SC-100 Design a Zero Trust strategy and architecture Practice Question
This SC-100 practice question tests your understanding of design a zero trust strategy and architecture. 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.
A company, Fabrikam, has a hybrid identity environment with on-premises Active Directory synchronized to Azure AD using Azure AD Connect. They have implemented a Zero Trust strategy that includes requiring multi-factor authentication (MFA) for all users accessing cloud applications. They use Conditional Access policies to enforce MFA. Recently, they noticed that users who authenticate from the on-premises network are not being prompted for MFA when accessing cloud apps, even though the Conditional Access policy is configured to require MFA for all users. The network location is not excluded in the policy. The Conditional Access policy is enabled and in 'Enforce' mode. The users' devices are not domain-joined. What is the most likely reason for this behavior?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Users are using legacy authentication protocols that do not support MFA
The most likely reason is that users are using legacy authentication protocols (e.g., POP3, IMAP, SMTP, or older Office clients) that do not support modern authentication and thus cannot enforce MFA via Conditional Access. Even though the policy requires MFA, legacy protocols bypass the Conditional Access engine entirely, allowing authentication without MFA prompts.
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.
✗
Azure AD Connect is not configured for Pass-through Authentication
Why it's wrong here
Pass-through Authentication is not required for MFA; password hash sync works and MFA is still enforced.
✗
The Conditional Access policy does not include session controls
Why it's wrong here
Session controls are not required for MFA; grant controls are sufficient.
✗
The Conditional Access policy is not targeting the correct user group
Why it's wrong here
The policy targets all users, so this is not the issue.
✓
Users are using legacy authentication protocols that do not support MFA
Why this is correct
Legacy authentication protocols like POP, IMAP, SMTP do not support MFA and can bypass Conditional Access policies if not blocked.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
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 that candidates often focus on policy configuration (e.g., user targeting, session controls) or authentication methods, but the real issue is that legacy protocols completely bypass Conditional Access, making MFA enforcement impossible regardless of policy settings.
Detailed technical explanation
How to think about this question
Legacy authentication protocols (e.g., POP3, IMAP4, SMTP, and older versions of ActiveSync) do not support modern authentication flows like OAuth 2.0 or SAML, which are required for Conditional Access to intercept and enforce MFA. When a client uses such a protocol, Azure AD treats the request as a 'non-interactive' sign-in and skips Conditional Access evaluation, allowing access even if MFA is required. This is a common gap in Zero Trust implementations where organizations overlook blocking legacy authentication at the tenant level or via Conditional Access.
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 a Zero Trust strategy and architecture — This question tests Design a Zero Trust strategy and architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Users are using legacy authentication protocols that do not support MFA — The most likely reason is that users are using legacy authentication protocols (e.g., POP3, IMAP, SMTP, or older Office clients) that do not support modern authentication and thus cannot enforce MFA via Conditional Access. Even though the policy requires MFA, legacy protocols bypass the Conditional Access engine entirely, allowing authentication without MFA prompts.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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