The answer is Microsoft Entra Application Proxy, as it is the correct Microsoft security service for securing a legacy on-premises web app with no modern authentication support under a zero-trust framework. This service acts as a reverse proxy, publishing the legacy app to the internet through Entra ID’s authentication layer, enabling conditional access policies and detailed audit logging without requiring any code changes or a VPN. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how to bridge legacy applications into a modern identity-centric security model—a common trap is confusing it with Defender for Cloud Apps, which governs cloud apps, or Azure AD B2C, which is for customer-facing apps. The key memory tip is to think of Application Proxy as the “bridge” for old apps: it brings on-premises legacy apps into Entra ID’s control, enforcing zero-trust access and logging every request, exactly as required for healthcare auditing.
SC-100 Practice Question: Design security solutions for applications and data
This SC-100 practice question tests your understanding of design security solutions for applications and data. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 healthcare organization is designing a zero-trust application security strategy. They use Microsoft Entra ID for identity and plan to deploy a legacy on-premises web application with no modern authentication support. The solution must ensure that only authorized users can access the app and that access is logged for auditing. Which Microsoft security service should they use to secure access?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Microsoft Entra application proxy
Microsoft Entra application proxy provides secure remote access and conditional access for on-premises apps without requiring VPN or changes to the app. Option A is correct. Option B is wrong because Defender for Cloud Apps is for cloud apps. Option C is wrong because Azure AD B2C is for customer-facing apps. Option D is wrong because Microsoft Intune is for device management, not app 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.
✗
Azure AD B2C
Why it's wrong here
Designed for customer-facing identity management, not enterprise app access.
✓
Microsoft Entra application proxy
Why this is correct
Provides secure remote access and conditional access for on-premises web apps without modifying the app.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Defender for Cloud Apps
Why it's wrong here
Used for securing cloud apps, not for on-premises legacy apps.
✗
Microsoft Intune
Why it's wrong here
Focuses on device management and mobile application management, not directly on app access control.
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 applications and data — This question tests Design security solutions for applications and data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Entra application proxy — Microsoft Entra application proxy provides secure remote access and conditional access for on-premises apps without requiring VPN or changes to the app. Option A is correct. Option B is wrong because Defender for Cloud Apps is for cloud apps. Option C is wrong because Azure AD B2C is for customer-facing apps. Option D is wrong because Microsoft Intune is for device management, not app access.
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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