Quick Answer
The answer is Microsoft Defender for Office 365, Microsoft Defender for Identity, and Microsoft Defender for Endpoint. These three components form the core of Microsoft Defender XDR because the suite is designed to unify threat signals across the most common attack surfaces: email, identity, and endpoints. Defender for Office 365 intercepts phishing and malware in email, Defender for Identity detects lateral movement and privilege escalation in Active Directory, and Defender for Endpoint provides endpoint detection and response across all major operating systems. On the Microsoft Cybersecurity Architect exam, this question tests your understanding of how Defender XDR integrates these three pillars into a single incident view, often appearing as a straightforward recall item. A common trap is confusing Microsoft Defender for Cloud Apps with the XDR suite—remember that Cloud Apps is part of Microsoft 365 Defender’s broader ecosystem but is not one of the three core XDR components. Memory tip: think of the acronym OIE—Office 365, Identity, and Endpoint—to recall the three included components.
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 THREE components are included in Microsoft Defender XDR?
Microsoft Defender for Office 365
Defender for Office 365 is part of Defender XDR.
Microsoft Defender for IoT
Why wrong: Defender for IoT is a separate product.
Microsoft Defender for Identity
Defender for Identity is part of Defender XDR.
Microsoft Defender for Endpoint
Defender for Endpoint is part of Defender XDR.
Microsoft Defender for Cloud
Why wrong: Defender for Cloud is a separate product.
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 Office 365
Microsoft Defender XDR (Extended Detection and Response) is a unified security suite that natively integrates Microsoft Defender for Office 365, Microsoft Defender for Identity, and Microsoft Defender for Endpoint. These three components work together to correlate signals across email, identity, and endpoint layers, providing a single-pane-of-glass view for threat detection and automated response. Microsoft Defender for Office 365 protects against email-based threats like phishing and malware, Defender for Identity monitors on-premises Active Directory and cloud identities for lateral movement and privilege escalation, and Defender for Endpoint provides endpoint detection and response (EDR) for Windows, macOS, Linux, Android, and iOS devices.
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 Office 365
Why this is correct
Defender for Office 365 is part of Defender XDR.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Defender for IoT
Why it's wrong here
Defender for IoT is a separate product.
Microsoft Defender for Identity
Why this is correct
Defender for Identity is part of Defender XDR.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Defender for Endpoint
Why this is correct
Defender for Endpoint is part of Defender XDR.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Defender for Cloud
Why it's wrong here
Defender for Cloud is a separate product.
Common exam traps
The trap here is that candidates often assume all 'Defender' branded products are automatically part of Microsoft Defender XDR, but Microsoft Defender for IoT and Microsoft Defender for Cloud are separate services that integrate via connectors rather than being core components of the unified XDR suite.
Detailed technical explanation
Under the hood, Microsoft Defender XDR uses a shared data lake (Microsoft 365 Defender portal) where signals from Defender for Endpoint, Defender for Identity, and Defender for Office 365 are correlated using machine learning models to automatically detect and remediate multi-stage attacks. For example, a phishing email (Office 365) that leads to credential theft (Identity) and then lateral movement to an endpoint (Endpoint) triggers an automated incident response that suspends the compromised user and isolates the affected device. The integration relies on the Microsoft Graph Security API and the Common Event Format (CEF) for cross-product alert enrichment.
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
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..
The correct answer is: Microsoft Defender for Office 365 — Microsoft Defender XDR (Extended Detection and Response) is a unified security suite that natively integrates Microsoft Defender for Office 365, Microsoft Defender for Identity, and Microsoft Defender for Endpoint. These three components work together to correlate signals across email, identity, and endpoint layers, providing a single-pane-of-glass view for threat detection and automated response. Microsoft Defender for Office 365 protects against email-based threats like phishing and malware, Defender for Identity monitors on-premises Active Directory and cloud identities for lateral movement and privilege escalation, and Defender for Endpoint provides endpoint detection and response (EDR) for Windows, macOS, Linux, Android, and iOS devices.
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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