Network as a Service: Definition & How It Works

Network as a Service (NaaS) is a cloud-based model where organizations rent network infrastructure—such as routers, switches, firewalls, and bandwidth—from a provider instead of buying and managing physical hardware. You consume networking capabilities on a subscription or pay-as-you-go basis, much like software as a service (SaaS). This guide explains what NaaS really is, how it works, what it costs, and how to decide if it fits your organization.

Formula

The total cost of a NaaS contract can be estimated with:

Total Cost = Bandwidth (Gbps) × Monthly Price per Gbps (USD) × Contract Term (months)

• Bandwidth (b) – the committed data transfer capacity in gigabits per second (Gbps).
• Monthly price per Gbps (c) – the provider’s rate for each Gbps of capacity, which varies by region and service level.
• Contract term (t) – the length of the agreement in months.

The calculator gives the total contract cost and the monthly recurring cost. It assumes a flat rate per Gbps; real contracts often include setup fees, traffic overage charges, and tiered pricing.

Worked Example

Using the default values: 12-month term, 10 Gbps bandwidth, and $50 per Gbps per month.

1. Monthly cost = 10 Gbps × $50/Gbps = $500
2. Total cost = $500/month × 12 months = $6,000

The calculator shows a total contract cost of $6,000 and a monthly cost of $500.

What Is Network as a Service (NaaS)?

NaaS is a delivery model for network connectivity and security services that are provisioned, managed, and scaled through a cloud platform. Instead of buying switches, routers, and firewalls, you subscribe to the capabilities you need. The provider owns and operates the physical and virtual infrastructure, and you access it through a portal or API.

NaaS is not a single technology but a set of services that can include:

• Virtual private networks (VPNs) and secure access service edge (SASE)
• Software-defined wide area networking (SD-WAN)
• Firewall and intrusion prevention as a service
• Bandwidth on demand and WAN optimization
• Load balancing and application delivery

The term Network as a Service became common in the early 2010s as cloud computing matured. It’s a standard industry term, not slang, and is used in vendor documentation, analyst reports, and enterprise IT discussions. You might hear it in a sentence like: “We moved our branch offices to NaaS to avoid replacing aging routers every five years.”

How NaaS Works

NaaS relies on software-defined networking (SDN) and network function virtualization (NFV). The provider runs the control plane in the cloud, and customer sites connect through edge devices that forward traffic according to policies set in the portal.

A typical NaaS deployment involves:

1. Edge appliance – a small physical device at each location that connects to the provider’s cloud.
2. Cloud controller – the management interface where you define routing, security, and quality-of-service rules.
3. Provider backbone – the carrier’s global network that carries traffic between your sites and to the internet.
4. API and automation – you can programmatically change bandwidth, add sites, or adjust policies.

Because the control logic is centralized, changes propagate quickly. For example, if a new branch opens, you ship a pre-configured edge device, plug it in, and it pulls its configuration from the cloud—no on-site IT needed.

Benefits and Drawbacks

Organizations choose NaaS for several reasons:

• Lower upfront cost – no large capital expense for hardware.
• Elastic scaling – add bandwidth or features as needed, often in minutes.
• Reduced management burden – the provider handles upgrades, patches, and monitoring.
• Global reach – providers have points of presence in many regions, simplifying multi-site connectivity.

However, there are trade-offs:

• Recurring cost – over several years, subscription fees can exceed buying hardware.
• Vendor lock-in – moving to another provider may require reconfiguration and new edge devices.
• Dependency on internet or provider backbone – if your connection to the provider fails, you lose network management.
• Less customization – some NaaS offerings lack the deep configuration options of traditional enterprise gear.

NaaS vs. Traditional Networking

Traditional networking involves purchasing hardware, installing it, and maintaining it with your own staff. You pay for capacity upfront, and scaling means buying more equipment. NaaS shifts that to an operating expense, with the provider responsible for the lifecycle.

