The answer is implementing micro-segmentation of network traffic and treating identity as the primary security perimeter. These two actions are core to the Microsoft Cybersecurity Reference Architecture (MCRA) for a Zero Trust implementation because they directly enforce the "never trust, always verify" principle: micro-segmentation limits lateral movement by isolating workloads, while identity-based controls ensure every access request is authenticated and authorized regardless of network location. On the Microsoft Cybersecurity Architect exam, this tests your understanding that Zero Trust shifts trust from the network to identity, a concept often confused with traditional network segmentation. A common trap is selecting network-centric controls like VPNs or firewalls as primary actions, but the MCRA prioritizes identity and micro-segmentation as foundational. Memory tip: think "ID and SEG" — Identity is the new perimeter, and Segmentation stops the spread.
SC-100 Practice Question: Design solutions that align with security best practices and priorities
This SC-100 practice question tests your understanding of design solutions that align with security best practices and priorities. 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.
Which TWO actions are part of the Microsoft Cybersecurity Reference Architecture (MCRA) for a Zero Trust implementation?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Treat identity as the primary security perimeter
Option C is correct because the MCRA explicitly identifies identity as the primary security perimeter in a Zero Trust model, shifting trust from the network to user and device identity. This principle underpins all other controls, as every access request must be authenticated and authorized regardless of location.
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.
✗
Use a single security vendor for all solutions
Why it's wrong here
MCRA supports best-of-breed, not single vendor.
✗
Block all legacy authentication protocols
Why it's wrong here
MCRA suggests reducing, not necessarily blocking all.
✓
Treat identity as the primary security perimeter
Why this is correct
MCRA emphasizes identity as the control plane.
Related concept
Read the scenario before looking for a memorised answer.
✓
Implement micro-segmentation of network traffic
Why this is correct
Micro-segmentation is a key Zero Trust network principle.
Related concept
Read the scenario before looking for a memorised answer.
✗
Require multifactor authentication for all users
Why it's wrong here
MCRA does not mandate MFA for all; it's context-based.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'best practices' (like blocking legacy auth or requiring MFA for all) with the core architectural principles of Zero Trust defined in the MCRA, which prioritize identity as the control plane and micro-segmentation as the network isolation mechanism.
Detailed technical explanation
How to think about this question
The MCRA's identity-as-perimeter concept relies on Azure AD as the central policy decision point, using signals like device compliance (via Intune), user risk (via Identity Protection), and location to enforce access. Micro-segmentation (Option D) complements this by using network policies (e.g., Azure Virtual Network Manager, NSGs) or host-based firewalls to restrict lateral movement, ensuring that even if an identity is compromised, the blast radius is contained. In practice, this means a compromised user token cannot access resources outside their assigned micro-segment without re-authentication.
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.
TExam Day Tips
→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.
Design solutions that align with security best practices and priorities — This question tests Design solutions that align with security best practices and priorities — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Treat identity as the primary security perimeter — Option C is correct because the MCRA explicitly identifies identity as the primary security perimeter in a Zero Trust model, shifting trust from the network to user and device identity. This principle underpins all other controls, as every access request must be authenticated and authorized regardless of location.
What should I do if I get this SC-100 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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