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.
An organization is concerned about data leakage from sensitive emails. They want to enforce encryption on emails containing financial information automatically. Which Microsoft 365 solution should they configure?
Why wrong: DLP prevents unauthorized sharing but does not automatically encrypt emails; it can integrate with encryption.
B
Microsoft Purview Message Encryption
Message Encryption uses rules to encrypt emails based on conditions like sensitive content.
C
Microsoft Purview Information Protection (Microsoft Purview Information Protection)
Why wrong: Microsoft Purview Information Protection classifies and labels documents and emails, but encryption is a separate action triggered by Microsoft Purview Information Protection policies.
D
Exchange Online Protection (EOP)
Why wrong: EOP provides anti-malware and anti-spam, not encryption.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Purview Message Encryption
Microsoft Purview Message Encryption (Option B) is the correct solution because it enables organizations to send and receive encrypted email messages, and it can be configured with mail flow rules to automatically encrypt emails containing sensitive financial information. This service leverages Azure Rights Management (Azure RMS) to provide persistent protection that follows the email, ensuring only authorized recipients can decrypt and read the content.
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) policies
Why it's wrong here
DLP prevents unauthorized sharing but does not automatically encrypt emails; it can integrate with encryption.
✓
Microsoft Purview Message Encryption
Why this is correct
Message Encryption uses rules to encrypt emails based on conditions like sensitive content.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Purview Information Protection (Microsoft Purview Information Protection)
Why it's wrong here
Microsoft Purview Information Protection classifies and labels documents and emails, but encryption is a separate action triggered by Microsoft Purview Information Protection policies.
✗
Exchange Online Protection (EOP)
Why it's wrong here
EOP provides anti-malware and anti-spam, not encryption.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Data Loss Prevention (DLP) policies with encryption capabilities, assuming DLP can automatically encrypt emails, when in fact DLP only detects and blocks or warns, while Message Encryption is the service that actually applies encryption to outbound emails.
Detailed technical explanation
How to think about this question
Under the hood, Microsoft Purview Message Encryption uses mail flow rules (transport rules) in Exchange Online to trigger encryption based on conditions such as the presence of sensitive information types (e.g., credit card numbers) or specific keywords. The encryption itself is implemented using S/MIME or OME (Office 365 Message Encryption) which wraps the email in an encrypted HTML attachment or uses Azure RMS to protect the message, requiring recipients to authenticate via a Microsoft account or one-time passcode. A subtle behavior is that encrypted messages are delivered as an HTML attachment to non-Outlook recipients, which can cause confusion if the recipient's email client does not support inline rendering.
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: Microsoft Purview Message Encryption — Microsoft Purview Message Encryption (Option B) is the correct solution because it enables organizations to send and receive encrypted email messages, and it can be configured with mail flow rules to automatically encrypt emails containing sensitive financial information. This service leverages Azure Rights Management (Azure RMS) to provide persistent protection that follows the email, ensuring only authorized recipients can decrypt and read the content.
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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