MS-102 Practice Question: Manage security and threats by using Microsoft Defender XDR
This MS-102 practice question tests your understanding of manage security and threats by using microsoft defender xdr. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 ActionType == "AntivirusDetection"
| where FileName has_any ("ransomware", "encrypt")
| summarize ThreatCount = count() by DeviceName
| top 10 by ThreatCount
```
A security analyst runs the above KQL query in Microsoft 365 Defender. The query returns an empty result set. Which 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 ActionType == "AntivirusDetection"
| where FileName has_any ("ransomware", "encrypt")
| summarize ThreatCount = count() by DeviceName
| top 10 by ThreatCount
```
A
The time range is too wide and the query times out.
Why wrong: 7 days is not too wide.
B
No antivirus detection events for files with 'ransomware' or 'encrypt' in the filename occurred in the last 7 days.
The filter is too restrictive.
C
The 'has_any' operator is used incorrectly; it should be 'contains' for each condition.
Why wrong: has_any is correct.
D
The DeviceEvents table does not contain antivirus detection events.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No antivirus detection events for files with 'ransomware' or 'encrypt' in the filename occurred in the last 7 days.
The query uses 'has_any' to match filenames containing 'ransomware' or 'encrypt'. If no detections match those strings, the result is empty. Option B is correct. Option A is wrong because the query uses the correct table. Option C is wrong because the syntax is valid. Option D is wrong because the time range is 7 days, which is typical.
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 time range is too wide and the query times out.
Why it's wrong here
7 days is not too wide.
✓
No antivirus detection events for files with 'ransomware' or 'encrypt' in the filename occurred in the last 7 days.
Why this is correct
The filter is too restrictive.
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 'has_any' operator is used incorrectly; it should be 'contains' for each condition.
Why it's wrong here
has_any is correct.
✗
The DeviceEvents table does not contain antivirus detection events.
Why it's wrong here
DeviceEvents contains antivirus detections.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Identify which MS-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.
Manage security and threats by using Microsoft Defender XDR — This question tests Manage security and threats by using Microsoft Defender XDR — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: No antivirus detection events for files with 'ransomware' or 'encrypt' in the filename occurred in the last 7 days. — The query uses 'has_any' to match filenames containing 'ransomware' or 'encrypt'. If no detections match those strings, the result is empty. Option B is correct. Option A is wrong because the query uses the correct table. Option C is wrong because the syntax is valid. Option D is wrong because the time range is 7 days, which is typical.
What should I do if I get this MS-102 question wrong?
Identify which MS-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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