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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 hospital uses Microsoft 365 E5 and needs to ensure that patient health information (PHI) is not accidentally shared externally. They want to block sharing of emails containing credit card numbers or medical record numbers. Which Microsoft Purview feature should they configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Purview Data Loss Prevention (DLP)
Microsoft Purview Data Loss Prevention (DLP) is the correct feature because it is specifically designed to detect and block the accidental sharing of sensitive data, such as credit card numbers and medical record numbers, via email. DLP uses deep content analysis with built-in sensitive information types (e.g., Credit Card Number, U.S. Medical Record Number) to scan emails and enforce policies that prevent external sharing. This directly addresses the hospital's requirement to protect PHI from being leaked externally.
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 Purview Privileged Access Management
Why it's wrong here
PAM controls privileged admin access, not data sharing.
✓
Microsoft Purview Data Loss Prevention (DLP)
Why this is correct
DLP policies can automatically detect and block sharing of sensitive information.
Related concept
Read the scenario before looking for a memorised answer.
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Microsoft Purview Sensitivity Labels
Why it's wrong here
Labels classify data but do not block sharing by themselves.
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Microsoft Purview Information Barriers
Why it's wrong here
Information Barriers prevent communication between certain groups, not data leak prevention.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Sensitivity Labels with DLP, not realizing that labels are for classification and protection (e.g., encryption), while DLP is the enforcement engine that scans content and blocks sharing based on those labels or built-in sensitive data types.
Detailed technical explanation
How to think about this question
Under the hood, DLP policies in Exchange Online use transport rules and the Microsoft 365 data classification service to match content against predefined sensitive information types, which are defined by regular expressions and keyword lists (e.g., for credit card numbers, the Luhn checksum is validated). When a match is found, DLP can apply actions such as blocking the message, sending a notification, or encrypting the email, all without requiring user intervention. A real-world scenario is a healthcare organization that configures a DLP policy to automatically block any email containing a U.S. Medical Record Number (e.g., pattern like 'MRN-1234567') from being sent to external recipients, with an override option for compliance-approved exceptions.
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 Purview Data Loss Prevention (DLP) — Microsoft Purview Data Loss Prevention (DLP) is the correct feature because it is specifically designed to detect and block the accidental sharing of sensitive data, such as credit card numbers and medical record numbers, via email. DLP uses deep content analysis with built-in sensitive information types (e.g., Credit Card Number, U.S. Medical Record Number) to scan emails and enforce policies that prevent external sharing. This directly addresses the hospital's requirement to protect PHI from being leaked externally.
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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