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CISSP Practice Question: In a zero trust architecture, which component is…
In a zero trust architecture, which component is responsible for continuously verifying the trustworthiness of a device before granting access to resources?
⚠ Common exam trap
Many exam-takers confuse the Policy Decision Point (PDP) with the Policy Enforcement Point (PEP), mistakenly thinking the PEP makes the trust decision when it only enforces the decision made by the PDP.
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
✓
Policy Decision Point (PDP)
In a zero trust architecture, the Policy Decision Point (PDP) is the component that evaluates all available telemetry and contextual data—such as device posture, user identity, and behavioral analytics—to make a real-time trust decision. It continuously verifies device trustworthiness by applying dynamic policies (e.g., checking for up-to-date patches, compliance with security baselines, or absence of malware) before granting or denying access to resources. This aligns with the NIST SP 800-207 zero trust model, where the PDP is the logical brain that computes trust levels and issues authorization decisions.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Policy Decision Point (PDP)
Why this is correct
The Policy Decision Point (PDP) is the core intelligence component within a Zero Trust Architecture responsible for evaluating all relevant contextual information, including user identity, device posture, resource sensitivity, and environmental factors, against established security policies. It continuously assesses the trust level of a subject attempting to access a resource, making the ultimate authorization decision to grant, deny, or revoke access. This real-time, context-aware evaluation is central to the "never trust, always verify" principle.
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Policy Enforcement Point (PEP)
Why it's wrong here
The Policy Enforcement Point (PEP) acts as the gatekeeper, implementing the access decisions made by the Policy Decision Point (PDP). Its primary function is to enforce the permitted or denied access to a resource by intercepting requests and allowing or blocking traffic based on the PDP's directive. The PEP does not evaluate policies or determine trust itself; instead, it translates the PDP's authorization decision into concrete actions, such as establishing a connection or terminating a session.
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Identity Provider (IdP)
Why it's wrong here
An Identity Provider (IdP) is primarily responsible for authenticating users and providing assertions about their identity to other services. While crucial for verifying "who" is requesting access, the IdP typically focuses on user credentials and attributes, not the real-time device posture, network location, or other dynamic trust factors essential for a comprehensive Zero Trust decision. It supplies identity information that the PDP then uses as one input among many for its broader trust evaluation.
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Policy Administrator (PA)
Why it's wrong here
The Policy Administrator (PA) is responsible for defining, configuring, and managing the security policies that govern access within the Zero Trust environment. This component sets the rules and parameters that the Policy Decision Point (PDP) will later evaluate against incoming access requests. However, the PA itself does not actively participate in the real-time evaluation of trust or the enforcement of access decisions; its role is purely administrative in establishing the policy framework.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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