The correct answer is to rotate the compromised keys and implement multi-factor authentication on the account. Rotating the keys immediately invalidates the stolen credentials, directly cutting off the unauthorized access vector, while adding MFA—enforced through IAM conditions or workload identity federation for service accounts—creates a second authentication barrier that prevents recurrence even if keys are leaked again. On the CompTIA Cloud+ CV0-004 exam, this scenario tests your understanding that static access keys are a single point of failure; the exam often pairs key rotation with MFA as the most effective defense against credential theft, and a common trap is choosing only to delete the bucket or modify the policy without addressing the compromised keys themselves. Remember the memory tip: “Rotate the key, MFA the way”—meaning always invalidate stolen credentials first, then layer on MFA to block future unauthorized access.
CV0-004 Operations and Support Practice Question
This CV0-004 practice question tests your understanding of operations and support. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 cloud operations team is investigating a security breach where an unauthorized user accessed a storage bucket containing sensitive data. The logs show that the access occurred using valid access keys from an IP address outside the company's network. The administrator checks the IAM policies and finds that the keys belong to a service account that has read access to the bucket. Which of the following actions would be MOST effective in preventing a recurrence?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rotate the compromised keys and implement multi-factor authentication on the account.
Option D is correct because rotating the compromised keys immediately invalidates the stolen credentials, while implementing multi-factor authentication (MFA) on the service account adds an additional layer of security. Even though service accounts typically don't support interactive MFA, using IAM conditions to require MFA for API calls or using workload identity federation can enforce MFA-like controls. This directly addresses the root cause—compromised static keys—and prevents reuse of the stolen access keys.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Remove the bucket and restore from backup to a new bucket.
Why it's wrong here
This does not address the root cause of compromised credentials.
✗
Delete the service account and create a new one with the same permissions.
Why it's wrong here
The old keys could still be used until deletion, and new account could be compromised again.
✗
Change the bucket policy to deny access from outside the company's IP range.
Why it's wrong here
This does not revoke the stolen keys immediately; the attacker could still access.
✓
Rotate the compromised keys and implement multi-factor authentication on the account.
Why this is correct
Key rotation invalidates stolen keys, and MFA adds protection.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often choose Option C (IP-based policy) because they think it blocks external access, but they overlook that service accounts are not bound to a specific IP and can be used from any location, making IP restrictions ineffective for key-based access.
Detailed technical explanation
How to think about this question
In cloud environments like AWS, service account keys (e.g., IAM user access keys) are long-lived static credentials that can be exfiltrated and reused indefinitely unless rotated. Implementing MFA for API calls via IAM conditions (e.g., `aws:MultiFactorAuthPresent`) forces additional verification, but for service accounts, this requires using temporary credentials from AWS STS with MFA, which is not natively supported for non-human identities. A more robust approach is to use workload identity federation (e.g., OIDC) to eliminate static keys entirely, as recommended by the AWS Well-Architected Framework.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Operations and Support — This question tests Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Rotate the compromised keys and implement multi-factor authentication on the account. — Option D is correct because rotating the compromised keys immediately invalidates the stolen credentials, while implementing multi-factor authentication (MFA) on the service account adds an additional layer of security. Even though service accounts typically don't support interactive MFA, using IAM conditions to require MFA for API calls or using workload identity federation can enforce MFA-like controls. This directly addresses the root cause—compromised static keys—and prevents reuse of the stolen access keys.
What should I do if I get this CV0-004 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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