- A
Join the on-premises servers to Microsoft Entra Domain Services and use passwordless authentication.
Why wrong: Entra Domain Services is for IaaS VMs needing domain join, not for publishing on-prem apps to users.
- B
Use Microsoft Entra application proxy to publish the on-premises applications and enable passwordless authentication.
Entra application proxy publishes on-prem apps with SSO and passwordless support, minimizing latency by proxying through Entra ID.
- C
Install Web Application Proxy (WAP) on-premises and integrate with Microsoft Entra ID for passwordless.
Why wrong: WAP is a legacy on-premises component; modern approach uses Entra application proxy for cloud-native passwordless.
- D
Deploy a VPN and use Microsoft Entra ID with passwordless sign-in.
Why wrong: VPN adds latency and complexity; passwordless sign-in works with Entra ID directly but VPN is not required for on-prem app access.
Quick Answer
The answer is to use Microsoft Entra application proxy to publish the on-premises apps and enable passwordless authentication. This solution is correct because Entra application proxy acts as a reverse proxy, securely routing user requests from the cloud to on-premises web applications without requiring a VPN, and it fully integrates with Microsoft Entra ID’s passwordless authentication methods—such as FIDO2 security keys or Windows Hello for Business—so users never need to enter a password. On the Microsoft Cybersecurity Architect exam, this question tests your ability to design a hybrid identity infrastructure that balances security with low latency; the common trap is choosing VPN, which adds network overhead and doesn’t natively support passwordless flows, or confusing Web Application Proxy (a legacy on-premises component) with the cloud-native Entra application proxy. Remember the memory tip: “Proxy for passwordless, VPN for stress”—the proxy eliminates both passwords and latency.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 hybrid identity infrastructure with Microsoft Entra ID. You need to ensure that users can access on-premises applications using passwordless authentication and that the solution minimizes latency for authentication requests. What should you implement?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use Microsoft Entra application proxy to publish the on-premises applications and enable passwordless authentication.
Option C is correct because Microsoft Entra application proxy provides secure remote access to on-premises web applications without requiring a VPN, and it can leverage passwordless authentication through Microsoft Entra ID. Option A is wrong because VPN introduces latency and does not inherently support passwordless. Option B is wrong because Microsoft Entra Domain Services is for domain-joined VMs, not for publishing apps. Option D is wrong because Web Application Proxy is a legacy on-premises component that does not integrate with passwordless.
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.
- ✗
Join the on-premises servers to Microsoft Entra Domain Services and use passwordless authentication.
Why it's wrong here
Entra Domain Services is for IaaS VMs needing domain join, not for publishing on-prem apps to users.
- ✓
Use Microsoft Entra application proxy to publish the on-premises applications and enable passwordless authentication.
Why this is correct
Entra application proxy publishes on-prem apps with SSO and passwordless support, minimizing latency by proxying through Entra ID.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Install Web Application Proxy (WAP) on-premises and integrate with Microsoft Entra ID for passwordless.
Why it's wrong here
WAP is a legacy on-premises component; modern approach uses Entra application proxy for cloud-native passwordless.
- ✗
Deploy a VPN and use Microsoft Entra ID with passwordless sign-in.
Why it's wrong here
VPN adds latency and complexity; passwordless sign-in works with Entra ID directly but VPN is not required for on-prem app access.
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.
What to study next
Got this wrong? Here's your next step.
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.
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FAQ
Questions learners often ask
What does this SC-100 question test?
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: Use Microsoft Entra application proxy to publish the on-premises applications and enable passwordless authentication. — Option C is correct because Microsoft Entra application proxy provides secure remote access to on-premises web applications without requiring a VPN, and it can leverage passwordless authentication through Microsoft Entra ID. Option A is wrong because VPN introduces latency and does not inherently support passwordless. Option B is wrong because Microsoft Entra Domain Services is for domain-joined VMs, not for publishing apps. Option D is wrong because Web Application Proxy is a legacy on-premises component that does not integrate with passwordless.
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.
About these practice questions
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Same concept, more angles
1 more ways this is tested on SC-100
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You are designing a hybrid identity solution for an organization that uses Microsoft Entra ID and an on-premises Active Directory. The organization requires that users who are located in a remote office without a direct VPN connection to the main office can authenticate against on-premises resources using their Entra ID credentials. The solution must minimize latency and support passwordless authentication. Which feature should you implement?
medium- A.Configure Microsoft Entra Application Proxy
- ✓ B.Implement Microsoft Entra Kerberos authentication
- C.Enable Microsoft Entra Conditional Access policies
- D.Deploy Microsoft Entra Connect Sync with password hash synchronization
Why B: Option C is correct because Microsoft Entra Kerberos authentication enables users to access on-premises resources using their Entra ID credentials without requiring a VPN, and it supports passwordless methods like FIDO2 and Windows Hello for Business. Option A is wrong because Entra ID Application Proxy is for publishing on-premises web apps, not general authentication. Option B is wrong because Entra Connect Sync synchronizes identities but does not provide real-time authentication without VPN. Option D is wrong because Entra ID Conditional Access policies control access but do not enable passwordless authentication.
Last reviewed: Jun 21, 2026
This SC-100 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SC-100 exam.
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