- A
Microsoft Defender for Endpoint
Correct. Microsoft Defender for Endpoint is a core component of Defender XDR, providing endpoint detection and response.
- B
Microsoft Defender for Cloud Apps
Correct. Microsoft Defender for Cloud Apps is part of Defender XDR, offering cloud app security.
- C
Microsoft Sentinel
Why wrong: Incorrect. Microsoft Sentinel is a cloud-native SIEM and SOAR solution, separate from Defender XDR.
- D
Microsoft Defender for Office 365
Correct. Microsoft Defender for Office 365 is a component of Defender XDR, protecting email and collaboration.
- E
Microsoft Defender for Identity
Correct. Microsoft Defender for Identity is a core component of Defender XDR, detecting identity-based threats.
Question 494 of 985
Microsoft Defender XDR: Core Services in the Extended Detection and Response Suite
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. A key principle to apply: microsoft Defender XDR. 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 the Microsoft Defender XDR suite?
Answer choices
Why each option matters
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, email, and cloud apps. It consists of four core services: Microsoft Defender for Endpoint, Microsoft Defender for Office 365, Microsoft Defender for Identity, and Microsoft Defender for Cloud Apps. Microsoft Sentinel is a separate SIEM service that can ingest data from Defender XDR but is not part of the suite itself.
Key principle: Microsoft Defender XDR
Answer analysis
Option-by-option breakdown
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
Correct. Microsoft Defender for Endpoint is a core component of Defender XDR, providing endpoint detection and response.
Related concept
Microsoft Defender XDR
- ✓
Microsoft Defender for Cloud Apps
Why this is correct
Correct. Microsoft Defender for Cloud Apps is part of Defender XDR, offering cloud app security.
Related concept
Microsoft Defender XDR
- ✗
Microsoft Sentinel
Why it's wrong here
Incorrect. Microsoft Sentinel is a cloud-native SIEM and SOAR solution, separate from Defender XDR.
- ✓
Microsoft Defender for Office 365
Why this is correct
Correct. Microsoft Defender for Office 365 is a component of Defender XDR, protecting email and collaboration.
Related concept
Microsoft Defender XDR
- ✓
Microsoft Defender for Identity
Why this is correct
Correct. Microsoft Defender for Identity is a core component of Defender XDR, detecting identity-based threats.
Related concept
Microsoft Defender XDR
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often mistakenly believe the suite includes only three of these four services or incorrectly include Microsoft Sentinel. In reality, all four Defender components are integral parts of Defender XDR.
Detailed technical explanation
How to think about this question
Under the hood, Microsoft Defender XDR uses a shared signal repository and common analytics engine to correlate alerts from its components (Endpoint, Office 365, Identity, Cloud Apps) into a single incident graph. For example, a suspicious sign-in detected by Defender for Identity can be cross-referenced with a file download event from Defender for Cloud Apps and a phishing email from Defender for Office 365, enabling automated remediation like user account blocking or device isolation. This unified approach reduces mean time to respond (MTTR) by eliminating siloed alert triage.
KKey Concepts to Remember
- Microsoft Defender XDR
- Microsoft Defender for Endpoint
- Microsoft Defender for Office 365
- Microsoft Defender for Cloud Apps
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
Microsoft Defender XDR
Real-world example
How this comes up in practice
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.
What to study next
Got this wrong? Here's your next step.
Review microsoft Defender XDR, then practise related MS-900 questions on the same topic to reinforce the concept.
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Describe Microsoft 365 apps and services — study guide chapter
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FAQ
Questions learners often ask
What does this MS-900 question test?
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Microsoft Defender XDR.
What is the correct answer to this question?
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, email, and cloud apps. It consists of four core services: Microsoft Defender for Endpoint, Microsoft Defender for Office 365, Microsoft Defender for Identity, and Microsoft Defender for Cloud Apps. Microsoft Sentinel is a separate SIEM service that can ingest data from Defender XDR but is not part of the suite itself.
What should I do if I get this MS-900 question wrong?
Review microsoft Defender XDR, then practise related MS-900 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Microsoft Defender XDR
About these practice questions
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Same concept, more angles
1 more ways this is tested on MS-900
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which THREE Microsoft 365 services are part of Microsoft Defender XDR (Extended Detection and Response)? (Select three.)
hard- ✓ A.Microsoft Defender for Endpoint
- B.Microsoft Purview
- ✓ C.Microsoft Defender for Identity
- D.Microsoft Sentinel
- ✓ E.Microsoft Defender for Office 365
Why A: 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.
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Last reviewed: Jun 24, 2026
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