a permission boundary or explicit deny, developers could add iam:* permissions and violate the security requirement.
- D
Create a single shared IAM role with full administrator permissions so developers can troubleshoot faster when deployments fail.
Why wrong: Administrator permissions violate least-privilege and allow IAM changes. A shared role also makes accountability weaker and increases blast radius of mistakes.
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 retail company lets developers deploy ECS services but they must never be able to modify IAM. The team currently uses an IAM user per developer with an admin-like policy, and several access keys have been leaked. You are asked to redesign access so that: (1) developers authenticate with temporary credentials, (2) they can create/update ECS services and related autoscaling resources, and (3) IAM changes are impossible even if a developer tries to attach new policies.
Which design best meets all requirements?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Clue:
"never"Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
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
Use an IAM role that developers assume for deployments; attach least-privilege policies for ECS and Auto Scaling; and attach a permission boundary that does not allow iam:* actions, so additional inline or managed policies cannot grant IAM permissions.
Option B is correct because it uses an IAM role with temporary credentials (via AWS STS AssumeRole), satisfying the requirement that developers never have long-term access keys. The least-privilege policies restrict actions to ECS and Auto Scaling only, and the permission boundary explicitly denies iam:* actions, preventing developers from escalating privileges by attaching new policies to their role. This combination ensures developers can deploy ECS services but cannot modify IAM in any way.
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.
- ✗
Create an IAM user for each developer and keep the existing broad permissions, rotating keys every 90 days.
Why it's wrong here
Long-lived IAM user access contradicts temporary credentials requirements. Rotating keys reduces exposure but does not prevent repeated leakage or enforce least privilege at scale.
- ✓
Use an IAM role that developers assume for deployments; attach least-privilege policies for ECS and Auto Scaling; and attach a permission boundary that does not allow iam:* actions, so additional inline or managed policies cannot grant IAM permissions.
Why this is correct
Assuming a role provides temporary credentials and removes long-lived keys. Least-privilege policies limit allowed actions, and a permission boundary caps the role's effective permissions so IAM actions cannot be gained through later policy changes.
Clue confirmation
The clue words "best", "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Attach a policy that allows ecs:* and autoscaling:* and rely on developers to self-review that no IAM statements are added to their roles.
Why it's wrong here
Self-review is not an enforceable control. Without a permission boundary or explicit deny, developers could add iam:* permissions and violate the security requirement.
- ✗
Create a single shared IAM role with full administrator permissions so developers can troubleshoot faster when deployments fail.
Why it's wrong here
Administrator permissions violate least-privilege and allow IAM changes. A shared role also makes accountability weaker and increases blast radius of mistakes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think a permission boundary is optional or that denying iam:* actions in a policy is sufficient, but without a boundary, a developer could attach a new policy that grants iam:* actions, bypassing the deny—the boundary is required to cap permissions at the role level.
Detailed technical explanation
How to think about this question
Permission boundaries in IAM act as a maximum permissions envelope—even if a developer attaches a policy that grants iam:* actions, the boundary overrides and denies those actions because the effective permissions are the intersection of the identity-based policy and the boundary. AWS STS temporary credentials (via AssumeRole) have a configurable expiration (default 1 hour, max 12 hours) and eliminate the risk of leaked long-term keys. In real-world scenarios, this pattern is often combined with AWS CloudTrail monitoring to detect any unauthorized attempts to modify IAM, providing an additional audit layer.
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
Got this wrong? Here's your next step.
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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: Use an IAM role that developers assume for deployments; attach least-privilege policies for ECS and Auto Scaling; and attach a permission boundary that does not allow iam:* actions, so additional inline or managed policies cannot grant IAM permissions. — Option B is correct because it uses an IAM role with temporary credentials (via AWS STS AssumeRole), satisfying the requirement that developers never have long-term access keys. The least-privilege policies restrict actions to ECS and Auto Scaling only, and the permission boundary explicitly denies iam:* actions, preventing developers from escalating privileges by attaching new policies to their role. This combination ensures developers can deploy ECS services but cannot modify IAM in any way.
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.
Are there clue words in this question I should notice?
Yes — watch for: "best", "never". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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