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 compliance administrator needs to automatically detect when employees share documents containing a customer's credit card number via email and block such sharing before the email is sent. Which Microsoft Purview solution should they configure?
DLP policies can identify sensitive data like credit card numbers in email and block the message from being sent.
B
Information Rights Management (IRM)
Why wrong: IRM restricts actions on content after it is received (e.g., prevent forwarding), but does not block outbound email based on sensitive data patterns.
C
Sensitivity labels
Why wrong: Sensitivity labels classify and protect content but are not designed to block email transmission; they rely on label-based policies (like DLP) for enforcement.
D
Microsoft Defender for Office 365 (ATP)
Why wrong: ATP protects against phishing and malware, not against sharing sensitive data in email 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)
Data Loss Prevention (DLP) is the correct solution because it is specifically designed to automatically detect sensitive data, such as credit card numbers, in transit (e.g., email) and enforce policy actions like blocking the email before it is sent. DLP uses deep content analysis, including pattern matching against predefined sensitive information types (e.g., credit card number regex), to inspect email bodies and attachments in real time within Exchange Online.
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 Loss Prevention (DLP)
Why this is correct
DLP policies can identify sensitive data like credit card numbers in email and block the message from being sent.
Related concept
Read the scenario before looking for a memorised answer.
✗
Information Rights Management (IRM)
Why it's wrong here
IRM restricts actions on content after it is received (e.g., prevent forwarding), but does not block outbound email based on sensitive data patterns.
✗
Sensitivity labels
Why it's wrong here
Sensitivity labels classify and protect content but are not designed to block email transmission; they rely on label-based policies (like DLP) for enforcement.
✗
Microsoft Defender for Office 365 (ATP)
Why it's wrong here
ATP protects against phishing and malware, not against sharing sensitive data in email content.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Information Rights Management (IRM) with DLP because both involve protecting sensitive data, but IRM controls access after sending while DLP prevents the send action itself.
Detailed technical explanation
How to think about this question
Under the hood, DLP in Microsoft 365 uses the Exchange Transport Agent pipeline to inspect email messages as they flow through the transport service, applying conditions based on sensitive information types defined in the Microsoft 365 Compliance Center. A subtle behavior is that DLP can also inspect email attachments (e.g., Excel, PDF) by extracting text and matching patterns, and it can apply 'override' options with business justification if configured. In a real-world scenario, a DLP policy can be set to block an email containing a credit card number unless the sender provides a valid business reason, which is logged for compliance auditing.
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) — Data Loss Prevention (DLP) is the correct solution because it is specifically designed to automatically detect sensitive data, such as credit card numbers, in transit (e.g., email) and enforce policy actions like blocking the email before it is sent. DLP uses deep content analysis, including pattern matching against predefined sensitive information types (e.g., credit card number regex), to inspect email bodies and attachments in real time within Exchange Online.
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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