The correct answer is to configure cross-tenant access settings for partner.com with inbound access enabled and block all other domains by default. This is correct because Microsoft Entra ID’s cross-tenant access settings provide granular control over inbound B2B collaboration, allowing you to explicitly trust specific external domains for self-service sign-up while using a default block policy to reject all others. On the MS-102 exam, this scenario tests your ability to distinguish between cross-tenant access settings (which control domain-level trust) and external collaboration settings (which manage broader invitation policies). A common trap is confusing the default allow setting with the need to explicitly block; remember that the default behavior for cross-tenant access is to allow all domains unless you configure a default block. For a quick memory tip, think “trust the partner, block the rest” — you set inbound access for the specific domain and flip the default to block.
MS-102 Deploy and manage a Microsoft 365 tenant Practice Question
This MS-102 practice question tests your understanding of deploy and manage a microsoft 365 tenant. 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.
Your Microsoft 365 tenant has a Microsoft Entra ID tenant with custom B2B collaboration settings. You need to allow external users from a specific domain (partner.com) to self-service sign up, but block all other external domains. What should you configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure cross-tenant access settings for partner.com with inbound access enabled and block other domains by default.
Option C is correct because cross-tenant access settings in Microsoft Entra ID allow you to configure inbound access for specific external domains (partner.com) while blocking all others by default. This granular control enables self-service sign-up for allowed domains and prevents external users from unauthorized domains from signing up, directly meeting the requirement.
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.
✗
Configure SharePoint Online external sharing settings to allow partner.com only.
Why it's wrong here
SharePoint settings control sharing, not self-service sign-up.
✗
Set guest user access permissions to 'Guest user access is restricted'.
Why it's wrong here
This limits guest permissions, not sign-up.
✓
Configure cross-tenant access settings for partner.com with inbound access enabled and block other domains by default.
Why this is correct
Cross-tenant access settings control inbound B2B collaboration, including self-service sign-up.
Related concept
Read the scenario before looking for a memorised answer.
✗
Add partner.com to the B2B collaboration allowlist in Microsoft Entra ID.
Why it's wrong here
Allowlist controls invitations, not self-service sign-up.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse SharePoint external sharing settings (which control content sharing) with Microsoft Entra ID B2B collaboration settings (which control identity and access for external users), leading them to select Option A instead of the correct cross-tenant access configuration.
Detailed technical explanation
How to think about this question
Cross-tenant access settings use the Microsoft Entra ID B2B collaboration framework, which relies on the external identity provider (e.g., partner.com's Azure AD or any SAML/WS-Fed IdP) to authenticate users. When inbound access is enabled for a domain, users from that domain can redeem invitations or self-service sign up via the 'Sign up for an organization' portal. The default block for all other domains is enforced by the 'Default settings' toggle, which can be set to block inbound access, ensuring only explicitly allowed domains can participate.
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-102 question in full detail.
Deploy and manage a Microsoft 365 tenant — This question tests Deploy and manage a Microsoft 365 tenant — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure cross-tenant access settings for partner.com with inbound access enabled and block other domains by default. — Option C is correct because cross-tenant access settings in Microsoft Entra ID allow you to configure inbound access for specific external domains (partner.com) while blocking all others by default. This granular control enables self-service sign-up for allowed domains and prevents external users from unauthorized domains from signing up, directly meeting the requirement.
What should I do if I get this MS-102 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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