The correct security best practice is to prioritize alerts based on a risk assessment that considers asset criticality, threat severity, and business impact. This approach is technically sound because Microsoft Defender XDR’s risk-based alert prioritization engine dynamically scores each incident by combining the sensitivity of the affected asset—often derived from Microsoft Purview’s data classification or Defender for Cloud Apps—with the alert’s severity level (Informational through High) and the potential disruption to business operations. On the Microsoft Cybersecurity Architect exam, this concept tests your understanding of how to move beyond simple severity sorting toward a holistic triage model that aligns with the Zero Trust principle of assuming breach while minimizing operational friction. A common trap is to fixate solely on threat severity, ignoring that a Medium-severity alert on a CEO’s device may outweigh a High-severity alert on a test server. Remember the mnemonic ACT: Asset criticality, Context (business impact), and Threat severity—always assess all three before acting.
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.
You are designing a security operations strategy for Microsoft 365. You need to prioritize alerts from Microsoft Defender XDR based on their impact on business operations. Which security best practice should you follow?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Prioritize alerts based on a risk assessment that considers asset criticality, threat severity, and business impact
Option A is correct because Microsoft Defender XDR integrates with Microsoft 365 Defender's risk-based alert prioritization, which uses a combination of asset criticality (e.g., from Microsoft Purview or Defender for Cloud Apps), threat severity (e.g., from the Microsoft Defender portal's alert severity levels: Informational, Low, Medium, High), and business impact (e.g., via sensitivity labels or data classification). This aligns with the security best practice of risk-based alert triage, ensuring that high-impact alerts are addressed first to minimize business disruption.
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.
✓
Prioritize alerts based on a risk assessment that considers asset criticality, threat severity, and business impact
Why this is correct
Risk-based prioritization ensures resources are focused on the most impactful threats.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Prioritize alerts based on a qualitative risk assessment only
Why it's wrong here
Qualitative assessment is subjective; quantitative is more reliable.
✗
Treat all alerts with equal severity to ensure none are missed
Why it's wrong here
This leads to alert fatigue and delayed response to critical issues.
✗
Prioritize alerts based solely on the MITRE ATT&CK technique involved
Why it's wrong here
Technique alone does not account for business impact or asset criticality.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Option D because MITRE ATT&CK is a common framework in security operations, but they overlook that Microsoft Defender XDR's prioritization engine uses a multi-faceted risk assessment (including asset criticality and business impact) rather than a single technique-based filter.
Detailed technical explanation
How to think about this question
Microsoft Defender XDR uses a risk score calculated from the incident's impact (e.g., number of affected users, devices, and data sensitivity) and the alert's confidence level (e.g., from automated investigations). Under the hood, the Microsoft 365 Defender portal's 'Incidents & alerts' page applies a 'Threat & vulnerability management' integration that maps asset criticality from Microsoft Defender for Cloud's secure score or Microsoft Purview's data classification, enabling dynamic prioritization. In a real-world scenario, a phishing alert with MITRE ATT&CK technique T1566 on a CEO's device (critical asset) would be prioritized over a brute-force alert (T1110) on a guest user's device, even if the brute-force has a higher severity, because the business impact is greater.
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: Prioritize alerts based on a risk assessment that considers asset criticality, threat severity, and business impact — Option A is correct because Microsoft Defender XDR integrates with Microsoft 365 Defender's risk-based alert prioritization, which uses a combination of asset criticality (e.g., from Microsoft Purview or Defender for Cloud Apps), threat severity (e.g., from the Microsoft Defender portal's alert severity levels: Informational, Low, Medium, High), and business impact (e.g., via sensitivity labels or data classification). This aligns with the security best practice of risk-based alert triage, ensuring that high-impact alerts are addressed first to minimize business disruption.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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