The answer is to identify malware alerts on unmanaged devices in Microsoft Sentinel. This is correct because the KQL query first filters the `DeviceInfo` table for entries where `IsManaged` is `false`, isolating devices not under endpoint management, then joins that result with the `SecurityAlert` table to find alerts whose `AlertName` contains the string 'Malware'. The join ensures only alerts tied to those specific unmanaged devices are returned, rather than all malware alerts or a general device inventory. On the Microsoft Cybersecurity Architect exam, this tests your ability to interpret KQL logic for security operations scenarios, often appearing in questions that require distinguishing between managed and unmanaged device telemetry. A common trap is assuming the query counts all malware alerts, but the `IsManaged` filter is the critical differentiator. Memory tip: think "Unmanaged + Malware = Unmalware" or simply remember that `IsManaged == false` is the gatekeeper for unmanaged device alerts.
SC-100 Practice Question: Design solutions that align with security best practices and priorities
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. 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
SecurityAlert
| where AlertName == "Malware detected"
| extend DeviceName = tostring(CompromisedEntity)
| join kind=inner (
DeviceInfo
| where Timestamp > ago(7d)
| project DeviceName, OSVersion, IsManaged
) on DeviceName
| where IsManaged == false
Refer to the exhibit. You are analyzing a KQL query in Microsoft Sentinel. What is the purpose of this query?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Identify malware alerts on unmanaged devices
The query uses the `DeviceInfo` table to filter for devices where `IsManaged` is `false`, then joins with `SecurityAlert` to find alerts where `AlertName` contains 'Malware'. This specifically identifies malware alerts generated on unmanaged devices, not all malware alerts or a general device inventory.
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 malware alerts with device OS version
Why it's wrong here
While it includes OSVersion, the main filter is unmanaged status.
✗
List all malware alerts in the last 7 days
Why it's wrong here
It only shows alerts from unmanaged devices, not all.
✓
Identify malware alerts on unmanaged devices
Why this is correct
Exactly: filters on IsManaged == false.
Related concept
Read the scenario before looking for a memorised answer.
✗
Show device inventory for unmanaged devices
Why it's wrong here
It shows alerts, not inventory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the purpose of the query as simply listing all malware alerts (Option B) or showing device inventory (Option D), overlooking the critical `IsManaged == false` filter that narrows the scope to unmanaged devices.
Trap categories for this question
Command / output trap
It only shows alerts from unmanaged devices, not all.
Detailed technical explanation
How to think about this question
The `DeviceInfo` table in Microsoft Sentinel contains device properties including `IsManaged`, which indicates whether the device is managed by Microsoft Defender for Endpoint or another MDM solution. The join with `SecurityAlert` on `DeviceId` ensures only alerts from unmanaged devices are returned, which is critical for identifying gaps in endpoint coverage. In real-world scenarios, this query helps security teams prioritize remediation for devices lacking management, as they may have weaker security controls.
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 solutions that align with security best practices and priorities — This question tests Design solutions that align with security best practices and priorities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Identify malware alerts on unmanaged devices — The query uses the `DeviceInfo` table to filter for devices where `IsManaged` is `false`, then joins with `SecurityAlert` to find alerts where `AlertName` contains 'Malware'. This specifically identifies malware alerts generated on unmanaged devices, not all malware alerts or a general device inventory.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Refer to the exhibit. You are analyzing a KQL query in Microsoft Sentinel that detects machines with more than two malware alerts in a day. The query returns no results even though you know there are machines with multiple malware alerts. What is the most likely reason?
medium
A.The 'summarize' function is incorrectly used and creates duplicate counts.
B.The query filters out alerts with severity less than 'High'.
C.The query does not include a time range filter, so it returns data from all time.
✓ D.The alert name in the environment is not exactly 'Malware detected'; it might include a suffix like 'on endpoint'.
Why D: Option D is correct because the KQL query likely uses a hardcoded string 'Malware detected' in a where clause to filter alerts. If the actual alert names in the environment include a suffix like 'on endpoint' (e.g., 'Malware detected on endpoint'), the exact string match fails, causing the query to return no results. This is a common issue when alert naming conventions vary across Microsoft Defender for Endpoint or other data sources ingested into Sentinel.
Last reviewed: Jun 24, 2026
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