The answer is "assume breach and verify explicitly." This is the primary principle of Zero Trust because it operationalizes the core tenet of "never trust, always verify," meaning every access request—whether from inside or outside the network—must be authenticated, authorized, and encrypted before granting access. It eliminates the implicit trust traditionally granted based on network location, enforcing least-privilege access as a foundational requirement. On the Microsoft Cybersecurity Architect exam, this principle tests your understanding that Zero Trust is not about a single technology but a mindset shift; a common trap is selecting "verify every user" alone, which misses the critical assumption that a breach has already occurred. Remember the memory tip: "Assume breach, then verify—never trust the network floor."
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.
A company plans to implement a Zero Trust security model. Which of the following is the primary principle that should guide their strategy?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Assume breach and verify explicitly
The primary principle of Zero Trust is 'never trust, always verify,' which is operationalized as 'assume breach and verify explicitly.' This means every access request—regardless of source (internal or external)—must be authenticated, authorized, and encrypted before granting access. It eliminates implicit trust based on network location and enforces least-privilege access, which is foundational to the Zero Trust architecture.
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.
✓
Assume breach and verify explicitly
Why this is correct
This is a foundational Zero Trust principle.
Clue confirmation
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a strong perimeter firewall as the primary defense
Why it's wrong here
Zero Trust shifts from perimeter-based security to identity-based security.
✗
Grant trusted users full access to all resources
Why it's wrong here
Zero Trust requires least privilege and continuous verification.
✗
Trust but verify all internal traffic
Why it's wrong here
Zero Trust assumes no implicit trust, even inside the network.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'trust but verify' (Option D) with Zero Trust, but Zero Trust explicitly rejects any pre-established trust and requires verification at every access attempt, making 'assume breach and verify explicitly' the correct guiding principle.
Detailed technical explanation
How to think about this question
Under the hood, Zero Trust enforces this principle using technologies like Azure AD Conditional Access, which evaluates signals (user risk, device compliance, location) in real time before issuing a token, and micro-segmentation via Azure Network Security Groups (NSGs) or Azure Firewall to restrict east-west traffic. In a real-world scenario, even a domain admin must re-authenticate and satisfy policy checks to access a sensitive SQL database, and if the device is non-compliant, access is blocked despite the user's high privilege level.
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: Assume breach and verify explicitly — The primary principle of Zero Trust is 'never trust, always verify,' which is operationalized as 'assume breach and verify explicitly.' This means every access request—regardless of source (internal or external)—must be authenticated, authorized, and encrypted before granting access. It eliminates implicit trust based on network location and enforces least-privilege access, which is foundational to the Zero Trust architecture.
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.
Are there clue words in this question I should notice?
Yes — watch for: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
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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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 company is implementing a Zero Trust security model. Which principle requires verifying every access request as if it originates from an uncontrolled network?
easy
A.Least privilege
B.Micro-segmentation
C.Assume breach
✓ D.Verify explicitly
Why D: The 'Assume breach' principle is not about verifying requests. 'Verify explicitly' is the Zero Trust principle that mandates authenticating and authorizing every access request. 'Least privilege' limits access rights. 'Micro-segmentation' is a network isolation technique.
Last reviewed: Jun 24, 2026
Question Discussion
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