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 and wants to implement a zero-trust security model. They need to ensure that all external file sharing requires multi-factor authentication (MFA) and that sensitive documents are automatically labeled. Which combination of services 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 Entra Conditional Access and Microsoft Purview Information Protection
Microsoft Entra Conditional Access can enforce MFA for external file sharing by requiring MFA as a condition for accessing SharePoint/OneDrive resources. Microsoft Purview Information Protection provides automatic sensitivity labeling for documents based on content or context, ensuring sensitive data is labeled without manual intervention. Together, these services directly address the zero-trust requirements of MFA for external sharing and automatic document labeling.
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.
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Microsoft Defender XDR and Microsoft Purview Audit
Why it's wrong here
Defender XDR is for threat detection; Purview Audit logs activities but does not auto-label.
✗
Microsoft Intune and Microsoft Defender for Cloud Apps
Why it's wrong here
Intune manages devices, not file sharing MFA directly.
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Microsoft Defender for Cloud Apps and Microsoft Purview Data Lifecycle Management
Why it's wrong here
Defender for Cloud Apps does not auto-label; Purview Data Lifecycle Management manages retention.
✓
Microsoft Entra Conditional Access and Microsoft Purview Information Protection
Why this is correct
Conditional Access enforces MFA; Information Protection auto-labels sensitive content.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Microsoft Defender for Cloud Apps (a CASB) with Entra Conditional Access for MFA enforcement, or assume Purview Data Lifecycle Management handles labeling instead of Information Protection, leading them to select options that address only one requirement or use the wrong service for the task.
Detailed technical explanation
How to think about this question
Entra Conditional Access policies use conditions like 'Client apps: Exchange ActiveSync' or 'Locations: External networks' to trigger MFA, and can be scoped to SharePoint Online to require MFA for external sharing. Purview Information Protection uses trainable classifiers or exact data match (EDM) to automatically apply sensitivity labels via client-side labeling (AIP client) or service-side labeling (auto-labeling policies in Microsoft 365 Compliance Center). In a zero-trust model, this ensures that even if a user's token is compromised, MFA blocks unauthorized external sharing, and labeling prevents data leakage by classifying documents at creation or modification.
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 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.
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 Entra Conditional Access and Microsoft Purview Information Protection — Microsoft Entra Conditional Access can enforce MFA for external file sharing by requiring MFA as a condition for accessing SharePoint/OneDrive resources. Microsoft Purview Information Protection provides automatic sensitivity labeling for documents based on content or context, ensuring sensitive data is labeled without manual intervention. Together, these services directly address the zero-trust requirements of MFA for external sharing and automatic document labeling.
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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