The answer is to enforce MFA for all users and require MFA when assuming the role, because multi-factor authentication adds a critical second layer of verification that renders stolen credentials useless for role assumption. Even if a user’s password is compromised, an attacker cannot assume the IAM role without the second factor, directly preventing data exfiltration from sensitive databases. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your understanding of defense-in-depth for identity and access management, specifically how MFA blocks lateral movement after credential theft. A common trap is choosing key rotation or resource policies, but those fail to stop an active compromised session. Remember the mnemonic “MFA stops the takeover” — if credentials are the key, MFA is the deadbolt that keeps the door locked even when the key is stolen.
CV0-004 Security Practice Question
This CV0-004 practice question tests your understanding of security. 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 security analyst is investigating a potential data exfiltration from a cloud environment. The analyst finds that an instance IAM role was assumed by a compromised user, and the role has permissions to read from a sensitive database. What is the BEST way to prevent this type of attack in the future?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enforce MFA for all users and require MFA when assuming the role.
Option C is correct because using multi-factor authentication (MFA) for all users and requiring MFA for role assumption can prevent unauthorized access even if credentials are compromised. Option A is wrong because rotating keys after the fact does not prevent future compromise. Option B is wrong because resource policies do not prevent compromised users from assuming roles. Option D is wrong because removing the role would break functionality.
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.
✓
Enforce MFA for all users and require MFA when assuming the role.
Why this is correct
MFA adds a second factor, making it much harder for attackers to use stolen credentials.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
Add a resource-based policy to the database to deny access from the role.
Why it's wrong here
This would block the role entirely, not just compromised users.
✗
Rotate the IAM role's access keys every 30 days.
Why it's wrong here
Key rotation reduces exposure window but does not prevent a compromised user from assuming the role.
✗
Remove the IAM role and use a service account instead.
Why it's wrong here
Service accounts are less secure than roles with MFA 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 security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
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 CV0-004 ACL questions on filtering logic and placement.
Security — This question tests Security — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Enforce MFA for all users and require MFA when assuming the role. — Option C is correct because using multi-factor authentication (MFA) for all users and requiring MFA for role assumption can prevent unauthorized access even if credentials are compromised. Option A is wrong because rotating keys after the fact does not prevent future compromise. Option B is wrong because resource policies do not prevent compromised users from assuming roles. Option D is wrong because removing the role would break functionality.
What should I do if I get this CV0-004 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 CV0-004 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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