How to implement Network as a Service: from assessment to go-live

Implementing Network as a Service means replacing hardware-centric enterprise networks with a subscription-based, software-defined connectivity model delivered by a third-party provider through cloud management and APIs. Unlike most guides written from a vendor perspective, this playbook walks enterprise IT managers and network architects through readiness assessment, architecture design, vendor selection, phased migration, and post-go-live operations. Whether you are retiring MPLS, consolidating SD-WAN, or enabling SASE, this guide gives you a practical framework for making NaaS work inside your organization.

What is Network as a Service?

Network as a Service gives enterprises a way to consume networking as an operating expense instead of buying, building, and maintaining the full stack themselves.

According to Analysys Mason*, worldwide NaaS connectivity revenue, including retail and wholesale connectivity, is forecast to grow at a 42% CAGR between 2024 and 2029, reaching USD14.7 billion by 2029.That momentum reflects real enterprise pressure: hybrid work, cloud migration, rising network complexity, and the cost of frequent hardware refreshes.

For buyers, the appeal is not just lower capital spend. Network as a Service can simplify procurement, accelerate rollout, centralize policy, and align networking with SDN, NFV, cloud networking, and integrated security models such as SASE.

NaaS vs. MPLS, SD-WAN, and traditional WAN: a decision matrix

Choose NaaS when you want a managed operating model, choose SD-WAN when you mainly want overlay control, and keep MPLS where it still supports a specific business or technical requirement.

A common misconception is that Network as a Service and SD-WAN mean the same thing. They do not. SD-WAN is primarily an overlay technology for traffic steering and transport abstraction. NaaS is broader: it can include SD-WAN, but it also includes provider operations, lifecycle management, security integration, commercial structure, and often edge deployment.

MPLS still makes sense in some ultra-specific cases, especially where deterministic transport, legacy compliance, or strict latency requirements remain critical. But for most enterprises, the strategic choice is between overlay modernization and a broader service-led transformation. If you want better routing and path control, SD-WAN may be enough. If you want to move from ownership to consumption, Network as a Service is the better fit.

Phase 1 — NaaS readiness assessment: are you ready to migrate?

Before you buy NaaS, you need to understand your current network, your target outcomes, and the internal stakeholders who will own the change.

The biggest mistake enterprises make is assuming that Network as a Service is plug-and-play. It is not. NaaS changes how networking is delivered, supported, budgeted, and governed. A readiness assessment is what turns NaaS from a promising concept into a controlled migration.

A useful readiness framework has five dimensions.

First, assess the current network estate: WAN topology, MPLS links, branch connectivity, data center dependencies, internet breakout strategy, hardware age, and cloud interconnects.

Second, assess the application landscape: latency-sensitive apps, SaaS traffic, branch-to-cloud dependencies, and systems that still rely heavily on on-prem infrastructure.

Third, assess security posture: segmentation, remote access, identity controls, logging, and readiness for SASE or ZTNA.

Fourth, assess team capability: can the network team work with APIs, orchestration, and Infrastructure as Code, or is it still operating mainly through manual administration?

Fifth, assess financial readiness: depreciation schedules, supplier commitments, and whether the business is prepared to shift from CapEx to OpEx.

Stakeholder alignment should happen early. In most enterprises, the assessment phase should include NetOps, SecOps, CloudOps, AppOps, Finance, Procurement, and HR. NaaS affects not only the network, but also contracts, support models, staffing, and governance.

When not to implement NaaS (and what to do instead)

NaaS is a poor fit when your environment depends heavily on bespoke infrastructure, highly specific latency targets, or strict on-prem control.

There are cases where Network as a Service is simply not the right move. That includes environments with strict hardware residency requirements, OT networks with ultra-low-latency expectations, and organizations whose traffic remains mostly internal with limited cloud migration planned.

In those cases, a transitional approach often works better. Some enterprises should implement SD-WAN first, then revisit NaaS in 12 to 18 months. Others should keep a private MPLS or carrier-managed core while adding an SDN or SD-WAN overlay. A third group should adopt a hybrid model: NaaS for cloud-facing workloads and branch connectivity, while retaining traditional control over core foundational elements.

Phase 2 — NaaS architecture design: SDN, NFV, and the underlay/overlay model

A strong NaaS architecture separates transport from policy, virtualizes network functions, and centralizes control through orchestration and cloud management.

At an architectural level, Network as a Service is best understood as four layers: the underlay, the overlay, the control plane, and the management/orchestration layer.

