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. 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.
Your organization uses Microsoft 365 E5 and experiences a security incident where a user's account is compromised. You need to immediately prevent the attacker from accessing Microsoft 365 services while preserving the user's data for investigation. Which action should you take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Block sign-in for the user in Microsoft Entra ID
Blocking sign-in for the user in Microsoft Entra ID immediately prevents the attacker from authenticating to any Microsoft 365 service, while the user's data remains intact in Exchange Online, SharePoint, and OneDrive for forensic analysis. This action does not delete or alter any data, preserving the full investigation trail.
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.
✓
Block sign-in for the user in Microsoft Entra ID
Why this is correct
Blocking sign-in immediately prevents all access while preserving data for investigation.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Delete the user account from Microsoft Entra ID
Why it's wrong here
Deleting the account removes the data permanently, which is not desired.
✗
Revoke the user's sessions using Microsoft Entra ID
Why it's wrong here
Revoking sessions may not immediately block future sign-ins if the attacker has a different token.
✗
Reset the user's password
Why it's wrong here
Resetting password does not invalidate existing tokens; attacker may still have access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'revoke sessions' (which only kills current sessions but allows re-authentication) with 'block sign-in' (which prevents all future authentication), leading them to choose Option C as a quick fix without realizing the attacker can simply log back in.
Detailed technical explanation
How to think about this question
When you block sign-in in Microsoft Entra ID, the user's account is immediately disabled for authentication across all Microsoft 365 services via the Entra ID authentication pipeline, which checks the 'AccountEnabled' attribute before issuing any access or refresh tokens. This action does not affect existing sessions until token expiry, but combined with session revocation (which you can do separately), it provides a complete lockdown. In a real-world incident response, blocking sign-in is the first step in the 'containment' phase, followed by password reset and session revocation to fully secure the account.
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: Block sign-in for the user in Microsoft Entra ID — Blocking sign-in for the user in Microsoft Entra ID immediately prevents the attacker from authenticating to any Microsoft 365 service, while the user's data remains intact in Exchange Online, SharePoint, and OneDrive for forensic analysis. This action does not delete or alter any data, preserving the full investigation trail.
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.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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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