Quick Answer
The answer is Microsoft Defender for Office 365 and Microsoft Defender for Endpoint. These two are correct because Microsoft Defender XDR is built as a unified security operations platform that natively ingests and correlates signals from these core components—Defender for Endpoint provides endpoint detection and response (EDR) telemetry, while Defender for Office 365 secures email and collaboration data—enabling cross-domain threat correlation and automated response within the Defender portal. On the Microsoft Cybersecurity Architect exam, this question tests your understanding of the foundational pillars of the XDR architecture; a common trap is confusing standalone products like Microsoft Defender for Cloud Apps or Azure AD Identity Protection as direct XDR components, when they are actually integrated via Microsoft 365 Defender but not the two core telemetry sources. To remember, think of the acronym “E-O”: Endpoint and Office are the two essential signal feeds that make XDR’s extended detection possible.
This SC-100 practice question tests your understanding of design security operations, identity, and compliance capabilities. 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 components of Microsoft Defender XDR (Extended Detection and Response)?
Microsoft Sentinel
Why wrong: Sentinel is a separate SIEM solution.
Microsoft Defender for Endpoint
Defender for Endpoint is a core component of Defender XDR.
Microsoft Defender for Office 365
Defender for Office 365 is a component of Defender XDR.
Microsoft Intune
Why wrong: Intune is MDM, not part of Defender XDR.
Microsoft Purview
Why wrong: Purview is for data governance and compliance.
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 operations platform that natively integrates signals from Microsoft Defender for Endpoint (endpoint detection and response) and Microsoft Defender for Office 365 (email and collaboration security). These two components provide the core telemetry for cross-domain threat correlation and automated response within the Defender XDR portal.
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 Sentinel
Why it's wrong here
Sentinel is a separate SIEM solution.
Microsoft Defender for Endpoint
Why this is correct
Defender for Endpoint is a core component of Defender XDR.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Defender for Office 365
Why this is correct
Defender for Office 365 is a component of Defender XDR.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Intune
Why it's wrong here
Intune is MDM, not part of Defender XDR.
Microsoft Purview
Why it's wrong here
Purview is for data governance and compliance.
Common exam traps
The trap here is that candidates often confuse Microsoft Sentinel (a SIEM) as part of Defender XDR, but Sentinel is a separate Azure service that can ingest Defender XDR alerts, not a component of the XDR platform itself.
Detailed technical explanation
Under the hood, Defender XDR uses a common data schema and correlation engine that merges alerts from Defender for Endpoint (e.g., process creation events, network connections) and Defender for Office 365 (e.g., phishing detections, email attachment analysis) into a single incident. This enables automated investigation and response across endpoints and email, such as automatically isolating a compromised device when a malicious link is clicked in an email, without requiring manual SIEM correlation.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
What to study next
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FAQ
Design security operations, identity, and compliance capabilities — This question tests Design security operations, identity, and compliance capabilities — 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 operations platform that natively integrates signals from Microsoft Defender for Endpoint (endpoint detection and response) and Microsoft Defender for Office 365 (email and collaboration security). These two components provide the core telemetry for cross-domain threat correlation and automated response within the Defender XDR portal.
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
This SC-100 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SC-100 exam.
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