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CLF-C02 Practice Question: Implement multi-factor authentication for all IAM…
This CLF-C02 practice question tests your understanding of implement multi-factor authentication for all iam…. 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 wants to implement multi-factor authentication for all IAM users across their AWS Organization without requiring individual account administrators to configure MFA for each user. Which approach enables organization-wide MFA enforcement?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Enable AWS Config rule to check MFA status
Config can detect users without MFA and report non-compliance but doesn't enforce MFA — it's a detective control, not a preventive one.
B
Distractor review
Enable MFA on the root account only
Root account MFA only protects root — IAM users without MFA would still have full access to their permitted resources.
C
Best answer
Apply an SCP that denies all actions unless MFA is authenticated
An MFA enforcement SCP at the org root denies all AWS actions when `aws:MultiFactorAuthPresent` is false — IAM users must authenticate with MFA or they can't perform any actions.
D
Distractor review
Configure IAM password policies to require MFA
IAM password policies control password complexity — they can't enforce MFA authentication (different from password policies).
Common exam trap
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.
Technical deep dive
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.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A developer needs to launch a test server for a new application prototype. The developer logs into the AWS Management Console, selects an Amazon EC2 instance type, configures the security group, and starts the instance. The instance is running within two minutes, and the developer did not need to submit a formal request to the company's IT procurement team or wait for approval from a cloud administrator. Which essential characteristic of cloud computing does this scenario best demonstrate?
Question 2
A solutions architect is planning a new web application on AWS. The workload will include 3 Amazon EC2 instances (t3.medium) running 24/7, an Application Load Balancer, and an Amazon RDS for MySQL db.t3.small database. The architect needs to estimate the monthly cost for the first year, considering different purchasing options (On-Demand, 1-year All Upfront Reserved Instance, and Compute Savings Plan). Which AWS tool should the architect use to create this estimate?
Question 3
A company's development team frequently needs temporary test environments. A developer can log into the AWS Management Console, select an Amazon EC2 instance type, configure storage, and launch the instance within minutes without any interaction with the IT infrastructure team. This capability is an example of which essential characteristic of cloud computing?
Question 4
A company's finance team needs to analyze AWS spending in detail. They require a report that includes hourly cost data for each AWS service, each individual resource (e.g., a specific EC2 instance), and any cost allocation tags applied. The team plans to export this data to an Amazon S3 bucket and then import it into a custom business intelligence (BI) analytics dashboard. Which AWS tool should the finance team use to generate this level of detailed cost data?
Question 5
A company uses AWS for its development environment. The finance team wants to set a monthly budget of $10,000. They want to receive an email notification when the actual costs reach 80% of the budget ($8,000) and again when costs exceed the budget. The team needs a managed AWS service that can automatically send these alerts without requiring custom code or third-party tools. Which AWS service should the team use?
Question 6
A company uses AWS Organizations to manage multiple accounts. The security team needs to enforce a policy that restricts SSH access (port 22) from the internet (0.0.0.0/0) in all VPCs across all accounts. The team wants to centrally define the allowed rules and automatically apply them to newly created VPCs and security groups, while also automatically remediating any existing non-compliant security groups. Which AWS service should the team use?
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FAQ
Questions learners often ask
What does this CLF-C02 question test?
Standard ACLs match source addresses.
What is the correct answer to this question?
The correct answer is: Apply an SCP that denies all actions unless MFA is authenticated — An AWS Organizations SCP can deny all API actions (Deny *) except the actions needed to configure MFA for any IAM user or role that doesn't have MFA authenticated. This 'MFA enforcement SCP' ensures that even if account admins don't configure MFA manually, users without MFA can't perform any meaningful AWS actions — effectively forcing MFA adoption.
What should I do if I get this CLF-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 CLF-C02 ACL questions on filtering logic and placement.
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