The answer is that the rule fails to fire because the KQL join logic requires at least one high-risk sign-in from the same IP address, and since all 12 sign-ins are low risk, no matching high-risk record exists to satisfy the inner join. This is the core of KQL join logic for risk-based alerts: the join operation filters out any IP address that does not have a corresponding high-risk sign-in, regardless of how many low-risk sign-ins exceed the threshold of 10. On the SC-200 exam, this scenario tests your understanding of how inner joins in KQL work with aggregation—specifically, that the threshold applies only to the first aggregation of sign-ins, but the join itself demands a matching high-risk event. A common trap is assuming the threshold alone triggers the alert, but without a high-risk sign-in on the same IP, the join returns zero results. Memory tip: think “inner join = both sides must match; low-risk alone never triggers a high-risk alert.”
SC-200 Respond to security incidents Practice Question
This SC-200 practice question tests your understanding of respond to security incidents. 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. The following KQL query is used in a Microsoft Sentinel analytics rule to detect anomalous Azure AD sign-ins:
```kql
let threshold = 10;
SigninLogs
| where TimeGenerated > ago(1h)
| summarize count() by UserPrincipalName, IPAddress
| where count_ > threshold
| join kind=inner (SigninLogs
| where TimeGenerated > ago(1h)
| where RiskLevelDuringSignIn == "high")
on UserPrincipalName, IPAddress
```
The analyst notices that the rule does not fire for a user who has 12 sign-ins from the same IP address, but all are low risk. The expected behavior is to alert when a single user has more than 10 sign-ins from the same IP with at least one high-risk sign-in. What is the issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "least"
Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
Refer to the exhibit. The following KQL query is used in a Microsoft Sentinel analytics rule to detect anomalous Azure AD sign-ins:
```kql
let threshold = 10;
SigninLogs
| where TimeGenerated > ago(1h)
| summarize count() by UserPrincipalName, IPAddress
| where count_ > threshold
| join kind=inner (SigninLogs
| where TimeGenerated > ago(1h)
| where RiskLevelDuringSignIn == "high")
on UserPrincipalName, IPAddress
```
A
The join should be on UserPrincipalName only, not IPAddress.
Why wrong: The requirement is same IP, so IPAddress must be included.
B
The join should be leftouter to include sign-ins without high risk.
Why wrong: Leftouter would include all, but the requirement is to require at least one high-risk.
C
The threshold is set to 10, but the user has 12 sign-ins, so it should fire.
Why wrong: The threshold is met, but the join condition fails because no high-risk sign-in exists.
D
The query requires a high-risk sign-in from the same IP, but none exist, so no match.
The inner join only returns rows where a high-risk sign-in exists for that user and IP.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The query requires a high-risk sign-in from the same IP, but none exist, so no match.
Option D is correct. The join requires high-risk sign-ins from the same IP, but the threshold only applies to the first aggregation. If all sign-ins are low risk, no high-risk join match occurs. Option A is wrong because the threshold is 10. Option B is wrong because the join is inner, which filters out non-matching. Option C is wrong because the join is on both 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 join should be on UserPrincipalName only, not IPAddress.
Why it's wrong here
The requirement is same IP, so IPAddress must be included.
✗
The join should be leftouter to include sign-ins without high risk.
Why it's wrong here
Leftouter would include all, but the requirement is to require at least one high-risk.
✗
The threshold is set to 10, but the user has 12 sign-ins, so it should fire.
Why it's wrong here
The threshold is met, but the join condition fails because no high-risk sign-in exists.
✓
The query requires a high-risk sign-in from the same IP, but none exist, so no match.
Why this is correct
The inner join only returns rows where a high-risk sign-in exists for that user and IP.
Clue confirmation
The clue word "least" 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 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 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.
Respond to security incidents — This question tests Respond to security incidents — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The query requires a high-risk sign-in from the same IP, but none exist, so no match. — Option D is correct. The join requires high-risk sign-ins from the same IP, but the threshold only applies to the first aggregation. If all sign-ins are low risk, no high-risk join match occurs. Option A is wrong because the threshold is 10. Option B is wrong because the join is inner, which filters out non-matching. Option C is wrong because the join is on both 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: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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