MS-900 Practice Question: Describe security, compliance, privacy, and trust in Microsoft 365
This MS-900 practice question tests your understanding of describe security, compliance, privacy, and trust in microsoft 365. 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 company wants to ensure that sensitive documents stored in SharePoint Online are automatically classified and protected if they contain credit card numbers or social security numbers. Which Microsoft Purview feature should they implement?
Why wrong: DLM manages retention and deletion policies, not detection or protection of sensitive data in use.
B
Information Protection (Sensitivity labels)
Why wrong: Sensitivity labels are used for classification and protection but are typically applied manually or via auto-labeling, not focused on real-time detection of specific data patterns like credit card numbers.
C
Data Loss Prevention (DLP) policies
DLP policies scan for sensitive data types and can automatically prevent sharing or encrypt content, meeting the requirement perfectly.
D
Insider Risk Management
Why wrong: Insider Risk Management identifies risky user behaviors, not the automatic detection of sensitive content.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Data Loss Prevention (DLP) policies
Data Loss Prevention (DLP) policies in Microsoft Purview are specifically designed to automatically detect, classify, and protect sensitive information such as credit card numbers and social security numbers. When a DLP policy is configured with sensitive information types (e.g., Credit Card Number, U.S. Social Security Number), it can scan documents in SharePoint Online and automatically apply protective actions like blocking access or triggering notifications. This makes DLP the correct feature for the described 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.
✗
Data Lifecycle Management (DLM)
Why it's wrong here
DLM manages retention and deletion policies, not detection or protection of sensitive data in use.
✗
Information Protection (Sensitivity labels)
Why it's wrong here
Sensitivity labels are used for classification and protection but are typically applied manually or via auto-labeling, not focused on real-time detection of specific data patterns like credit card numbers.
✓
Data Loss Prevention (DLP) policies
Why this is correct
DLP policies scan for sensitive data types and can automatically prevent sharing or encrypt content, meeting the requirement perfectly.
Related concept
Read the scenario before looking for a memorised answer.
✗
Insider Risk Management
Why it's wrong here
Insider Risk Management identifies risky user behaviors, not the automatic detection of sensitive content.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Data Loss Prevention (DLP) with Information Protection (Sensitivity labels), but DLP is the correct choice because it is designed for automatic content-based detection of sensitive data patterns, whereas sensitivity labels are primarily for manual or rule-based classification without native pattern matching for specific data types like credit card numbers.
Detailed technical explanation
How to think about this question
DLP policies in Microsoft Purview use built-in sensitive information types (SITs) that are defined by regular expressions and keyword lists, such as the Credit Card Number SIT (which validates against the Luhn algorithm) and the U.S. Social Security Number SIT (which checks format and checksum). When a DLP policy is applied to SharePoint Online, it scans documents at rest and in transit, and can automatically apply actions like blocking external sharing, sending policy tips, or generating incident reports. A real-world scenario is a healthcare organization that uses DLP to prevent patient credit card data from being shared externally via SharePoint links.
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 security, compliance, privacy, and trust in Microsoft 365 — This question tests Describe security, compliance, privacy, and trust in Microsoft 365 — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Data Loss Prevention (DLP) policies — Data Loss Prevention (DLP) policies in Microsoft Purview are specifically designed to automatically detect, classify, and protect sensitive information such as credit card numbers and social security numbers. When a DLP policy is configured with sensitive information types (e.g., Credit Card Number, U.S. Social Security Number), it can scan documents in SharePoint Online and automatically apply protective actions like blocking access or triggering notifications. This makes DLP the correct feature for the described 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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