This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. 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 THREE Microsoft 365 services are part of Microsoft Defender XDR (Extended Detection and Response)? (Select three.)
Microsoft Defender for Endpoint
Defender for Endpoint protects devices.
Microsoft Purview
Why wrong: Purview is for governance and compliance, not XDR.
Microsoft Defender for Identity
Defender for Identity protects on-premises Active Directory.
Microsoft Sentinel
Why wrong: Sentinel is a cloud-native SIEM, not part of Defender XDR.
Microsoft Defender for Office 365
Defender for Office 365 protects email and collaboration.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Microsoft Defender for Endpoint
Microsoft Defender XDR (Extended Detection and Response) is a unified security suite that correlates signals across endpoints, identities, and email/collaboration. Microsoft Defender for Endpoint is correct because it provides endpoint detection and response (EDR) capabilities, collecting telemetry from Windows, macOS, Linux, Android, and iOS devices to detect and remediate advanced threats.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Microsoft Defender for Endpoint
Why this is correct
Defender for Endpoint protects devices.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Purview
Why it's wrong here
Purview is for governance and compliance, not XDR.
Microsoft Defender for Identity
Why this is correct
Defender for Identity protects on-premises Active Directory.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Sentinel
Why it's wrong here
Sentinel is a cloud-native SIEM, not part of Defender XDR.
Microsoft Defender for Office 365
Why this is correct
Defender for Office 365 protects email and collaboration.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse Microsoft Sentinel (a SIEM) with a component of Defender XDR, but Sentinel is a separate Azure service that ingests logs from Defender XDR rather than being part of the XDR product itself.
Detailed technical explanation
Defender XDR uses a shared detection engine that automatically correlates alerts from Defender for Endpoint, Defender for Identity, and Defender for Office 365 into a single incident graph. For example, a phishing email detected by Defender for Office 365 can trigger an identity-based alert in Defender for Identity and an endpoint alert in Defender for Endpoint, all merged into one incident with automated remediation playbooks. The XDR stack relies on the Microsoft 365 Defender portal (security.microsoft.com) and the Microsoft Graph Security API for cross-product data fusion.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
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FAQ
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
The correct answer is: Microsoft Defender for Endpoint — Microsoft Defender XDR (Extended Detection and Response) is a unified security suite that correlates signals across endpoints, identities, and email/collaboration. Microsoft Defender for Endpoint is correct because it provides endpoint detection and response (EDR) capabilities, collecting telemetry from Windows, macOS, Linux, Android, and iOS devices to detect and remediate advanced threats.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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