The answer is to create an IAM policy that uses the aws:MultiFactorAuthPresent condition key to deny access if false, and then attach that policy to all users or a group. This works because the condition key evaluates whether the user authenticated with a valid MFA device during the session; if the key returns false, the policy explicitly denies all console actions, effectively locking out any user without MFA. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this scenario tests your understanding of identity-based policy conditions versus service control policies—a common trap is to assume you need an SCP for a single account, but SCPs are for multi-account organizations. Remember, CloudTrail logs actions but never enforces them, and account aliases are purely cosmetic. For a quick memory tip: think “Deny if false” for MFA enforcement—the condition key is your gatekeeper, not your auditor.
DOP-C02 Security and Compliance Practice Question
This DOP-C02 practice question tests your understanding of security and compliance. 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.
A company needs to enforce that all IAM users must use multi-factor authentication (MFA) to perform any AWS Console actions. Which TWO steps should be taken to enforce this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attach the policy to all IAM users or a group containing all users
To enforce MFA, you need an IAM policy that denies actions if MFA is not present, and you must attach that policy to all users or a group. Creating an SCP can enforce across accounts but is not needed for single account. CloudTrail does not enforce. Account alias is unrelated.
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.
✓
Attach the policy to all IAM users or a group containing all users
Why this is correct
The policy must be applied to users to take effect.
Related concept
Standard ACLs match source addresses.
✗
Create an SCP in AWS Organizations
Why it's wrong here
SCPs apply to accounts, not users directly, and are not needed for a single account.
✓
Create an IAM policy that uses the aws:MultiFactorAuthPresent condition key to deny access if false
Why this is correct
This policy denies all actions unless MFA is present.
Related concept
Standard ACLs match source addresses.
✗
Set an account alias for the root user
Why it's wrong here
Account alias is for sign-in URL, not MFA enforcement.
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 DOP-C02 ACL questions on filtering logic and placement.
Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Attach the policy to all IAM users or a group containing all users — To enforce MFA, you need an IAM policy that denies actions if MFA is not present, and you must attach that policy to all users or a group. Creating an SCP can enforce across accounts but is not needed for single account. CloudTrail does not enforce. Account alias is unrelated.
What should I do if I get this DOP-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 DOP-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company has a security policy requiring that all IAM users use multi-factor authentication (MFA) to access the AWS Management Console. The DevOps engineer needs to enforce this policy. What is the simplest way to achieve this?
easy
A.Use Amazon Cognito to require MFA for console access.
✓ B.Create an IAM policy that denies all actions unless MFA is present, and attach it to all IAM users or groups.
C.Enable MFA delete on the root account.
D.Enable MFA on the S3 bucket policy.
Why B: Option A is correct because an IAM policy with a condition for aws:MultiFactorAuthPresent: true can be attached to a group or user to deny access if MFA is not used. Option B is wrong because MFA cannot be enforced at the resource level for S3. Option C is wrong because it only applies to root user, not IAM users. Option D is wrong because Cognito is for application users, not AWS console access.
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This DOP-C02 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 DOP-C02 exam.
Question Discussion
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