What is a CUI enclave?

A CUI enclave is a logically or physically isolated environment where Controlled Unclassified Information (CUI) is processed, stored, and transmitted. The enclave is bounded by strict access controls, network segmentation, and monitoring — all of which are in scope for CMMC assessment. Everything outside the enclave that does not touch CUI can be out of scope.

Why does enclave design matter for CMMC?

CUI enclave design is the single most important architectural decision in your CMMC program. The scope of your C3PAO assessment — and therefore the cost and complexity of compliance — is directly proportional to the size of your CUI environment. A well-designed enclave with a minimal footprint can dramatically reduce the number of systems, users, and controls in scope.

What technologies are used in a CUI enclave?

Common CUI enclave technologies include Microsoft Azure Government (GCC High) or AWS GovCloud for cloud environments, Terraform or Azure Bicep for infrastructure as code, Microsoft Entra ID (Azure AD) for identity and MFA, network segmentation via VLANs or NSGs, and endpoint detection and response (EDR) tools. The specific stack depends on your organization's existing infrastructure and budget.

How does a CUI enclave reduce CMMC assessment scope?

When CUI is confined to a defined enclave, only the systems, users, and networks within that enclave are in scope for your C3PAO assessment. Systems that never touch CUI — such as general corporate workstations, HR systems, or marketing infrastructure — fall outside the assessment boundary. This can reduce the number of in-scope assets from hundreds to tens, significantly lowering assessment cost and complexity.

CUI Enclave Design

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CUI Enclave Design

"Smallest possible CUI scope. Strongest possible controls."

CMMC Gap Analysis SPRS Score Assessment CUI Enclave Design Microsoft GCC High Licensing PreVeIL Encrypted Collaboration Managed SOC & Compliance NIST 800-171 Consulting CMMC Readiness Consulting C3PAO Preparation DFARS 252.204-7012 NJ CMMC Consulting CMMC for Manufacturers CMMC for Machine Shops

Architect a Minimum-Scope CUI Boundary — Enforced by IaC

The scope of your CMMC assessment is determined by where CUI flows in your environment. VIS LLC designs a minimum-scope CUI enclave using Terraform — isolating CUI-handling systems from the rest of your infrastructure. Smaller scope means fewer systems to harden, fewer controls to implement, and a faster path to C3PAO assessment.

A CUI enclave is not just a network segment — it's a boundary enforced by policy, identity, and monitoring. VIS LLC designs it in Terraform, implements it in Azure or AWS GovCloud, and validates it against NIST 800-171 access control requirements.

Key Features

CUI flow mapping and scope definition

We map where CUI enters, moves through, and exits your environment to establish the minimum defensible assessment scope.

Minimum-scope enclave architecture

The enclave is designed to include only the systems that must handle CUI — reducing your CMMC assessment surface area.

Terraform-based network segmentation

Network segmentation is implemented as Infrastructure as Code, making it reproducible, auditable, and drift-resistant.

Zero Trust access controls for the enclave

Access to CUI systems is controlled by identity, device posture, and least-privilege — not network location.

MFA and privileged access management

Multi-factor authentication and privileged access management are enforced at the enclave boundary for all CUI-handling accounts.

IaC-enforced configuration baseline

Every enclave configuration setting is declared in code, ensuring new deployments inherit the compliant baseline automatically.

Built on Microsoft Government Cloud

For contractors handling CUI, VIS builds the enclave on a Microsoft government-cloud-aligned stack. Microsoft 365 GCC High and Azure Government provide the compliant foundation, while identity, device, and access controls are enforced with Microsoft Entra ID, Intune, and Defender. Encrypted collaboration runs on PreVeIL so email and file exchange stay protected in transit and at rest.

Entra ID identity & access

MFA, Conditional Access, named locations, identity governance, and privileged-access restrictions for every CUI user.

Intune & Defender endpoint control

Compliance policies, BitLocker enforcement, security baselines, device restrictions, and Defender onboarding for managed CUI endpoints.

AVD or Windows 365 virtual desktops

A government-cloud virtual workspace with session restrictions for clipboard, printing, USB, and local-drive mapping to keep CUI inside the boundary.

PreVeIL encrypted collaboration

End-to-end encrypted email and file sharing for CUI, with external-sharing workflows for customers and suppliers.

GCC High Licensing

PreVeIL Collaboration

Managed SOC

AVD vs. Windows 365

Both virtual-workspace options stay on the table through the design milestone. The final recommendation depends on your user count, concurrency, engineering workload, CAD/GPU requirements, administrative capacity, and budget. Azure Virtual Desktop (AVD) offers flexible, consumption-based scaling and pooled session hosts; Windows 365 Government provides fixed-cost, per-user Cloud PCs that are simpler to administer. VIS helps you choose based on how your CUI and engineering work actually runs.

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