hardMultiple SelectObjective-mapped
Key Zero Trust Principles Using Microsoft 365 Defender
A company is implementing a Zero Trust security model using Microsoft 365 Defender. Which THREE of the following are key principles they should follow?
Quick Answer
The answer is verifying explicitly based on all available data points, such as user identity, device health, and location. This is correct because Zero Trust eliminates implicit trust and requires continuous validation of every access request; Microsoft 365 Defender operationalizes this by aggregating signals across endpoints, identities, and cloud apps to enforce conditional access decisions in real time. On the Microsoft Cybersecurity Architect exam, this principle tests your understanding of how Defender’s correlation engine feeds into Azure AD Conditional Access policies, with a common trap being to confuse “verify explicitly” with simple multi-factor authentication—remember that explicit verification must consider dynamic risk signals, not just a static password. A memory tip: think of the acronym “V.E.D.”—Verify Explicitly using all Data points—to distinguish this from the other two core Zero Trust pillars of least privilege and assume breach.
⚠ Common exam trap
Watch out — candidates often confuse Zero Trust with traditional perimeter-based security, mistakenly believing that internal network origin or known user status should be trusted implicitly, when in fact Zero Trust requires explicit verification for every access request regardless of source.
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 least privilege access by limiting user permissions with Just-In-Time and Just-Enough-Access.
Zero Trust mandates least privilege access, and Microsoft 365 Defender integrates with Azure AD Privileged Identity Management (PIM) to enforce Just-In-Time (JIT) and Just-Enough-Access (JEA) policies. This ensures users receive only the permissions necessary for a specific task, for a limited duration, reducing the risk of lateral movement and privilege escalation.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Trust all traffic originating from within the corporate network.
Why it's wrong here
Zero Trust assumes no implicit trust, even inside the network.
- ✓
Use least privilege access by limiting user permissions with Just-In-Time and Just-Enough-Access.
Why this is correct
Minimizes the blast radius of a breach.
- ✗
Provide implicit trust to known users and devices.
Why it's wrong here
Zero Trust requires continuous verification, not implicit trust.
- ✓
Assume breach and segment access to minimize blast radius.
Why this is correct
Design for breach containment.
- ✓
Verify explicitly based on all available data points (user, device, location, etc.).
Why this is correct
Zero Trust requires explicit verification for each access request.
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Same concept, more angles
1 more way 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. A multinational company is implementing a Zero Trust security model. The security team needs to ensure that all access requests to critical applications are evaluated based on user identity, device health, and real-time risk signals. Which Microsoft solution should they use to centralize policy enforcement?
medium- A.Microsoft Defender for Cloud Apps
- ✓ B.Microsoft Entra Conditional Access
- C.Azure AD Identity Protection
- D.Microsoft Purview Compliance Manager
Why B: Correct answer is B: Microsoft Entra Conditional Access. It evaluates user identity, device health, and real-time risk signals to enforce access policies. Option A (Microsoft Defender for Cloud Apps) is a CASB for app access control, not a direct authentication policy engine. Option C (Azure AD Identity Protection) identifies risks but does not enforce policies directly. Option D (Microsoft Purview Compliance Manager) is for compliance assessments, not real-time policy enforcement.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.