The underlay is the transport foundation, such as broadband, private IP, Ethernet, internet, or wireless access. The overlay is where policy-driven connectivity lives, often through SD-WAN or another software-defined abstraction. The control plane uses SDN to distribute logic. The management layer exposes dashboards, APIs, workflows, and provisioning tools that let the enterprise operate the service without managing every device directly.

NFV makes the model scalable. Instead of treating routers, firewalls, VPN devices, or WAN optimizers as fixed appliances, NaaS can deliver them as software-based VNFs running on uCPE or commodity hardware. That reduces dependence on box-by-box refresh cycles and makes services easier to provision or retire.

A useful buyer-side test is whether the service is truly on-demand, observable, manageable, programmable, secure, flexible, and modular. If it is not programmable or observable, it is much harder to treat it as a strategic NaaS platform.

Foundational Network vs. Network Services: what to migrate first

The best migration sequence starts with change-heavy services, not the most stability-critical backbone assets.

A practical way to plan NaaS architecture is to divide the estate into two layers.

The Foundational Network includes backbone links, core routing, and data center interconnects. These elements are stable, heavily governed, and high-risk to change.

Network Services include branch connectivity, cloud on-ramps, VLAN changes, VPN provisioning, remote access, firewall rules, and edge policy delivery.

In most enterprises, Network Services should move first. They change more often, benefit more from automation, and fit naturally into an orchestration-driven delivery model. The Foundational Network should usually move later, once the provider has proven reliability, observability, and brownfield coexistence.

SASE, ZTNA, and security architecture in NaaS

Security should be built into the NaaS rollout from day one, not added after the network is live.

SASE is one of the most natural layers to align with Network as a Service because it combines networking and cloud-delivered security functions such as SWG, CASB, FWaaS, and ZTNA. That makes security central to NaaS architecture rather than a separate track.

For ZTNA, the design principle should be the least privilege. In practical terms, that means access decisions are based on identity, device posture, and context, not just network location. This is especially important in hybrid and cloud-first environments where the traditional perimeter no longer matches the way users and applications interact.

From a buyer perspective, require evidence of integrated SASE, support for ZTNA, centralized policy management, and relevant certifications such as ISO/IEC 27001, SOC 2 Type II, PCI-DSS, or FedRAMP, depending on your environment.

Phase 3 — NaaS vendor selection: evaluation criteria and RFP framework

The right NaaS provider is the one that can run the service inside your environment, not just present a strong demo.

The NaaS market includes both NaaS providers and NaaS enablers. Providers deliver the service end to end, including operations, support, orchestration, and commercial accountability. Enablers supply the technology building blocks, such as networking, automation, and security platforms, but do not deliver the full service model on their own.

That distinction matters because Network as a Service is not just a technology purchase. It is an operating model purchase.

Use a scored RFP, not a narrative comparison. The most useful evaluation criteria are:

A strong RFP should force vendors to show how they will coexist with your current infrastructure, how much control the enterprise retains, and how automation responsibilities are split between customer and provider.

NaaS providers vs. NaaS enablers: understanding the market

From a buyer perspective, the difference is simple: providers deliver the service, while enablers supply the technology stack. That means enterprises should evaluate who owns service delivery, incident handling, lifecycle support, and operational accountability.

For many enterprises, the hybrid model is the strongest option because it combines mature technology with managed operational delivery.

Key SLA parameters and contractual terms to negotiate

At minimum, enterprise buyers should negotiate around availability, latency, MTTR, bandwidth flexibility, change processes, escalation structure, and service credits. They should also understand which parts of the service are truly elastic and which remain recurring charges throughout the term.

This matters because long contracts are common. Providers often need enough time to amortize equipment costs, which is why NaaS agreements frequently run 3 to 5 years or longer. As a result, the financial upside often becomes clearer only after Year 3.

That is why exit clauses, data portability, observability access, and governance around adds, moves, and changes should be negotiated early, not left until the final legal review.

Phase 4 — NaaS migration strategy: phased approach from pilot to full rollout

A phased approach works best because it lets enterprises validate service levels, governance, support quality, observability, and user impact before scaling. The pilot should not only test connectivity. It should test whether the provider can operate effectively inside your environment.

A practical migration roadmap looks like this:

1. Phase 0 (0-3 months): readiness assessment, RFP, commercial alignment, and pilot design
2. Phase 1 (3-6 months): launch a greenfield pilot or low-risk brownfield insertion
3. Phase 2 (6-18 months): expand to additional branches, internet breakout, cloud on-ramps, and SD-WAN integration
4. Phase 3 (18-36 months): standardize more of the estate, move selected foundational elements, and deepen security handoff
5. Phase 4 (ongoing): optimize performance, enable self-service, strengthen automation, and introduce AIOps

This sequence reduces risk while keeping transformation moving. The best NaaS programs treat the pilot as a governance and operations test, not just a technical proof of concept.

