The answer is that the SCP must deny actions when the user has not authenticated with MFA, and it must be attached to the root organizational unit to apply to all accounts. These two conditions work together because the SCP uses the `aws:MultiFactorAuthPresent` condition key in a Deny effect to block any API call or console access if MFA is not present, while attaching the policy to the root OU ensures it cascades down to every account in the organization. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding that SCPs cannot enforce MFA registration—they only restrict access—and that the condition key must be set to false to deny unauthenticated sessions. A common trap is confusing the `aws:MultiFactorAuthPresent` key with `aws:MultiFactorAuthAge` or assuming SCPs can require users to register devices. Remember the mnemonic: “Deny if false, attach to root—no MFA, no route.”
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 has a security policy that requires all IAM users to use multi-factor authentication (MFA) when accessing the AWS Management Console. The company also wants to enforce this policy using an SCP. Which TWO conditions must be met for the SCP to be effective?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The SCP must use a condition that checks if MFA is present.
Options A and E are correct. The SCP must deny actions if the user has not authenticated with MFA (A), and the SCP must be attached to the root organizational unit (E) to apply to all accounts. Option B is wrong because the condition key aws:MultiFactorAuthPresent is the correct one. Option C is wrong because SCPs cannot enforce MFA registration; they can only deny access. Option D is wrong because MFA authentication is required for console access, not just API calls.
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.
✓
The SCP must use a condition that checks if MFA is present.
Why this is correct
The SCP uses aws:MultiFactorAuthPresent to check MFA status.
Related concept
Standard ACLs match source addresses.
✗
The SCP must use the condition key 'aws:SourceIp' to allow only MFA-enabled IPs.
Why it's wrong here
Source IP is not related to MFA; aws:MultiFactorAuthPresent is the correct key.
✗
The SCP must require users to register MFA devices before accessing the console.
Why it's wrong here
SCPs cannot enforce registration; they only deny access based on conditions.
✓
The SCP must be attached to the root organizational unit to apply to all accounts.
Why this is correct
Attaching to the root OU ensures the SCP applies to all accounts in the organization.
Related concept
Standard ACLs match source addresses.
✗
The SCP must be attached to individual IAM users.
Why it's wrong here
SCPs are attached to OUs or accounts, not IAM users.
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.
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: The SCP must use a condition that checks if MFA is present. — Options A and E are correct. The SCP must deny actions if the user has not authenticated with MFA (A), and the SCP must be attached to the root organizational unit (E) to apply to all accounts. Option B is wrong because the condition key aws:MultiFactorAuthPresent is the correct one. Option C is wrong because SCPs cannot enforce MFA registration; they can only deny access. Option D is wrong because MFA authentication is required for console access, not just API calls.
What should I do if I get this SCS-C02 question wrong?
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.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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