The answer is the identity of the user and device. This is correct because Zero Trust flips the old model on its head: instead of trusting anything inside a network firewall, it assumes breach and treats every access request as a potential threat, making identity—not network location—the new security perimeter. On the SC-900 exam, this concept tests your understanding that Zero Trust shifts the control plane from IP addresses to who and what is requesting access, with a common trap being to select “network segmentation” or “VPN” as the primary perimeter. A solid memory tip is to think of “ID as the new firewall”—if you can’t verify the user and device, no network location earns trust.
SC-900 Practice Question: Describe the concepts of security, compliance, and identity
This SC-900 practice question tests your understanding of describe the concepts of security, compliance, and identity. 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 security architect is explaining the Zero Trust model to the board. The architect emphasizes that the network perimeter can no longer be considered a safe zone. Which statement best describes the modern primary security perimeter according to Zero Trust principles?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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.
Why wrong: Zero Trust explicitly moves away from relying on network perimeters like firewalls and VPNs as the sole security boundary.
B
The identity of the user and device
Identity is the fundamental building block of Zero Trust; it is used to verify every access request and enforce least privilege, forming the new perimeter.
C
The physical on-premises data center
Why wrong: Zero Trust applies equally to on-premises and cloud resources; physical location is not a trust factor.
D
The endpoint antivirus and anti-malware solution
Why wrong: While endpoint protection is important, it is just one component. The primary perimeter is identity, not a specific security tool.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The identity of the user and device
In the Zero Trust model, the primary security perimeter is the identity of the user and device, not the network location. This is because Zero Trust assumes breach and requires explicit verification for every access request, regardless of whether it originates from inside or outside the corporate network. By treating identity as the new control plane, organizations enforce least-privilege access and continuous authentication, making the user and device identity the critical trust boundary.
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.
✗
The corporate network firewall and VPN
Why it's wrong here
Zero Trust explicitly moves away from relying on network perimeters like firewalls and VPNs as the sole security boundary.
✓
The identity of the user and device
Why this is correct
Identity is the fundamental building block of Zero Trust; it is used to verify every access request and enforce least privilege, forming the new perimeter.
Clue confirmation
The clue words "best", "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The physical on-premises data center
Why it's wrong here
Zero Trust applies equally to on-premises and cloud resources; physical location is not a trust factor.
✗
The endpoint antivirus and anti-malware solution
Why it's wrong here
While endpoint protection is important, it is just one component. The primary perimeter is identity, not a specific security tool.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the Zero Trust model with traditional defense-in-depth layers, mistakenly selecting the corporate firewall or VPN as the primary perimeter, when in fact Zero Trust shifts the trust boundary to the identity of the user and device.
Detailed technical explanation
How to think about this question
Zero Trust relies on technologies such as Azure Active Directory (now Microsoft Entra ID) for identity verification, Conditional Access policies for real-time risk assessment, and device compliance checks via Microsoft Intune. Under the hood, every access request is evaluated against policies that consider user identity, device state, location, and session risk before granting a token or session. A real-world scenario is a user accessing a sensitive app from an unmanaged personal device: even if the user's password is correct, Zero Trust blocks access because the device identity is not compliant, demonstrating that identity (user + device) is the perimeter.
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-900 question in full detail.
Describe the concepts of security, compliance, and identity — This question tests Describe the concepts of security, compliance, and identity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The identity of the user and device — In the Zero Trust model, the primary security perimeter is the identity of the user and device, not the network location. This is because Zero Trust assumes breach and requires explicit verification for every access request, regardless of whether it originates from inside or outside the corporate network. By treating identity as the new control plane, organizations enforce least-privilege access and continuous authentication, making the user and device identity the critical trust boundary.
What should I do if I get this SC-900 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: "best", "primary". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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 security architect is designing a defense strategy for the organization's network. The architect assumes that an attacker may already have breached the perimeter and is operating inside the network. Therefore, the design does not automatically trust any user or device, even if they are inside the corporate network, and requires continuous verification for every access request. Which security principle does this approach best represent?
easy
A.Defense in depth
✓ B.Zero Trust
C.Shared responsibility
D.Least privilege
Why B: The Zero Trust security principle is based on the assumption that an attacker may already be inside the network, so no user or device is automatically trusted, regardless of location. This model requires continuous verification for every access request, enforcing strict identity verification and least-privilege access controls at each step. The scenario directly describes the core tenet of Zero Trust: 'never trust, always verify.'
Last reviewed: Jun 11, 2026
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