Network and security teams need a shared operating model so segmentation decisions align with security policy, not just infrastructure convenience. When those groups work separately, trust boundaries are harder to define and enforce. A unified approach helps teams use the network as a practical control point for access restrictions, segmentation, and containment.
How Network and Security Teams Make Zero Trust Enforceable
Zero Trust becomes enforceable when network and security teams treat policy, segmentation, and control points as a shared operating model instead of separate handoffs. The network team owns the places where enforcement happens, while security defines what should be allowed, denied, or contained. That shared design turns Zero Trust from a principle into an operational control.
In practice, the work starts with agreeing on trust boundaries, protected assets, and the enforcement plane that can actually apply policy consistently. NIST’s Zero Trust Architecture is useful here because it frames access as a policy decision that must be enforced at the right control points, not assumed by location alone. For workload-centric environments, Guide to SPIFFE and SPIRE shows how identity-aware workload boundaries can be translated into network-enforceable trust decisions.
That only works when security policy is specific enough to be implemented and the network is instrumented enough to observe and enforce it. If policy is written in general terms but cannot be translated into segments, allowlists, service paths, or zone boundaries, Zero Trust stays aspirational. The network team therefore needs security to define the minimum viable access relationships, and security needs the network to expose the choke points where those rules can be enforced without creating brittle exceptions.
Where Alignment Breaks Down in Real Environments
The most common failure is not a lack of intent, it is split ownership. Network teams often optimise for connectivity, availability, and clean routing, while security teams optimise for exposure reduction and containment. When those goals are not reconciled, teams end up with broad segments, permissive east-west paths, or exception-driven access that weakens the Zero Trust model.
This also shows up when teams treat segmentation as a one-time design exercise instead of a living control. Cloud changes, new applications, third-party integrations, and automation flows can all reopen paths that were supposed to stay constrained. NHIMG’s Ultimate Guide to NHIs notes that 90% of IT leaders say properly managing NHIs is essential for a successful zero-trust implementation, which reinforces a practical point: Zero Trust enforcement fails quickly when the identities driving network access are not governed alongside the network rules themselves.
Another common breakdown is ambiguity about who approves exceptions. If security defines the policy but network operations can override it informally, enforcement becomes inconsistent. If network changes are made without security review, segmentation may technically exist but fail to reflect the actual risk model. The result is a control that looks sound on paper but cannot be trusted during incident containment or lateral-movement prevention.
What Good Joint Operations Look Like
Effective collaboration is measurable. The teams should share a common asset inventory, a common map of trust zones, and a common change process for access paths that cross those zones. Policy should be expressed in terms the network can enforce, such as application path, source, destination, protocol, and environment, while security validates that those rules match business risk and containment goals.
- Review segmentation changes together before production rollout.
- Map high-value assets to explicit enforcement points.
- Track exceptions with an expiry date and a named owner.
- Re-test critical paths after application, cloud, or identity changes.
Practitioners should also verify that monitoring tells both teams the same story. If the network sees a path as permitted but security sees it as out of policy, the control is already failing. Shared telemetry, shared terminology, and shared change records make it possible to prove that Zero Trust is being enforced rather than assumed.
Practitioner takeaway: Zero Trust is enforceable only when security defines the policy outcome and network teams implement it as a constrained, observable control plane with clear ownership for change and exceptions.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 address the attack and risk surface, while NIST Zero Trust (SP 800-207), NIST CSF 2.0 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST Zero Trust (SP 800-207) | Policy Enforcement Point — Policy Enforcement Point | Zero Trust depends on network-enforced decision points, not implicit trust by location. |
| Least Privilege Access — Least Privilege Access | Shared network-security policy must restrict access to the minimum required paths and zones. | |
| Recommendation — Place enforcement at policy decision and enforcement points that consistently apply access rules. Restrict each path and segment to the minimum access required for the workload or user. | ||
| NIST CSF 2.0 | PR.AC — Identity Management, Authentication, and Access Control | Zero Trust enforcement relies on access control governance across systems and network paths. |
| GV.RM — Risk Management Strategy | Joint operating models are needed so segmentation decisions reflect security risk, not convenience. | |
| Recommendation — Align access control rules with approved policy and continuously review exceptions. Define a shared risk-based governance model for segmentation and access enforcement. | ||
| CIS Controls v8 | 6 — Access Control Management | Network segmentation and exception handling are operational access-control safeguards. |
| Recommendation — Manage access paths, exceptions, and privileges through a controlled approval and review process. | ||
| OWASP Non-Human Identity Top 10 | NHI-01 — Secrets and Credential Management | Zero Trust enforcement weakens when machine credentials and secrets can bypass intended network boundaries. |
| Recommendation — Rotate and protect credentials that can open network-relevant access paths. | ||
Related resources from NHI Mgmt Group
- How do IAM and network security teams work together on privileged access?
- How should security teams implement Zero Trust when users work everywhere?
- How should security teams enforce Zero Trust for SaaS and AI workflows without relying on network backhauling?
- How should security teams implement zero trust access across network and non-network resources without creating operational drift?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 20, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
