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.
Contoso Ltd. is a medium-sized company with 2,000 users. They use Microsoft 365 E5 and have recently deployed Microsoft Teams for collaboration. The IT department has received complaints that external partners (guests) can see internal team names and member lists in the Teams directory. The compliance team requires that external guests must only see teams they are directly added to, and they must not be able to search for other teams or see internal team members who are not members of the same team. Additionally, the HR team wants to use a custom app in Teams that allows employees to submit leave requests, and this app must be available to all employees without requiring them to install anything manually. The IT admin needs to configure Teams settings to meet these requirements. Which two actions should the admin take? (Choose two. Each correct answer is part of the solution.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disable 'Show all teams' in the Teams admin center to prevent guests from seeing teams they are not members of.
Option A is correct because disabling 'Show all teams' in the Teams admin center (under Teams settings) prevents guests from seeing teams they are not members of in the Teams directory. This directly addresses the compliance requirement that external guests must only see teams they are directly added to and cannot search for other teams or see internal team members outside their own team.
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.
✓
Disable 'Show all teams' in the Teams admin center to prevent guests from seeing teams they are not members of.
Why this is correct
This setting controls team discovery for guests.
Related concept
Read the scenario before looking for a memorised answer.
✓
Create a Teams app setup policy that pins the leave request app for all users.
Why this is correct
App setup policy automatically pins apps for users.
Related concept
Read the scenario before looking for a memorised answer.
✗
Block all external access in Teams admin center to prevent guests from joining.
Why it's wrong here
Guests need to be added to specific teams.
✗
Configure external sharing settings in SharePoint admin center to limit guest access.
Why it's wrong here
This controls file sharing, not team visibility or app deployment.
✗
Enable external access in Teams admin center to allow guests to communicate with internal users.
Why it's wrong here
External access is for federation, not team visibility.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing 'external access' (federation for chat/calling) with 'guest access' (B2B collaboration for team membership), leading candidates to select options that manage federation settings instead of the specific Teams directory visibility control.
Detailed technical explanation
How to think about this question
The 'Show all teams' setting in Teams admin center controls the Teams directory search experience; when disabled, guests (Azure AD B2B users) can only see teams they are explicitly members of, and the team list is filtered accordingly. This setting works in conjunction with Azure AD external identities and Teams guest access policies, where guest user objects are subject to the same directory search restrictions as internal users when this toggle is off. In a real-world scenario, a company with 2,000 users and many external partners would use this setting to enforce least-privilege visibility, ensuring that guests cannot enumerate internal teams or discover member lists through the Teams client.
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: Disable 'Show all teams' in the Teams admin center to prevent guests from seeing teams they are not members of. — Option A is correct because disabling 'Show all teams' in the Teams admin center (under Teams settings) prevents guests from seeing teams they are not members of in the Teams directory. This directly addresses the compliance requirement that external guests must only see teams they are directly added to and cannot search for other teams or see internal team members outside their own team.
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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