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Operationalizing zero trust means changing how access to each protected resource is granted: network location or ownership alone cannot establish trust. Organizations translate that principle into policies and controls that evaluate users, devices, and the resource being requested, then stage the work according to risk and operational readiness. It is an architecture and operating program—not a single network product or vendor platform.
What changes in practice?
NIST describes zero trust as an evolving set of cybersecurity paradigms that shifts defenses away from static network perimeters and toward users, assets, and resources. Its central rule is that an account or device is not trusted just because it is on an enterprise network or owned by the organization. Before a session to a resource is established, the subject and device are authenticated and authorized.
“Zero trust assumes there is no implicit trust granted to assets or user accounts based solely on their physical or network location (i.e., local area networks versus the internet) or based on asset ownership (enterprise or personally owned).”
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That principle, set out in NIST Special Publication 800-207 in August 2020, responds to work patterns and architectures that cross traditional boundaries: remote users, bring-your-own-device use, and cloud assets outside an enterprise-owned network. It does not mean network controls disappear. It means being inside a network is not, by itself, sufficient reason to grant access.
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How do you operationalize zero trust?
Turn the architecture principle into a sequence of decisions about what to protect, what context to consider, where policy will be enforced, and how the organization will operate and assess the resulting controls.
- Choose a resource and define the risk. Identify the application, data, workflow, or other resource in scope, who or what needs access, and the risk the organization is trying to manage. Use the organization’s risk-management process to inform priorities rather than beginning with a product category.
- Map identities, devices, and data flows. Document the human and service identities involved, the endpoints they use, the data flows that support the resource, and relevant on-premises and cloud dependencies. These are among the areas addressed in NIST’s planning guide.
- Specify the access decision. Define how the subject and device are authenticated and authorized before access to the resource is established. Make clear which conditions allow or deny access and which resource the decision applies to.
- Select enforcement and integration points. Determine where controls can enforce that decision and how they will work with existing identity, endpoint, network, and security operations capabilities. Account for the resource’s location and dependencies, including cloud and on-premises environments.
- Implement, operate, and reassess. Put the chosen controls into operation, assign responsibility for their ongoing administration, and review whether they still address the documented risk as users, devices, resources, and data flows change.
This is a planning sequence, not a prescribed NIST configuration. The right implementation depends on the resource, existing environment, and risk priorities.
Start with protected resources and risk
Zero trust is resource-focused, so begin by identifying what the organization needs to protect—not by assuming that deploying a particular access service, appliance, or network design will establish a zero-trust architecture. Define the resource boundary clearly enough to identify its users, devices, dependencies, and data flows.
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Bring the right stakeholders into scope
For each resource, involve the people responsible for its business use and operation as well as the teams that manage relevant identities, endpoints, data flows, and security controls. Their input helps surface legitimate access needs, dependencies, and migration constraints before policy or enforcement changes affect normal work.
Make identity and device context part of access
For every in-scope resource, establish how the organization will authenticate and authorize both the requesting subject and device before a resource session is established. A user identity alone is not the complete access decision, and network location alone cannot substitute for either check.
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Translate that rule into concrete policy for the identities and devices involved. The precise policy and enforcement design will vary with the resource and its environment; NIST’s architecture principle does not prescribe one universal product configuration.
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Use implementation examples as patterns, not blueprints
NIST Special Publication 1800-35, published June 10, 2025, documents 19 example zero-trust architecture implementations built by the National Cybersecurity Center of Excellence in collaboration with 24 organizations under cooperative research and development agreements. The guide provides technical details for the examples, summarizes practices and lessons learned, and maps principles and technologies to common standards and guidelines.
The implementations integrate commercially available technology to demonstrate common use cases. NIST identifies capability areas including enhanced identity governance, identity, credential and access management, microsegmentation, secure access service edge, and software-defined perimeter. These are capability areas and implementation options—not interchangeable proof that an organization has achieved zero trust. The examples can help teams understand possible designs and adapt relevant patterns, but they are not a one-size-fits-all blueprint or independent validation that a particular vendor or architecture is universally best.
NIST states that identifying commercial materials does not imply recommendation or endorsement. A company’s participation in the project establishes its participation in that project; it does not establish that a product is suitable for a specific organization or is currently available on appropriate terms.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Compare implementation options against the resource and its risks
Evaluate proposed architectures and products by how they address the protected resource and the operating environment—not by whether they use a “zero trust” label. NIST’s resource-focused principles and implementation examples support comparing approaches on these practical dimensions:
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| Evaluation dimension | Questions to ask |
|---|---|
| Resources and workflows | Which applications, data, workflows, and other resources will be protected? Are the users and dependencies in scope understood? |
| Identity and device context | How are user, service, and device identities represented, authenticated, and authorized for the requested resource? |
| Enforcement | Where is access policy enforced, and does enforcement occur before a session to the resource is established? |
| Environment coverage | How does the design support the relevant on-premises and cloud resources and their data flows? |
| Integration and operations | How does it fit existing identity governance, endpoint, network, and security operations capabilities? What migration and ongoing operational work will it require? |
| Risk alignment | Which documented risk priorities does the implementation address, and how will the organization reassess that alignment as the environment changes? |
These questions provide a basis for a defensible comparison without declaring a universal winner. A design that fits one resource, organization, or risk profile may not fit another.
Stage and assess progress with a roadmap
CISA’s Zero Trust Maturity Model Version 2 is a federal roadmap and resource intended to support agency strategies and implementation plans. At a high level, it is organized around five pillars and three cross-cutting capabilities. Consult the model itself for the complete matrix and its specific maturity guidance; the top-level structure alone is not a substitute for that detail.
Organizations can use a maturity roadmap to stage work and assess progress, while keeping the resource and risk priorities visible. Set a baseline for the controls relevant to a selected resource, identify the next practical improvement, and assign ownership for implementation and ongoing operation. Revisit the assessment as the scope, dependencies, and risks change. A roadmap helps organize the work; it does not make every federal-specific requirement applicable to a private organization.
What to measure—and what not to claim
Assess implementation progress against the controls and resources actually in scope. Useful program checks include whether access decisions account for subject and device identity before the resource session, whether relevant data flows and dependencies have been addressed, and whether responsibility for operating the controls is clear. Tie assessment to the organization’s risk-management process and use a maturity model where it helps structure staged work.
Do not treat the number of deployed products, adoption of a named architecture category, or a vendor’s participation in an example build as proof of security outcomes. The cited NIST material describes architecture principles and implementation examples; it does not establish a general breach-reduction or return-on-investment figure for zero trust.
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