Quick Answer
The answer is "Assume breach." This principle is a foundational pillar of zero trust security because it operates on the premise that a network is already compromised, eliminating implicit trust based on location or ownership. Instead of relying on perimeter defenses, every access request—whether from inside or outside the network—must be continuously authenticated, authorized, and encrypted, limiting the blast radius of any potential attack. On the Cisco CyberOps Associate 200-201 exam, this concept tests your understanding of how zero trust shifts from a "trust but verify" model to a "never trust, always verify" mindset. A common trap is confusing "assume breach" with simple network segmentation; remember, it demands constant verification of every transaction, not just blocking external threats. Memory tip: Think "Trust no one, verify everything"—if you assume the network is already breached, you never relax security controls.
This 200-201 practice question tests your understanding of security concepts. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 THREE of the following are key principles of zero trust security? (Choose three.)
Least privilege
Least privilege limits access to only what is necessary.
Perimeter-based security
Why wrong: Zero trust rejects the idea of a trusted internal network perimeter.
Never trust, always verify
This is a core zero trust principle.
Assume breach
Zero trust assumes a breach is inevitable or has occurred.
Implicit trust
Why wrong: Zero trust removes implicit trust, requiring verification at every step.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Least privilege
Least privilege is a core principle of zero trust because it ensures users, devices, and applications are granted only the minimum permissions necessary to perform their functions. This limits the blast radius of a potential compromise by restricting lateral movement and access to sensitive resources. In zero trust, least privilege is enforced through granular policies, often using micro-segmentation and identity-based access controls, rather than relying on network location.
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.
Least privilege
Why this is correct
Least privilege limits access to only what is necessary.
Related concept
Read the scenario before looking for a memorised answer.
Perimeter-based security
Why it's wrong here
Zero trust rejects the idea of a trusted internal network perimeter.
Never trust, always verify
Why this is correct
This is a core zero trust principle.
Related concept
Read the scenario before looking for a memorised answer.
Assume breach
Why this is correct
Zero trust assumes a breach is inevitable or has occurred.
Related concept
Read the scenario before looking for a memorised answer.
Implicit trust
Why it's wrong here
Zero trust removes implicit trust, requiring verification at every step.
Common exam traps
Cisco often tests whether candidates confuse zero trust with traditional perimeter defense, so the trap here is that 'perimeter-based security' sounds like a valid security principle but is actually the outdated model that zero trust aims to replace.
Detailed technical explanation
Under the hood, zero trust architectures enforce policy decisions based on identity, device health, and context for every session, often using technologies like Software-Defined Perimeter (SDP) or Identity-Aware Proxy (IAP). For example, Google's BeyondCorp implementation uses device inventory and user credentials to grant access to applications without a VPN, treating every request as if it comes from an untrusted network. The 'assume breach' principle drives continuous monitoring and logging, such as using NetFlow or Syslog to detect anomalous behavior even after initial access is granted.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
What to study next
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FAQ
Security Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: Least privilege — Least privilege is a core principle of zero trust because it ensures users, devices, and applications are granted only the minimum permissions necessary to perform their functions. This limits the blast radius of a potential compromise by restricting lateral movement and access to sensitive resources. In zero trust, least privilege is enforced through granular policies, often using micro-segmentation and identity-based access controls, rather than relying on network location.
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 25, 2026
This 200-201 practice question is part of Courseiva's free Cisco 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 200-201 exam.
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