MS-900 Describe Microsoft 365 apps and services Practice Question
This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. 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.
Refer to the exhibit. The JSON snippet represents a Microsoft Purview sensitivity label policy. An administrator wants to prevent external users from accessing documents labeled 'Highly Confidential'. Which element in the policy achieves this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
blockAccess
The 'blockAccess' action in a Microsoft Purview sensitivity label policy is specifically designed to prevent users from accessing content that has been labeled with a particular sensitivity level. In this case, setting 'blockAccess' to 'true' for the 'Highly Confidential' label ensures that external users cannot open or interact with documents carrying that label, enforcing access control at the label level.
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.
✓
blockAccess
Why this is correct
blockAccess is set to true, preventing unauthorized access.
Related concept
Read the scenario before looking for a memorised answer.
✗
encrypt
Why it's wrong here
encrypt deals with encryption, not access control.
✗
applyWatermark
Why it's wrong here
applyWatermark adds a watermark.
✗
labels
Why it's wrong here
labels is the label reference, not an action.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'blockAccess' with 'encrypt', assuming that encryption alone prevents access, but encryption only protects the data from unauthorized decryption, not from authorized users or external users who might have been granted permissions through the label policy.
Detailed technical explanation
How to think about this question
Under the hood, the 'blockAccess' action leverages Microsoft Purview's Information Protection (MIP) SDK to enforce conditional access policies at the application layer, such as in Microsoft 365 apps or Azure Information Protection client. When a user attempts to open a labeled document, the MIP SDK checks the policy and, if 'blockAccess' is true for that label, the application denies access and may display an error message. This is distinct from encryption, which uses Azure Rights Management (RMS) to protect the file but still allows authorized users to decrypt and access it.
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 Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: blockAccess — The 'blockAccess' action in a Microsoft Purview sensitivity label policy is specifically designed to prevent users from accessing content that has been labeled with a particular sensitivity level. In this case, setting 'blockAccess' to 'true' for the 'Highly Confidential' label ensures that external users cannot open or interact with documents carrying that label, enforcing access control at the label level.
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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