This DOP-C02 practice question tests your understanding of security and compliance. 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 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?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an IAM policy that denies all actions unless MFA is present, and attach it to all IAM users or groups.
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.
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.
✗
Use Amazon Cognito to require MFA for console access.
Why it's wrong here
Cognito is for federated user access, not native IAM users.
✓
Create an IAM policy that denies all actions unless MFA is present, and attach it to all IAM users or groups.
MFA delete is for S3 versioning, not for console access.
✗
Enable MFA on the S3 bucket policy.
Why it's wrong here
MFA enforcement is done via IAM, not resource policies.
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 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
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: Create an IAM policy that denies all actions unless MFA is present, and attach it to all IAM users or groups. — 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.
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.
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Question Discussion
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