- A
Configure Microsoft Entra Application Proxy
Why wrong: Entra Application Proxy is for publishing on-premises web applications, not for general Kerberos authentication.
- B
Implement Microsoft Entra Kerberos authentication
Entra Kerberos authentication allows users to authenticate to on-premises resources using their Entra ID identity, supporting passwordless methods and reducing latency.
- C
Enable Microsoft Entra Conditional Access policies
Why wrong: Conditional Access policies enforce access controls but do not provide authentication to on-premises resources.
- D
Deploy Microsoft Entra Connect Sync with password hash synchronization
Why wrong: Password hash sync enables authentication in the cloud but does not support Kerberos authentication to on-premises resources without VPN.
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.
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?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
Implement Microsoft Entra Kerberos authentication
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.
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.
- ✗
Configure Microsoft Entra Application Proxy
Why it's wrong here
Entra Application Proxy is for publishing on-premises web applications, not for general Kerberos authentication.
- ✓
Implement Microsoft Entra Kerberos authentication
Why this is correct
Entra Kerberos authentication allows users to authenticate to on-premises resources using their Entra ID identity, supporting passwordless methods and reducing latency.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable Microsoft Entra Conditional Access policies
Why it's wrong here
Conditional Access policies enforce access controls but do not provide authentication to on-premises resources.
- ✗
Deploy Microsoft Entra Connect Sync with password hash synchronization
Why it's wrong here
Password hash sync enables authentication in the cloud but does not support Kerberos authentication to on-premises resources without VPN.
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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Design security solutions for infrastructure — study guide chapter
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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: Implement Microsoft Entra Kerberos authentication — 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.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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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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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