The answer is the External collaboration settings in Microsoft Entra ID. This is correct because these settings include a domain-based allowlist or blocklist that directly controls guest invitation behavior at the domain level; by adding contoso.com to the deny list, invitations to that specific domain are blocked while all other external domains remain permitted. On the MS-102 exam, this concept tests your understanding of B2B collaboration governance, often appearing as a scenario where you must distinguish between cross-tenant access settings and external collaboration settings—a common trap is confusing the global allow/block list with per-organization trust settings. Remember the memory tip: “Deny the domain, not the directory”—you are blocking a domain string, not a tenant ID, so the External collaboration settings blade is your target.
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.
An administrator wants to prevent users from inviting guest users from the domain 'contoso.com' to the tenant. The administrator needs to block all invitations for that specific domain while allowing invitations from all other external domains. Which setting in Microsoft Entra ID should be configured?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
External collaboration settings
External collaboration settings in Microsoft Entra ID (formerly Azure AD) allow administrators to configure domain-based restrictions for B2B collaboration invitations. By adding 'contoso.com' to the 'Deny list' under 'Cross-tenant access settings' or specifically within the 'External collaboration settings' blade, invitations to that domain are blocked while all other external domains remain allowed. This setting directly controls the guest invitation behavior at the domain 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.
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Cross-tenant access settings
Why it's wrong here
Cross-tenant access settings control collaboration with specific Microsoft Entra ID tenants, not individual domains.
✓
External collaboration settings
Why this is correct
External collaboration settings allow you to block invitations to specific domains by adding them to the blocked domains list.
Related concept
Read the scenario before looking for a memorised answer.
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User settings
Why it's wrong here
User settings in Microsoft Entra ID do not include domain-specific invitation blocking.
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Domain federation
Why it's wrong here
Domain federation is used to configure authentication with external identity providers, not to block invitations.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'Cross-tenant access settings' (which manage tenant-to-tenant trust and access) with 'External collaboration settings' (which control domain-level invitation restrictions), leading them to select Option A incorrectly.
Detailed technical explanation
How to think about this question
Under the hood, the 'External collaboration settings' leverage the B2B invitation API and the 'allowedDomainNames' and 'blockedDomainNames' properties in the directory settings. When a domain is added to the blocked list, the Entra ID invitation redemption process checks this list before generating the invitation URL; if the domain matches, the invitation is denied with an error. In a real-world scenario, an organization might block a competitor's domain while allowing partners from other domains, ensuring compliance with data-sharing policies.
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: External collaboration settings — External collaboration settings in Microsoft Entra ID (formerly Azure AD) allow administrators to configure domain-based restrictions for B2B collaboration invitations. By adding 'contoso.com' to the 'Deny list' under 'Cross-tenant access settings' or specifically within the 'External collaboration settings' blade, invitations to that domain are blocked while all other external domains remain allowed. This setting directly controls the guest invitation behavior at the domain level.
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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Question Discussion
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