The answer is Microsoft Entra Application Proxy. This solution is correct because it enables legacy on-premises web applications using Windows Integrated Authentication to be published to Azure App Service without any code modifications, as the proxy handles the authentication translation from Entra ID to Kerberos on the backend. For the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how to bridge legacy authentication protocols with modern cloud identity services, often appearing as a trap where candidates mistakenly choose Azure AD Domain Services or EasyAuth, which would require significant code changes or separate authentication flows. The key insight is that Application Proxy acts as a reverse proxy, allowing the app to remain unchanged while users authenticate via Entra ID. Memory tip: think "Proxy for legacy, no code to tweak" — if the app can't be modified, the proxy is your go-to for seamless authentication migration.
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. 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 company is migrating a legacy on-premises web application to Azure App Service. The application uses Windows Integrated Authentication and connects to a SQL Server database. You need to design a security solution that minimizes changes to the application code while ensuring secure authentication and data protection. What should you use to authenticate users?
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
Option C is correct because Microsoft Entra ID Application Proxy allows legacy apps to use Entra ID authentication without modifying code, by publishing the app through the proxy. Option A is wrong because Azure AD (now Entra ID) Domain Services provides domain join but requires code changes or a separate auth flow. Option B is wrong because App Service Authentication (EasyAuth) can be configured but may require code changes for WIA. Option D is wrong because a VPN doesn't solve authentication; it just secures network 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.
✓
Microsoft Entra Application Proxy
Why this is correct
Application Proxy enables legacy apps to use Entra ID authentication with minimal code changes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Microsoft Entra Domain Services
Why it's wrong here
Entra Domain Services provides domain services but doesn't directly enable authentication without code changes.
✗
App Service Authentication (EasyAuth) with Entra ID
Why it's wrong here
EasyAuth can be used but may require changes to the authentication flow for legacy WIA.
✗
Site-to-Site VPN with on-premises Active Directory
Why it's wrong here
VPN secures network but doesn't address authentication modernization.
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 — Option C is correct because Microsoft Entra ID Application Proxy allows legacy apps to use Entra ID authentication without modifying code, by publishing the app through the proxy. Option A is wrong because Azure AD (now Entra ID) Domain Services provides domain join but requires code changes or a separate auth flow. Option B is wrong because App Service Authentication (EasyAuth) can be configured but may require code changes for WIA. Option D is wrong because a VPN doesn't solve authentication; it just secures network 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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