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Question 934 of 1,748

Management and Security Governance →hardMultiple ChoiceObjective-mapped

SCS-C02 Management and Security Governance Practice Question

This SCS-C02 practice question tests your understanding of management and security governance. 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 company uses AWS Organizations with multiple accounts. The security team wants to prevent members of the 'Developers' group from modifying IAM roles in any account. What is the most effective way to enforce this restriction?

A
Apply a service control policy (SCP) that denies IAM role modification actions to all accounts in the organization.
An SCP applied to the organization can deny IAM role modifications across all accounts, and it cannot be overridden by account-level permissions, making it the most effective preventive control.
B
Attach an IAM policy to the Developers group in the management account that denies IAM actions.
Why wrong: An IAM policy attached to the Developers group in the management account only applies to users in that account, not to users in member accounts.
C
Use AWS Config to detect IAM role modifications and automatically revert them.
Why wrong: AWS Config can detect and automatically revert changes, but it is a detective/reactive control, not a preventive one.
D
Create a cross-account role in each member account that denies IAM actions.
Why wrong: A cross-account role grants access from one account to another, but it does not prevent users in a member account from modifying IAM roles in their own account.

Full breakdown with real-world context →

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

✓

Apply a service control policy (SCP) that denies IAM role modification actions to all accounts in the organization.

Option A is correct because a service control policy (SCP) applied to the organization root or to all accounts can deny IAM role modification actions (e.g., iam:CreateRole, iam:UpdateAssumeRolePolicy) for all principals in member accounts. SCPs are effective because they are applied at the organization level and cannot be overridden by account-level permissions, even for administrators. Option B is incorrect because an IAM policy attached to a group in the management account only affects users in that account, not users in member accounts. Option C is incorrect because AWS Config can detect changes but cannot prevent them; it only reacts after the fact. Option D is incorrect because a cross-account role defines permissions to access resources, not restrictions; it does not prevent users from modifying IAM roles in their own account.

Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✓
Apply a service control policy (SCP) that denies IAM role modification actions to all accounts in the organization.
Why this is correct
An SCP applied to the organization can deny IAM role modifications across all accounts, and it cannot be overridden by account-level permissions, making it the most effective preventive control.
Related concept
Standard ACLs match source addresses.
✗
Attach an IAM policy to the Developers group in the management account that denies IAM actions.
Why it's wrong here
An IAM policy attached to the Developers group in the management account only applies to users in that account, not to users in member accounts.
✗
Use AWS Config to detect IAM role modifications and automatically revert them.
Why it's wrong here
AWS Config can detect and automatically revert changes, but it is a detective/reactive control, not a preventive one.
✗
Create a cross-account role in each member account that denies IAM actions.
Why it's wrong here
A cross-account role grants access from one account to another, but it does not prevent users in a member account from modifying IAM roles in their own account.

Common exam traps

Common exam trap: ACLs stop at the first match

ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.

Detailed technical explanation

How to think about this question

ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.

KKey Concepts to Remember

Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.

TExam Day Tips

Check inbound versus outbound direction.
Read the ACL from top to bottom.
Look for a broader permit or deny above the intended line.

Key takeaway

ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.

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.

Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.

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FAQ

Questions learners often ask

What does this SCS-C02 question test?

Management and Security Governance — This question tests Management and Security Governance — Standard ACLs match source addresses..

What is the correct answer to this question?

The correct answer is: Apply a service control policy (SCP) that denies IAM role modification actions to all accounts in the organization. — Option A is correct because a service control policy (SCP) applied to the organization root or to all accounts can deny IAM role modification actions (e.g., iam:CreateRole, iam:UpdateAssumeRolePolicy) for all principals in member accounts. SCPs are effective because they are applied at the organization level and cannot be overridden by account-level permissions, even for administrators. Option B is incorrect because an IAM policy attached to a group in the management account only affects users in that account, not users in member accounts. Option C is incorrect because AWS Config can detect changes but cannot prevent them; it only reacts after the fact. Option D is incorrect because a cross-account role defines permissions to access resources, not restrictions; it does not prevent users from modifying IAM roles in their own account.

What should I do if I get this SCS-C02 question wrong?

What is the key concept behind this question?

Standard ACLs match source addresses.

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