The answer is to configure Microsoft Entra hybrid join and enable Seamless SSO. This solution is correct because hybrid join registers your existing domain-joined devices with Entra ID, while Seamless SSO automatically authenticates users against on-premises Active Directory when they access line-of-business applications using Windows Integrated Authentication, eliminating credential prompts. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of how to bridge on-premises and cloud identity for legacy apps without breaking existing authentication flows. A common trap is choosing Azure AD Application Proxy, which handles remote access but not silent authentication for on-prem apps, or Pass-through Authentication, which is designed for cloud app sign-ins. Remember the key pairing: hybrid join handles the device, Seamless SSO handles the ticket—think of it as “join the device, seal the ticket” for zero-prompt access.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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 company is migrating its on-premises Active Directory to Microsoft Entra ID. They have line-of-business applications that use Windows Integrated Authentication. You need to design a solution that allows users to access these applications from domain-joined devices without prompting for credentials, while also supporting hybrid identity. What should you implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure Microsoft Entra hybrid join and enable Seamless SSO.
Option D is correct because Microsoft Entra hybrid join allows domain-joined devices to authenticate to both on-prem and cloud resources, enabling SSO. Option A is incorrect because Azure AD Application Proxy requires separate authentication. Option B is incorrect because Pass-through Authentication is for cloud apps, not on-prem. Option C is incorrect because Federation does not provide device-based SSO for on-prem apps.
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.
✗
Deploy Pass-through Authentication (PTA) with Seamless SSO.
Why it's wrong here
PTA is for cloud apps, not on-prem.
✓
Configure Microsoft Entra hybrid join and enable Seamless SSO.
Why this is correct
Hybrid join provides SSO for on-prem apps from domain-joined devices.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Azure AD Application Proxy with pre-authentication.
Why it's wrong here
App Proxy requires user to authenticate again.
✗
Implement Active Directory Federation Services (AD FS).
Why it's wrong here
Federation adds complexity; does not enable device-based SSO for on-prem.
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: Configure Microsoft Entra hybrid join and enable Seamless SSO. — Option D is correct because Microsoft Entra hybrid join allows domain-joined devices to authenticate to both on-prem and cloud resources, enabling SSO. Option A is incorrect because Azure AD Application Proxy requires separate authentication. Option B is incorrect because Pass-through Authentication is for cloud apps, not on-prem. Option C is incorrect because Federation does not provide device-based SSO for on-prem apps.
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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