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. 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 financial services company must prevent users from accidentally sharing sensitive customer data externally. They want to block sharing of any document containing a credit card number via email or SharePoint. What combination of Microsoft 365 compliance solutions 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
✓
Data Loss Prevention (DLP) policies
Data Loss Prevention (DLP) policies in Microsoft Purview are specifically designed to detect and block the sharing of sensitive information, such as credit card numbers, across email (Exchange Online) and SharePoint. By scanning content for predefined sensitive info types (e.g., credit card numbers using regex patterns from the DLP engine), DLP can automatically block or warn users before external sharing occurs, meeting the company'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.
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Sensitivity labels and Microsoft Purview Information Protection (Microsoft Purview Information Protection)
Why it's wrong here
Labels classify content but require DLP to enforce blocking actions on sharing.
✓
Data Loss Prevention (DLP) policies
Why this is correct
DLP policies detect sensitive data and block sharing actions automatically across services.
Related concept
Read the scenario before looking for a memorised answer.
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Microsoft Purview Compliance Manager
Why it's wrong here
Compliance Manager assesses compliance posture, does not block data sharing.
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Exchange Online Protection (EOP) and Microsoft Defender for Microsoft 365
Why it's wrong here
These protect against threats like malware and phishing, not against accidental sharing of sensitive data.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse sensitivity labels (which classify and protect data at rest) with DLP (which monitors and blocks data in motion), leading them to choose Option A, even though DLP is the correct solution for preventing accidental external sharing of sensitive content like credit card numbers.
Detailed technical explanation
How to think about this question
Under the hood, Microsoft Purview DLP uses a combination of keyword dictionaries, regular expressions, and function checks (e.g., checksum validation for credit cards via the Luhn algorithm) to identify sensitive data. When a DLP policy is triggered, it can enforce actions like blocking the email or SharePoint link, sending a notification to the user, and generating an incident report for security teams. A subtle behavior is that DLP policies can be configured with 'false positive' tuning by adjusting confidence levels or using 'policy tips' to educate users without blocking outright.
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 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 detect and block the sharing of sensitive information, such as credit card numbers, across email (Exchange Online) and SharePoint. By scanning content for predefined sensitive info types (e.g., credit card numbers using regex patterns from the DLP engine), DLP can automatically block or warn users before external sharing occurs, meeting the company'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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