The answer is an incorrect ActionType filter. This is the most likely reason your KQL query returns no results for PC001 and PC002 despite known antivirus detections, because the filter `ActionType == 'AntivirusDetection'` does not match the actual event action types recorded by Microsoft Defender XDR, which commonly use values like `AntivirusDetectedMalware` or `AntivirusDetectionCleaned`. When troubleshooting KQL no results, always verify that the ActionType string exactly corresponds to the schema for antivirus events, as even a slight mismatch silently excludes all matching rows. On the MD-102 exam, this scenario tests your ability to interpret Advanced Hunting schema and recognize that empty results often stem from filter logic rather than data absence or permissions. A common trap is assuming any “Antivirus” prefix will work, but Defender uses distinct action types for detection versus remediation. Memory tip: think “DetectedMalware” not just “Detection” — the full verb matters.
MD-102 Protect devices Practice Question
This MD-102 practice question tests your understanding of protect devices. 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.
Exhibit
Refer to the exhibit.
```kusto
DeviceEvents
| where Timestamp > ago(7d)
| where DeviceName in ('PC001', 'PC002')
| where ActionType == 'AntivirusDetection'
| summarize DetectionCount = count() by DeviceName
| where DetectionCount > 0
```
Refer to the exhibit. A KQL query in Microsoft Defender XDR returns no results for PC001 and PC002 even though you know there have been antivirus detections on those devices. What is the most likely reason?
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.
Refer to the exhibit.
```kusto
DeviceEvents
| where Timestamp > ago(7d)
| where DeviceName in ('PC001', 'PC002')
| where ActionType == 'AntivirusDetection'
| summarize DetectionCount = count() by DeviceName
| where DetectionCount > 0
```
A
The timestamp range is too narrow
Why wrong: 7 days should capture recent detections.
B
The device names are case-sensitive and are entered incorrectly
Why wrong: Defender XDR is case-insensitive for device names.
C
You do not have permissions to view events on those devices
Why wrong: Permissions would cause an error, not empty results.
D
The ActionType filter is incorrect for antivirus detections
Antivirus detection action types may be 'AntivirusDetectedMalware' or others.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The ActionType filter is incorrect for antivirus detections
Option C is correct: The query filters ActionType == 'AntivirusDetection', but the actual action type might be 'AntivirusDetectedMalware' or similar. Option A (Timestamp range) is 7 days, which should include recent events. Option B (DeviceName case mismatch) is possible but Defender XDR is case-insensitive by default. Option D (Permissions) would return an error, not empty results.
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 timestamp range is too narrow
Why it's wrong here
7 days should capture recent detections.
✗
The device names are case-sensitive and are entered incorrectly
Why it's wrong here
Defender XDR is case-insensitive for device names.
✗
You do not have permissions to view events on those devices
Why it's wrong here
Permissions would cause an error, not empty results.
✓
The ActionType filter is incorrect for antivirus detections
Why this is correct
Antivirus detection action types may be 'AntivirusDetectedMalware' or others.
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.
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
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MD-102 question in full detail.
Identify which MD-102 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.
Protect devices — This question tests Protect devices — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The ActionType filter is incorrect for antivirus detections — Option C is correct: The query filters ActionType == 'AntivirusDetection', but the actual action type might be 'AntivirusDetectedMalware' or similar. Option A (Timestamp range) is 7 days, which should include recent events. Option B (DeviceName case mismatch) is possible but Defender XDR is case-insensitive by default. Option D (Permissions) would return an error, not empty results.
What should I do if I get this MD-102 question wrong?
Identify which MD-102 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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