A CMMC Enclave Isolates Your CUI and Cuts Your Level 2 Scope
Full-company CMMC is expensive and slow. Most defense contractors do not need it. You can isolate the part of your network where Controlled Unclassified Information (CUI) actually lives, so only that slice falls inside your CMMC Level 2 assessment. Fewer systems in scope means a faster assessment and a lower bill. InterSec is a Cyber-AB RPO, and we design and build the enclave that gets you there.
What an enclave delivers
A CMMC enclave is a carved-off, controlled environment that holds your CUI, so only that boundary has to meet CMMC Level 2 instead of your whole company. It narrows your scope, cost, and timeline. CUI inside the enclave still requires Level 2, never Level 3. Enclaves are often paired with GCC High and can be managed by an MSP.
What is a CMMC enclave?
A CMMC enclave is a separated, controlled part of your environment, built to store and process CUI, so that only that segment falls inside your CMMC Level 2 assessment boundary. Everything else, the front office, the general machines, the systems that never touch controlled data, stays outside the boundary.
Think of the difference this way. Without an enclave, your whole network is the thing an assessor examines. With an enclave, the assessor examines one well-defined room, not the entire building. The controls still have to be real and the evidence still has to hold up, but the surface you have to defend is a fraction of the size.
One point to settle up front, because the market gets it wrong constantly. CUI requires CMMC Level 2, not Level 3. Level 3 is a narrow, government-led case for a small set of high-risk programs. If you handle CUI, an enclave helps you meet Level 2, which is almost certainly your target.
Enclave versus enterprise-wide scoping
So why not just secure everything? You can, but you will pay for it in time and money you did not need to spend. Here is the trade-off most pages will not put in writing.
| Enterprise-wide scoping | CUI enclave | |
|---|---|---|
| In-scope assets | Every workstation, server, and user | Only the systems and users that touch CUI |
| Controls to implement | All 110 applied across the company | All 110 applied to one small segment |
| Assessment effort | Longer, larger evidence library | Shorter, smaller evidence library |
| POA&M items | More gaps to track and close | Fewer gaps in the 180-day window |
| Cost direction | Higher | Lower |
| When it fits | CUI is everywhere, or you are mostly CUI work | CUI is contained to a team or workflow |
The pattern is clear. The fewer assets you put in scope, the less you implement, evidence, and maintain. For most small and mid-size contractors, the CUI touches a handful of people and systems, which makes the enclave the obvious move.
What belongs inside the enclave
Getting the boundary right is the single biggest cost lever you have, so this is where the work starts. The question is simple to state and harder to answer honestly. Which systems, people, and data flows actually touch CUI?
That means tracing CUI everywhere it goes. The users who open it, the workstations and servers that store or process it, the email and file storage it moves through, and the external service providers and cloud services in the path. It also means writing down what stays out, and why. A clear in-scope versus out-of-scope decision log is not busywork. It is the document that keeps your boundary small under assessment, when an assessor asks why a given system is excluded.
Draw this boundary too wide and you pay to secure machines that never needed to be in scope. Draw it carelessly and you miss a system that holds CUI, which fails you later when fixes cost the most. Draw it deliberately, and you have the foundation for everything else.
GCC and GCC High and the enclave, in plain terms
You will hear GCC and GCC High mentioned constantly in CMMC conversations, usually without explanation. Here is the plain version. GCC and GCC High are Microsoft 365 government-cloud tenants built for federal data. GCC High is the common answer for hosting CUI. GCC works for many Level 1 and FCI-only environments. The right choice depends on the data you actually hold.
Why does this matter to your budget? Because over-buying GCC High when you do not need it is one of the most common avoidable expenses in CMMC. A good scoping exercise tells you which tier your data requires before you sign a license agreement. And the cloud is not the only option. An enclave can also live on-premises or on another FedRAMP-authorized platform. The goal is to match the environment to your CUI, not to default everyone to the most expensive tier.
