- A
Deploy domain controllers as Azure VMs in the same virtual network as the application VMs. Configure the application VMs to use these domain controllers for authentication and KCD.
This provides low-latency access to domain controllers and supports KCD without exposing on-premises DCs.
- B
Implement Azure AD Application Proxy to publish the applications and use Azure AD for authentication.
Why wrong: Application Proxy is for reverse proxy, not for KCD delegation.
- C
Use Azure AD Domain Services to provide domain join and KCD capabilities for the Azure VMs.
Why wrong: Azure AD DS does not support full KCD required by many LOB apps.
- D
Configure the application VMs to use the on-premises domain controllers over ExpressRoute for authentication and KCD.
Why wrong: This increases latency and relies on WAN connectivity.
Quick Answer
The answer is to deploy domain controllers as Azure VMs in the same virtual network as the application VMs. This solution is correct because it enables Kerberos constrained delegation (KCD) for Azure VMs accessing on-premises resources while keeping authentication traffic local to Azure, avoiding any exposure of on-premises domain controllers to the internet. By placing the domain controllers in the same virtual network, you minimize latency for Kerberos ticket exchanges and leverage Azure ExpressRoute for secure, high-speed connectivity back to on-premises resources. On the Microsoft Cybersecurity Architect exam, this scenario tests your understanding of hybrid identity delegation patterns and the limitations of alternatives like Azure AD Domain Services, which lacks full KCD support, or relying solely on ExpressRoute, which introduces WAN latency. A common trap is assuming Azure AD Application Proxy can handle Kerberos delegation, but it is designed for app publishing, not authentication flow. Memory tip: think “local DCs for local delegation” — keep the Kerberos key distribution center close to the VMs.
SC-100 Design security solutions for infrastructure Practice Question
This SC-100 practice question tests your understanding of design security solutions for infrastructure. 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.
You are the security architect for a company that has a hybrid identity infrastructure with Microsoft Entra ID (formerly Azure AD) and an on-premises Active Directory Domain Services (AD DS) forest. The company is planning to migrate several line-of-business (LOB) applications to Azure Virtual Machines. The applications currently use Windows Integrated Authentication (WIA) and rely on Kerberos delegation. You need to design a solution that allows the Azure VMs to authenticate on-premises users and access on-premises resources using Kerberos constrained delegation (KCD) without exposing on-premises-domain controllers to the internet. The solution must minimize latency and administrative overhead. You have configured Azure ExpressRoute for connectivity between the on-premises network and Azure. What should you do?
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
Deploy domain controllers as Azure VMs in the same virtual network as the application VMs. Configure the application VMs to use these domain controllers for authentication and KCD.
Option A is correct because deploying domain controllers as Azure VMs in the same virtual network as the application VMs allows them to use KCD with low latency, and ExpressRoute ensures secure connectivity without exposing on-premises DCs. Option B is wrong because Azure AD Domain Services provides managed domain services but does not support full KCD and may not meet all application requirements. Option C is wrong because using only ExpressRoute means the VMs would have to communicate with on-premises DCs over the WAN, potentially increasing latency. Option D is wrong because Azure AD Application Proxy is for publishing on-premises apps, not for authentication delegation.
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 domain controllers as Azure VMs in the same virtual network as the application VMs. Configure the application VMs to use these domain controllers for authentication and KCD.
Why this is correct
This provides low-latency access to domain controllers and supports KCD without exposing on-premises DCs.
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.
- ✗
Implement Azure AD Application Proxy to publish the applications and use Azure AD for authentication.
Why it's wrong here
Application Proxy is for reverse proxy, not for KCD delegation.
- ✗
Use Azure AD Domain Services to provide domain join and KCD capabilities for the Azure VMs.
Why it's wrong here
Azure AD DS does not support full KCD required by many LOB apps.
- ✗
Configure the application VMs to use the on-premises domain controllers over ExpressRoute for authentication and KCD.
Why it's wrong here
This increases latency and relies on WAN connectivity.
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: Deploy domain controllers as Azure VMs in the same virtual network as the application VMs. Configure the application VMs to use these domain controllers for authentication and KCD. — Option A is correct because deploying domain controllers as Azure VMs in the same virtual network as the application VMs allows them to use KCD with low latency, and ExpressRoute ensures secure connectivity without exposing on-premises DCs. Option B is wrong because Azure AD Domain Services provides managed domain services but does not support full KCD and may not meet all application requirements. Option C is wrong because using only ExpressRoute means the VMs would have to communicate with on-premises DCs over the WAN, potentially increasing latency. Option D is wrong because Azure AD Application Proxy is for publishing on-premises apps, not for authentication delegation.
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.
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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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