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. 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
SecurityAlert | where AlertName == "Malware detected" | summarize Count = count() by Computer, bin(TimeGenerated, 1d) | where Count > 2
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The alert name in the environment is not exactly 'Malware detected'; it might include a suffix like 'on endpoint'.
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.
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 'summarize' function is incorrectly used and creates duplicate counts.
Why it's wrong here
The summarize function is used correctly.
✗
The query filters out alerts with severity less than 'High'.
Why it's wrong here
The query does not filter by severity.
✗
The query does not include a time range filter, so it returns data from all time.
Why it's wrong here
The query uses 'bin' on TimeGenerated, which limits to the last 24 hours by default.
✓
The alert name in the environment is not exactly 'Malware detected'; it might include a suffix like 'on endpoint'.
Why this is correct
The exact string match is too restrictive.
Clue confirmation
The clue word "most likely" 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
The trap here is that candidates assume the query logic is correct and focus on aggregation or time range issues, overlooking the exact string match requirement in KQL, which is a frequent cause of false negatives in detection queries.
Detailed technical explanation
How to think about this question
In KQL, string comparisons are case-sensitive by default unless using the 'has' or 'contains' operators. When querying the 'AlertName' field from the SecurityAlert table (or similar), an exact match with 'Malware detected' will fail if the actual value is 'Malware detected on endpoint' or 'Malware detected - Windows'. This is a common pitfall when integrating Microsoft Defender for Endpoint alerts, where the alert name often includes a suffix indicating the source or platform. Using 'AlertName has 'Malware detected'' or a wildcard pattern would resolve this.
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: The alert name in the environment is not exactly 'Malware detected'; it might include a suffix like 'on endpoint'. — 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.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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