SC-100 Practice Question: Design security operations, identity, and compliance capabilities
This SC-100 practice question tests your understanding of design security operations, identity, and compliance capabilities. 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
SecurityAlert
| where TimeGenerated > ago(7d)
| where Severity == "High"
| summarize AlertCount = count() by AlertName, CompromisedEntity
| where AlertCount > 5
| project AlertName, CompromisedEntity, AlertCount
```
Refer to the exhibit. You run this KQL query in Microsoft Sentinel. What is the primary purpose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Detect entities that have been repeatedly targeted by high-severity alerts
The KQL query uses the `make_set` function to aggregate distinct alert names per entity (e.g., host or user) and then filters for entities that have been hit by more than 5 distinct high-severity alerts. This directly identifies entities repeatedly targeted by high-severity alerts, which is the primary purpose.
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.
✗
Correlate alerts across different data sources
Why it's wrong here
The query uses a single table (SecurityAlert) and does not join other data sources.
✗
Identify new high-severity alerts in the last 7 days
Why it's wrong here
The query counts alerts, not specifically new ones; it also filters for count > 5, which indicates frequent alerts.
✓
Detect entities that have been repeatedly targeted by high-severity alerts
Why this is correct
The query groups by CompromisedEntity and counts alerts, then filters for more than 5, indicating repeated targeting.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Find entities with fewer than 5 high-severity alerts
Why it's wrong here
The query filters for AlertCount > 5, not fewer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Microsoft often tests the distinction between counting total alerts versus counting distinct alert types, so candidates may mistakenly think the query counts all alerts (including duplicates) and pick option D, when in fact `make_set` deduplicates by alert name.
Detailed technical explanation
How to think about this question
The `make_set` function creates a dynamic array of unique values (here, `AlertName`) for each entity, and `array_length` returns the count of distinct alert names. This is more precise than a simple count because it deduplicates repeated occurrences of the same alert type, ensuring that only distinct alert patterns are considered. In a real-world scenario, this helps identify a host that has been hit by multiple different attack techniques (e.g., brute force, malware, lateral movement) rather than just many instances of the same alert.
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.
TExam Day Tips
→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-100 question in full detail.
Design security operations, identity, and compliance capabilities — This question tests Design security operations, identity, and compliance capabilities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Detect entities that have been repeatedly targeted by high-severity alerts — The KQL query uses the `make_set` function to aggregate distinct alert names per entity (e.g., host or user) and then filters for entities that have been hit by more than 5 distinct high-severity alerts. This directly identifies entities repeatedly targeted by high-severity alerts, which is the primary purpose.
What should I do if I get this SC-100 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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