Greenfield vs. brownfield NaaS deployment

Greenfield is the easiest place to start, but brownfield capability is what separates a mature NaaS provider from a limited one.

New branches, office relocations, new cloud regions, and fresh internet breakout requirements are ideal greenfield use cases because they involve fewer legacy dependencies. They are easier to standardize and faster to evaluate.

Brownfield deployments are more complex because they require coexistence with existing WAN, campus, security, and provider contracts. If your estate is mostly brownfield, test providers on how well they can integrate with the current environment, not just on how quickly they can deploy a clean new site.

A practical rule: if less than 20% of near-term change is greenfield, start with a brownfield-capable pilot. If more than 50% of the transformation is tied to new sites, new cloud connections, or refresh-driven changes, you can usually move faster.

Phase 5 — NaaS operations: automation, observability, and AIOps

Once the service is live, the value of Network as a Service shows up in operations. The goal is not just to outsource tickets. The goal is to run a network that is easier to provision, easier to understand, and easier to optimize than a hardware-centric environment.

The first pillar is automation. NaaS should support self-service provisioning, policy-based deployment, and zero-touch workflows where governance allows. That includes APIs, templates, reusable configurations, and automation tools such as Terraform and Ansible.

The second pillar is observability. Mature NaaS should provide end-to-end visibility across the underlay, overlay, edge, security controls, and cloud paths. Strong network observability reduces time to identify the real source of a problem and makes it easier to correlate performance, availability, and policy events.

The third pillar is AIOps. In mature environments, telemetry should not just feed dashboards. It should improve prediction, detection, and remediation. That is where centralized orchestration becomes strategically valuable.

A useful operations loop looks like this:

Source of Truth → Orchestration → Automation Engine → Observability → Feedback Loop

Infrastructure as Code (IaC) and network automation for NaaS

Infrastructure as Code should be part of the NaaS operating model from the start. In practice, that means version-controlled templates, peer review, rollback discipline, Git-based approval, and API-driven change execution instead of one-off device changes.

A realistic automation maturity path looks like this:

1. CLI scripting
2. Ansible playbooks
3. Intent-based templates
4. Git-based review and approval
5. CI/CD-style workflows for network change

At scale, the missing piece is often a Source of Truth that defines desired state for sites, policies, services, and dependencies. Without that foundation, NaaS self-service becomes little more than an outsourced change queue.

*Source: https://www.analysysmason.com/research/content/articles/naas-revenue-forecast-rma21/

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Are you looking for more information about NaaS? Take a look at NaaS glossary.

FAQ: Common questions about implementing NaaS in enterprise environments

What is the difference between NaaS and SD-WAN?

SD-WAN is an overlay technology for traffic steering and transport optimization. Network as a Service is broader. It can include SD-WAN, but it also includes lifecycle support, managed operations, security, orchestration, and the commercial model.

How long does a NaaS implementation take?

A pilot typically takes 3 to 6 months, a broader rollout often takes 6 to 18 months, and large enterprise standardization may take 18 to 36 months or more, depending on brownfield complexity and contract timing.

What are the biggest NaaS implementation risks?

The most common risks are vendor lock-in, poor brownfield fit, weak internal alignment, unrealistic cost assumptions, and loss-of-control concerns.

Which enterprises should not implement NaaS?

Organizations with highly bespoke on-prem environments, extreme latency sensitivity, or little cloud migration planned may not be ready. In those cases, a hybrid model or SD-WAN-first strategy is often safer.

How does NaaS work with SASE?

Very naturally. SASE combines networking and cloud-delivered security functions such as SWG, CASB, FWaaS, and ZTNA, which makes it one of the most logical security layers to integrate into a NaaS rollout.

What is the difference between NaaS providers and NaaS enablers?

Providers deliver the service, operations, and support. Enablers provide the platforms and technical building blocks. Enterprises often need both.

Can NaaS replace MPLS completely?

In many enterprise WAN environments, yes. But some organizations will keep MPLS for specific latency, compliance, or determinism requirements while using NaaS elsewhere.

How do I evaluate NaaS providers for my enterprise?

Use a scored framework built around coverage, SLA quality, security maturity, API openness, cloud ecosystem support, pricing clarity, brownfield capability, and referenceability.

Is NaaS suitable for regulated industries?

Yes, but only with strong due diligence around certifications, auditability, data handling, segmentation, and zero-trust access controls.