Quick Answer
The answer is to verify explicitly every access request. This principle is the foundation of zero trust network traffic because it mandates that no entity—whether inside or outside the corporate network—is trusted by default; every request must be fully authenticated, authorized, and encrypted before access is granted. On the Microsoft Cybersecurity Architect exam, this concept tests your understanding of how zero trust shifts security from location-based trust to identity and policy-driven verification, often appearing in scenario-based questions where a legacy VPN or VLAN is being replaced. A common trap is assuming that internal network traffic can bypass verification, but the core shift is eliminating implicit trust entirely. Remember the mnemonic “V.E.A.”—Verify Explicitly Always—to recall that every packet, regardless of origin, must prove its legitimacy before being allowed through.
This SC-100 practice question tests your understanding of recommend 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 is moving to a zero-trust security model. Which principle is most important for securing network traffic?
Rely on perimeter firewalls to block threats
Why wrong: Perimeter defenses are insufficient in zero-trust.
Verify explicitly every access request
Zero-trust requires explicit verification for each access attempt.
Trust all traffic within the corporate network
Why wrong: Zero-trust does not trust any traffic by default.
Allow all traffic and monitor for anomalies
Why wrong: Allow-all is not zero-trust; it increases risk.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Verify explicitly every access request
In a zero-trust model, the principle of 'verify explicitly' means every access request—regardless of source—must be authenticated, authorized, and encrypted before being allowed. This eliminates implicit trust based on network location, which is the core shift from traditional perimeter-based security.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Rely on perimeter firewalls to block threats
Why it's wrong here
Perimeter defenses are insufficient in zero-trust.
Verify explicitly every access request
Why this is correct
Zero-trust requires explicit verification for each access attempt.
Related concept
Read the scenario before looking for a memorised answer.
Trust all traffic within the corporate network
Why it's wrong here
Zero-trust does not trust any traffic by default.
Allow all traffic and monitor for anomalies
Why it's wrong here
Allow-all is not zero-trust; it increases risk.
Common exam traps
The trap here is that candidates often confuse zero-trust with traditional defense-in-depth, mistakenly thinking perimeter firewalls or anomaly detection are sufficient, when the exam specifically tests the 'verify explicitly' principle as the foundational requirement for zero-trust network traffic.
Detailed technical explanation
Zero-trust network access (ZTNA) enforces micro-segmentation and per-request authentication using technologies like TLS mutual authentication (mTLS) and identity-aware proxies. For example, Google's BeyondCorp model uses device certificates and user credentials to verify every request before granting access to a specific resource, regardless of whether the user is on the corporate LAN or a coffee shop Wi-Fi.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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FAQ
Recommend security best practices and priorities — This question tests Recommend security best practices and priorities — Read the scenario before looking for a memorised answer..
The correct answer is: Verify explicitly every access request — In a zero-trust model, the principle of 'verify explicitly' means every access request—regardless of source—must be authenticated, authorized, and encrypted before being allowed. This eliminates implicit trust based on network location, which is the core shift from traditional perimeter-based security.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 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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