How an enclave cuts your assessment scope and cost
The mechanism is straightforward once you see it. Every asset in scope has to demonstrate the relevant controls from the 110 in NIST SP 800-171. Cut the number of in-scope assets, and you cut the number of times you implement and evidence each control. Your evidence library shrinks. Your POA&M has fewer open items to close inside the 180-day window. Your assessment takes less time, and a C3PAO assessment that takes less time generally costs less.
Scope is also the lever that ages badly if you wait. Starting November 10, 2026, a CMMC Level 2 assessment becomes a condition of award in applicable DoD contracts. The contractors who scoped tight and started early will be assessment-ready while others are still arguing about boundaries. For the full picture on pricing, see what CMMC certification costs. One number you can ignore while you budget is the $760 CCP exam fee, which is an individual's certification cost, not a price for your company's compliance.
What you get
An enclave engagement with InterSec produces the artifacts an assessor expects, scoped to the enclave rather than your whole company.
- A CUI boundary diagram
- An asset and data-flow inventory
- An in-scope versus out-of-scope decision log
- The enclave architecture itself, with network segmentation, multi-factor authentication, FIPS-validated encryption, boundary protection, and logging
- A GCC or GCC High migration where it fits your data
- An SSP and POA&M scoped to the enclave
- A C3PAO mock review before the real assessment
This is the same lifecycle our CMMC compliance consulting program runs, focused on the slice of your network that matters.
Proof
This is not theory. For a multi-site Navy prime, we used VLAN segmentation and a CUI enclave architecture to scope the environment across five Navy ports, and moved the SPRS score from minus 203 toward assessment-ready. For a specialty metals supplier, we built a clean four-user, VLAN-isolated CUI environment with GCC, so four people carry the CUI and the rest of the business stays out of scope. Different shops, same idea. Put the CUI in one controlled place, and the assessment gets smaller. For the architecture in depth, read our enclave architecture in detail.
Where to start
The right boundary starts with a clear picture of where your CUI lives, which is exactly what a CMMC readiness assessment gives you. Scope first, build second. That order keeps the enclave small and the bill honest.
CMMC enclave questions
What is a CMMC enclave?
A CMMC enclave is a separated, controlled part of your network built to store and process CUI, so only that segment falls inside your CMMC Level 2 assessment boundary. The rest of your environment stays out of scope. It is the most direct way for a contractor to meet Level 2 without securing the entire company.
Does an enclave reduce my CMMC assessment scope and cost?
Yes. Every system in scope has to evidence the relevant NIST SP 800-171 controls. An enclave shrinks the number of in-scope systems, so you implement and document less, your evidence library is smaller, and your POA&M has fewer items. A shorter, smaller assessment generally costs less than an enterprise-wide one.
Do I need GCC High for a CMMC enclave?
Not always. GCC High is the common choice for hosting CUI, but GCC works for many Level 1 and FCI-only environments, and an enclave can also run on-premises or on another FedRAMP-authorized platform. The right answer depends on the data you hold. Over-buying GCC High when you do not need it is a frequent, avoidable expense.
Can a small contractor use an enclave, or is it only for large companies?
Small contractors benefit most. We have built a four-user CUI enclave for a specialty metals supplier so only four people carry CUI and the rest of the business stays out of scope. The smaller your team, the more an enclave protects you from securing systems that never needed to be in scope.
What CMMC level does an enclave help with?
Both Level 1 and Level 2, though the cost savings are largest at Level 2, where all 110 controls apply. To be clear, CUI requires Level 2, not Level 3. An enclave keeps that Level 2 boundary as small as possible.
Does InterSec build the enclave and also assess it?
No. InterSec is a Cyber-AB RPO, so we design and build your enclave and prepare you for assessment. The official Level 2 assessment is run by a separate, accredited C3PAO. The same firm cannot both prepare and assess you, and that separation is required. See how our full CMMC consulting engagement works.
Find out how small your CMMC scope can be.
Most contractors put far more in scope than they need to. Book a 30-minute consultation and we will show you where your CUI lives and how an enclave can cut your Level 2 scope, timeline, and cost. Or send your details below and we will reply within one business day.