The answer is automated investigation and response, which is one of the two key benefits of Microsoft Defender XDR. This capability directly stems from the platform’s ability to correlate alerts across endpoints, email, identities, and cloud apps into a unified incident view, allowing security teams to detect and contain multi-stage attacks that span different attack surfaces without manual intervention. On the Microsoft Cybersecurity Architect exam, this concept tests your understanding of how XDR differs from traditional SIEM or EDR tools—specifically, that Defender XDR provides built-in automation rather than just alert aggregation. A common trap is confusing automated response with simple alerting; remember that the “R” in XDR stands for response, not just detection. To recall this, think of the mnemonic “A.I.R.”—Automated Investigation and Response—which highlights that the platform both investigates the incident and takes corrective action, a core benefit that reduces mean time to respond.
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.
Which TWO of the following are benefits of using Microsoft Defender XDR (Extended Detection and Response)? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Cross-domain correlation of alerts
Option C is correct because Microsoft Defender XDR correlates alerts across endpoints, email, identities, and cloud apps to provide a unified incident view. This cross-domain correlation enables security teams to detect multi-stage attacks that span different attack surfaces, which is a core benefit of an XDR solution.
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.
✗
Scans for vulnerabilities in VMs
Why it's wrong here
Vulnerability scanning is in Microsoft Defender for Cloud.
✗
Provides compliance assessments
Why it's wrong here
Compliance assessments are in Microsoft Purview.
✓
Cross-domain correlation of alerts
Why this is correct
Defender XDR correlates alerts from multiple sources into incidents.
Related concept
Read the scenario before looking for a memorised answer.
✗
Replaces the need for a firewall
Why it's wrong here
Defender XDR does not replace network firewalls.
✓
Automated investigation and response
Why this is correct
Defender XDR can automatically respond to threats.
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 confuse the broad capabilities of the Microsoft security portfolio (e.g., Defender for Cloud, Purview) with the specific scope of Defender XDR, leading them to select features that belong to other services.
Detailed technical explanation
How to think about this question
Defender XDR uses the Microsoft 365 Defender portal to ingest signals from Defender for Endpoint, Defender for Office 365, Defender for Identity, and Defender for Cloud Apps. The cross-domain correlation engine uses machine learning to link alerts into a single incident based on entities like user accounts, devices, and IP addresses, enabling automated investigation that traverses email, endpoint, and identity telemetry without manual pivoting.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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: Cross-domain correlation of alerts — Option C is correct because Microsoft Defender XDR correlates alerts across endpoints, email, identities, and cloud apps to provide a unified incident view. This cross-domain correlation enables security teams to detect multi-stage attacks that span different attack surfaces, which is a core benefit of an XDR solution.
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.
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Question Discussion
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