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.
During a threat hunt, a security analyst uses Microsoft Sentinel and identifies a series of failed logon attempts from a single IP address targeting multiple user accounts. The analyst wants to create a scheduled analytics rule that generates an alert when the same IP address fails to logon to more than 10 different accounts within 5 minutes. Which KQL operator should be used to count distinct accounts per IP?
count()
Why wrong: count() counts all events, not distinct user accounts.
summarize count() by Account
Why wrong: This counts events per account, not distinct accounts across events.
distinct Account
Why wrong: distinct returns unique accounts but does not count them.
dcount(Account)
dcount provides an approximate distinct count of accounts, suitable for performance.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
dcount(Account)
Option B is correct because dcount is an approximate distinct count that is efficient for large datasets. Option A is wrong because count counts all events, not distinct accounts. Option C is wrong because distinct is used to return unique rows, not to count. Option D is wrong because summarize with count() counts all rows.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
count()
Why it's wrong here
count() counts all events, not distinct user accounts.
summarize count() by Account
Why it's wrong here
This counts events per account, not distinct accounts across events.
distinct Account
Why it's wrong here
distinct returns unique accounts but does not count them.
dcount(Account)
Why this is correct
dcount provides an approximate distinct count of accounts, suitable for performance.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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.
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FAQ
Perform threat hunting — This question tests Perform threat hunting — Read the scenario before looking for a memorised answer..
The correct answer is: dcount(Account) — Option B is correct because dcount is an approximate distinct count that is efficient for large datasets. Option A is wrong because count counts all events, not distinct accounts. Option C is wrong because distinct is used to return unique rows, not to count. Option D is wrong because summarize with count() counts all rows.
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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 21, 2026
This SC-200 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SC-200 exam.
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