The answer is that the external CSV file is not accessible or the URL is malformed. This is the most likely issue because the externaldata operator in KQL reads the file at query time, and if the URL is broken, the file is unreachable, or the format doesn’t match the schema, no IPs are loaded into the query, causing it to return zero results despite known malicious activity. On the SC-200 exam, this tests your understanding of how externaldata differs from stored tables—it’s a common trap where candidates overlook connectivity or formatting errors and instead blame the query logic. A key memory tip: externaldata is like a live link—if the link is dead, the data is dead.
SC-200 Perform threat hunting Practice Question
This SC-200 practice question tests your understanding of perform threat hunting. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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
let HuntingTimeRange = 7d;
let MaliciousIPs = externaldata(IP:string)
["https://raw.githubusercontent.com/stixproject/.../malicious_ips.csv"]
with (format="csv");
DeviceNetworkEvents
| where Timestamp > ago(HuntingTimeRange)
| where RemoteIP in (MaliciousIPs)
| project Timestamp, DeviceName, RemoteIP, RemotePort, InitiatingProcessFileName
```
You are reviewing a threat hunting KQL query in Microsoft Sentinel. The query references an external CSV containing malicious IPs. The query returns no results despite known malicious activity. What is the most likely issue?
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
let HuntingTimeRange = 7d;
let MaliciousIPs = externaldata(IP:string)
["https://raw.githubusercontent.com/stixproject/.../malicious_ips.csv"]
with (format="csv");
DeviceNetworkEvents
| where Timestamp > ago(HuntingTimeRange)
| where RemoteIP in (MaliciousIPs)
| project Timestamp, DeviceName, RemoteIP, RemotePort, InitiatingProcessFileName
```
A
The externaldata function is not supported in Microsoft Sentinel.
Why wrong: externaldata is supported in Microsoft Sentinel.
B
The HuntingTimeRange variable is not being used correctly.
Why wrong: The variable is used correctly in the where clause.
C
The project clause removes the RemoteIP column.
Why wrong: The project clause includes RemoteIP, so it is not removed.
D
The external CSV file is not accessible or the URL is malformed.
If the external data source is unavailable, the join produces no results.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The external CSV file is not accessible or the URL is malformed.
Option B is correct because externaldata reads the file at query time, and if the URL is unreachable or the file format differs, no IPs are loaded, resulting in no matches. Option A is less likely because the syntax is valid. Option C is possible but the query does not filter on time; it uses the variable. Option D is incorrect because the query projects relevant fields.
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 externaldata function is not supported in Microsoft Sentinel.
Why it's wrong here
externaldata is supported in Microsoft Sentinel.
✗
The HuntingTimeRange variable is not being used correctly.
Why it's wrong here
The variable is used correctly in the where clause.
✗
The project clause removes the RemoteIP column.
Why it's wrong here
The project clause includes RemoteIP, so it is not removed.
✓
The external CSV file is not accessible or the URL is malformed.
Why this is correct
If the external data source is unavailable, the join produces no results.
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 SC-200 question in full detail.
Identify which SC-200 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.
Perform threat hunting — This question tests Perform threat hunting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The external CSV file is not accessible or the URL is malformed. — Option B is correct because externaldata reads the file at query time, and if the URL is unreachable or the file format differs, no IPs are loaded, resulting in no matches. Option A is less likely because the syntax is valid. Option C is possible but the query does not filter on time; it uses the variable. Option D is incorrect because the query projects relevant fields.
What should I do if I get this SC-200 question wrong?
Identify which SC-200 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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