The correct answer is that this KQL query counts MFA security alerts per day for the last 7 days. It works by using a `where` clause to filter for alerts whose name contains 'MFA', then applying `summarize` with `bin(TimeGenerated, 1d)` to group those alerts into daily buckets, and finally rendering a timechart to visualize the count over time. On the SC-900 exam, this tests your ability to interpret Kusto queries in Microsoft Sentinel, a common task for security analysts. A frequent trap is confusing alert counts with user or identity counts—the query counts alert occurrences, not distinct users or identities, and it does not filter by severity. Remember the mnemonic "MFA Day Count" to recall that the query focuses on MFA, daily bins, and alert counts, not user-level details.
SC-900 Practice Question: Describe the concepts of security, compliance, and identity
This SC-900 practice question tests your understanding of describe the concepts of security, compliance, and identity. 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
// KQL query in Microsoft Sentinel
SecurityAlert
| where TimeGenerated > ago(7d)
| where AlertName has "MFA"
| summarize Count = count() by AlertName, bin(TimeGenerated, 1d)
| render timechart
```
You are a security analyst using Microsoft Sentinel. You run the Kusto query shown in the exhibit. What does this query do?
Refer to the exhibit.
```kusto
// KQL query in Microsoft Sentinel
SecurityAlert
| where TimeGenerated > ago(7d)
| where AlertName has "MFA"
| summarize Count = count() by AlertName, bin(TimeGenerated, 1d)
| render timechart
```
A
Counts security alerts containing 'MFA' per day for the last 7 days
Summarize count() by AlertName and time creates a daily count.
B
Lists all identities that triggered MFA alerts
Why wrong: It does not list identities; it aggregates counts.
C
Counts distinct users with MFA alerts per day
Why wrong: It counts alerts, not distinct users.
D
Counts alerts by severity over the last week
Why wrong: There is no severity filter or grouping.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Counts security alerts containing 'MFA' per day for the last 7 days
Option B is correct. The query filters alerts with 'MFA' in the name over the last 7 days, counts them per day, and renders a timechart. Option A is wrong because it counts alerts, not distinct users. Option C is wrong because it counts alerts, not identities. Option D is wrong because it doesn't filter by severity.
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.
✓
Counts security alerts containing 'MFA' per day for the last 7 days
Why this is correct
Summarize count() by AlertName and time creates a daily count.
Related concept
Read the scenario before looking for a memorised answer.
✗
Lists all identities that triggered MFA alerts
Why it's wrong here
It does not list identities; it aggregates counts.
✗
Counts distinct users with MFA alerts per day
Why it's wrong here
It counts alerts, not distinct users.
✗
Counts alerts by severity over the last week
Why it's wrong here
There is no severity filter or grouping.
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-900 question in full detail.
Identify which SC-900 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.
Describe the concepts of security, compliance, and identity — This question tests Describe the concepts of security, compliance, and identity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Counts security alerts containing 'MFA' per day for the last 7 days — Option B is correct. The query filters alerts with 'MFA' in the name over the last 7 days, counts them per day, and renders a timechart. Option A is wrong because it counts alerts, not distinct users. Option C is wrong because it counts alerts, not identities. Option D is wrong because it doesn't filter by severity.
What should I do if I get this SC-900 question wrong?
Identify which SC-900 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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