The answer is cross-tenant access settings, Conditional Access policies for guest users, and identity governance for access reviews. These three configurations are essential for a secure B2B collaboration configuration in Microsoft Entra ID because cross-tenant access settings define which external organizations are allowed and what trust settings (like MFA and device compliance) are honored, while Conditional Access policies enforce granular controls such as requiring phishing-resistant authentication or blocking untrusted locations for guest users. Identity governance, through access reviews, ensures that partner access is periodically recertified and automatically revoked when no longer needed, preventing lingering permissions. On the Microsoft Cybersecurity Architect exam, this scenario tests your ability to layer security controls for external collaboration rather than relying on a single setting; a common trap is forgetting that cross-tenant access settings must be explicitly configured to trust a partner’s MFA, or assuming that B2B users are automatically subject to your tenant’s Conditional Access policies without an explicit policy targeting guest users. Memory tip: think “Settings, Policies, Reviews” as the three pillars of secure B2B.
SC-100 Practice Question: Design solutions that align with security best practices and priorities
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. 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 organization is designing a secure access solution for a partner company that needs to access specific SharePoint Online sites. You need to implement Microsoft Entra ID B2B collaboration. Which THREE configurations are essential for a secure B2B collaboration setup?
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 in Microsoft Entra ID
Option A is correct because cross-tenant access settings in Microsoft Entra ID allow you to control inbound and outbound access for B2B collaboration, including trust settings for MFA and device compliance. This is essential to define which partner tenants can access your resources and under what conditions, preventing unauthorized access.
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 cross-tenant access settings in Microsoft Entra ID
Why this is correct
Cross-tenant access settings control trust and access policies with partner tenants.
Related concept
Read the scenario before looking for a memorised answer.
✓
Enable multi-factor authentication (MFA) for guest users
Read the scenario before looking for a memorised answer.
✗
Use B2B direct connect for SharePoint site access
Why it's wrong here
B2B direct connect is for Teams shared channels, not SharePoint site access.
✗
Allow all external domains to invite users without restrictions
Why it's wrong here
Allowing all domains without restrictions poses a security risk.
✓
Set Conditional Access policies that apply to guest users
Why this is correct
Conditional Access policies enforce security requirements like MFA for guests.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing B2B direct connect (for Teams shared channels) with B2B collaboration (for SharePoint and other apps), leading candidates to select Option C incorrectly.
Detailed technical explanation
How to think about this question
B2B collaboration uses the SAML or WS-Federation protocol for identity federation, where guest users authenticate with their home tenant and receive a token for the resource tenant. Cross-tenant access settings leverage the Entra ID trust framework to enforce MFA or device compliance from the guest's home tenant, reducing friction while maintaining security. In a real-world scenario, you might configure a specific partner tenant ID in cross-tenant access to automatically trust their MFA claims, avoiding redundant MFA prompts.
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 SC-100 question in full detail.
Design solutions that align with security best practices and priorities — This question tests Design solutions that align with security best practices and priorities — 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 in Microsoft Entra ID — Option A is correct because cross-tenant access settings in Microsoft Entra ID allow you to control inbound and outbound access for B2B collaboration, including trust settings for MFA and device compliance. This is essential to define which partner tenants can access your resources and under what conditions, preventing unauthorized access.
What should I do if I get this SC-100 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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