The answer is that the VM has not been rescanned after the remediation was applied. This is the most likely reason a vulnerability alert remains active in Defender for Cloud because the platform bases its alert state on the latest vulnerability assessment scan results, not on the remediation action itself. Even if you apply a patch or fix to the VM, the alert will persist until a new scan is triggered or the scheduled scan runs again and reports the vulnerability as resolved. On the Microsoft Azure Security Engineer Associate AZ-500 exam, this question tests your understanding of the Defender for Cloud assessment lifecycle and the common trap of assuming remediation automatically clears alerts. A helpful memory tip is "patch does not dismiss; a rescan is required to dismiss."
AZ-500 Practice Question: Secure Azure using Microsoft Defender for Cloud and Microsoft Sentinel
This AZ-500 practice question tests your understanding of secure azure using microsoft defender for cloud and microsoft sentinel. 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.
Your company uses Microsoft Defender for Cloud to assess the security posture of Azure subscriptions. The security team receives an alert about a critical vulnerability in an Azure VM that was remediated two weeks ago. What is the most likely reason the alert is still active?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The VM has not been rescanned after the remediation was applied.
Option C is correct because Defender for Cloud alerts are based on the latest vulnerability assessment scans; if the VM hasn't been rescanned since remediation, the alert remains. Option A is wrong because default policies don't suppress alerts. Option B is wrong because Silent Remediation suppresses alerts after remediation. Option D is wrong because alerts are not automatically dismissed after a time period.
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.
✓
The VM has not been rescanned after the remediation was applied.
Why this is correct
Defender for Cloud alerts are based on the last vulnerability scan; a new scan is needed to clear the alert.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The alert is a false positive due to a known issue in the vulnerability assessment engine.
Why it's wrong here
Defender for Cloud rarely has false positives for critical vulnerabilities.
✗
The alert has a 30-day retention period and cannot be dismissed before that.
Why it's wrong here
Alerts can be dismissed manually or automatically after remediation.
✗
Silent Remediation was enabled, preventing the alert from being dismissed.
Why it's wrong here
Silent Remediation dismisses alerts after remediation, not keeps them active.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-500 question in full detail.
Identify which AZ-500 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Secure Azure using Microsoft Defender for Cloud and Microsoft Sentinel — This question tests Secure Azure using Microsoft Defender for Cloud and Microsoft Sentinel — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The VM has not been rescanned after the remediation was applied. — Option C is correct because Defender for Cloud alerts are based on the latest vulnerability assessment scans; if the VM hasn't been rescanned since remediation, the alert remains. Option A is wrong because default policies don't suppress alerts. Option B is wrong because Silent Remediation suppresses alerts after remediation. Option D is wrong because alerts are not automatically dismissed after a time period.
What should I do if I get this AZ-500 question wrong?
Identify which AZ-500 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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