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. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 officer wants to ensure that all data in Microsoft 365 is encrypted using a key that the organization manages and stores in their own Azure Key Vault. Microsoft will not have access to the key. Which solution should they implement?
Why wrong: Customer Lockbox is a feature that gives customers explicit approval control over Microsoft support's access to their data, but it does not involve encryption keys.
B
Double Key Encryption (DKE)
DKE enables customers to provide a second encryption key that Microsoft does not possess, ensuring that no one (including Microsoft) can access the protected data without both keys.
C
Information Rights Management (IRM)
Why wrong: IRM uses encryption and policies to restrict actions like copying or forwarding, but the keys are managed by Microsoft, not solely by the customer.
D
Microsoft Purview Data Lifecycle Management
Why wrong: Data Lifecycle Management focuses on retention and deletion of data, not on encryption key control.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Double Key Encryption (DKE)
Double Key Encryption (DKE) is the correct solution because it allows an organization to use their own key stored in Azure Key Vault for encrypting sensitive Microsoft 365 data, while ensuring that Microsoft cannot access the key. With DKE, the encryption key is split into two parts: one managed by Microsoft and one managed by the customer in their own Azure Key Vault, so both parties must be compromised to decrypt the data. This meets the compliance officer's requirement for exclusive control over the encryption key.
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.
✗
Customer Lockbox
Why it's wrong here
Customer Lockbox is a feature that gives customers explicit approval control over Microsoft support's access to their data, but it does not involve encryption keys.
✓
Double Key Encryption (DKE)
Why this is correct
DKE enables customers to provide a second encryption key that Microsoft does not possess, ensuring that no one (including Microsoft) can access the protected data without both keys.
Related concept
Read the scenario before looking for a memorised answer.
✗
Information Rights Management (IRM)
Why it's wrong here
IRM uses encryption and policies to restrict actions like copying or forwarding, but the keys are managed by Microsoft, not solely by the customer.
✗
Microsoft Purview Data Lifecycle Management
Why it's wrong here
Data Lifecycle Management focuses on retention and deletion of data, not on encryption key control.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Customer Lockbox with encryption key control, but Customer Lockbox only controls access requests, not the encryption keys themselves.
Detailed technical explanation
How to think about this question
DKE uses two keys: one stored in Azure Key Vault (customer-managed) and one stored in Microsoft's service (Microsoft-managed), and both are required to decrypt the data, which is enforced by the Microsoft 365 encryption service. This is implemented through the Microsoft Purview Information Protection client and requires the customer to configure a key in their Azure Key Vault with specific permissions for the Microsoft 365 service principal. A real-world scenario is a financial institution that must ensure that even if Microsoft's infrastructure is compromised, their data remains encrypted because the attacker would also need the customer's key from Azure Key Vault.
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: Double Key Encryption (DKE) — Double Key Encryption (DKE) is the correct solution because it allows an organization to use their own key stored in Azure Key Vault for encrypting sensitive Microsoft 365 data, while ensuring that Microsoft cannot access the key. With DKE, the encryption key is split into two parts: one managed by Microsoft and one managed by the customer in their own Azure Key Vault, so both parties must be compromised to decrypt the data. This meets the compliance officer's requirement for exclusive control over the encryption key.
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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