MS-900 Describe Microsoft 365 apps and services Practice Question
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.
A company uses Microsoft 365 E5 licenses. The security team wants to automatically remediate advanced threats detected on endpoints without manual intervention. Which Microsoft 365 service should they use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Defender XDR
Microsoft Defender XDR (Extended Detection and Response) is the correct service because it provides automated investigation and remediation capabilities for advanced threats detected on endpoints. It uses AI-driven playbooks to automatically contain or remove threats without manual intervention, which aligns directly with the security team's requirement.
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.
✗
Microsoft Intune
Why it's wrong here
Intune is for mobile device management (MDM) and mobile application management (MAM), not automated threat remediation.
✗
Microsoft Purview
Why it's wrong here
Purview focuses on data governance, compliance, and risk management, not endpoint threat remediation.
✓
Microsoft Defender XDR
Why this is correct
Defender XDR provides automated investigation and remediation of advanced threats across endpoints.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Sentinel
Why it's wrong here
Sentinel is a cloud-native SIEM and SOAR, not specifically for automatic endpoint remediation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Microsoft Sentinel's SIEM/SOAR capabilities with automated endpoint remediation, but Sentinel requires integration with Defender XDR to execute such actions, whereas Defender XDR provides native automated remediation directly on endpoints.
Detailed technical explanation
How to think about this question
Microsoft Defender XDR leverages the Microsoft 365 Defender portal to correlate signals from Defender for Endpoint, Defender for Office 365, Defender for Identity, and Defender for Cloud Apps. Its automated remediation actions include isolating devices, quarantining files, and killing processes, all governed by built-in or custom playbooks that use the 'Automated Investigation and Response' (AIR) engine. In a real-world scenario, if a ransomware variant is detected on a workstation, Defender XDR can automatically isolate the machine from the network and block the malicious file across all endpoints, reducing response time from hours to seconds.
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
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-900 question in full detail.
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Defender XDR — Microsoft Defender XDR (Extended Detection and Response) is the correct service because it provides automated investigation and remediation capabilities for advanced threats detected on endpoints. It uses AI-driven playbooks to automatically contain or remove threats without manual intervention, which aligns directly with the security team's requirement.
What should I do if I get this MS-900 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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