The answer is Microsoft Entra Conditional Access policies. This is the correct choice because Conditional Access acts as a policy-based decision engine that evaluates signals like device compliance, location, and risk before granting access to corporate resources, allowing you to enforce controls such as requiring multi-factor authentication or blocking access entirely for unmanaged BYOD devices that cannot be enrolled in Intune. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how to secure hybrid and bring-your-own-device environments without relying on device management—a common trap is assuming Intune enrollment is mandatory for all security policies, but Conditional Access fills that gap by applying context-aware rules at the identity layer. Remember the memory tip: “If you can’t manage the device, manage the access.”
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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.
Your organization uses Microsoft Intune to manage endpoints. The security team wants to ensure that devices that cannot be enrolled in Intune (e.g., unmanaged BYOD devices) are still subject to security policies when accessing corporate resources. Which Microsoft Entra ID feature should you use?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Entra Conditional Access policies
Option B is correct because Microsoft Entra Conditional Access policies can enforce access controls based on device compliance, including requiring MFA or blocking access from unmanaged devices. Option A is wrong because Intune enrollment is only for managed devices. Option C is wrong because Microsoft Defender for Endpoint (now part of Defender XDR) provides threat detection but not access policy enforcement. Option D is wrong because Windows Defender Application Control is for code integrity on managed devices.
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.
✓
Microsoft Entra Conditional Access policies
Why this is correct
Conditional Access can block or limit access from unmanaged devices, enforcing MFA or session controls.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Intune enrollment policies
Why it's wrong here
Enrollment policies apply only to devices that are enrolled in Intune.
✗
Windows Defender Application Control
Why it's wrong here
WDAC controls which applications can run on a device, not access to corporate resources.
✗
Microsoft Defender for Endpoint
Why it's wrong here
Defender for Endpoint detects threats on devices but does not enforce access policies.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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.
Identify which SC-100 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Design security solutions for infrastructure — This question tests Design security solutions for infrastructure — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Entra Conditional Access policies — Option B is correct because Microsoft Entra Conditional Access policies can enforce access controls based on device compliance, including requiring MFA or blocking access from unmanaged devices. Option A is wrong because Intune enrollment is only for managed devices. Option C is wrong because Microsoft Defender for Endpoint (now part of Defender XDR) provides threat detection but not access policy enforcement. Option D is wrong because Windows Defender Application Control is for code integrity on managed devices.
What should I do if I get this SC-100 question wrong?
Identify which SC-100 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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