Think of it like the difference between owning a car and using a ride-hailing service. Owning gives you control and long-term value if you drive a lot; hailing gives you flexibility and no maintenance, but you pay per ride. Similarly, a company with stable, predictable traffic might save money with traditional gear, while a fast-growing startup might prefer NaaS.

A common misconception is that NaaS is only for small businesses. In reality, large enterprises use NaaS for specific use cases like temporary offices, acquisitions, or new regions where buying hardware isn’t practical.

How to Choose a NaaS Provider

When evaluating NaaS offerings, consider these factors:

• Coverage – does the provider have points of presence in the regions you operate?
• Service level agreements (SLAs) – what uptime and latency guarantees are offered?
• Security features – are firewalls, encryption, and zero-trust access included?
• Integration – does it work with your existing cloud providers (AWS, Azure, Google Cloud)?
• Pricing model – is it per site, per Gbps, or per user? Are there overage charges?
• Migration path – how easy is it to move away if you’re unhappy?

Start by defining your traffic patterns and growth projections. If you expect a 50% increase in bandwidth needs each year, a flexible NaaS contract might be more cost-effective than buying hardware that becomes obsolete.

Common Problems and How to Avoid Them

NaaS deployments can hit snags. Here are common issues and what to do:

• Underestimating bandwidth – video conferencing and cloud backups consume more than you think. Monitor usage for a few months before committing.
• Ignoring egress fees – some providers charge for data leaving their network, which can inflate bills. Read the fine print.
• Poor edge device placement – the physical appliance must be on a stable, fast connection. Don’t put it behind a weak Wi-Fi link.
• Lack of redundancy – if you have a single connection to the provider, you have a single point of failure. Ask about dual-path options.

Costs and Pricing Models

NaaS pricing varies widely. Common models include:

• Per-site – a flat monthly fee for each location, often including a basic edge device.
• Per-Gbps – you pay for the bandwidth you reserve, as in the calculator above.
• Per-user – common for security-focused services like SASE, where the price scales with the number of employees.
• Usage-based – you pay for actual traffic, which can be unpredictable but is the most flexible.

Most contracts include a minimum term (12 or 36 months) and an early termination fee. Always calculate the total cost of ownership over the expected life of the service, including any hardware rental fees and professional services for setup.

Frequently Asked Questions

Is NaaS the same as SD-WAN?

No. SD-WAN is a technology that simplifies WAN management, and it is often a component of NaaS. NaaS is a broader service model that can include SD-WAN, security, and other network functions delivered as a subscription. You can buy SD-WAN software on its own, but NaaS bundles it with the underlying transport and management.

Can NaaS replace my existing firewall?

It can replace some firewall functions if the NaaS offering includes security services like next-generation firewall (NGFW) or secure web gateway. However, for highly regulated environments with specific compliance needs, you may still need dedicated on-premises security appliances. Review the provider’s security certifications and features.

How long does it take to deploy NaaS?

For a single site, it can be as fast as a few days if the provider ships a pre-configured edge device and you have internet access. Multi-site deployments take longer because each location needs a device and a connection. Most providers quote 2–6 weeks for a typical rollout.

What happens if my internet connection goes down?

If the edge device loses connectivity to the provider’s cloud, some NaaS services can continue to forward traffic based on local policies, but you lose the ability to make changes or use cloud-based security features. Always ask about the device’s behavior in offline mode and whether it supports a backup connection.

Is NaaS secure?

Security depends on the provider’s implementation. Reputable providers use encryption (IPsec or TLS) for traffic in transit and offer features like zero-trust access and micro-segmentation. However, you are trusting the provider with your network metadata and policy configuration. Read the provider’s security whitepapers and check for independent audits.

Can I use NaaS for a small business with one office?

Yes, but it may be overkill. A single site might be better served by a standard business internet connection with a router and a cloud-based security service. NaaS becomes valuable when you have multiple locations, remote workers, or need to scale quickly.

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in t | Contract term | months | 12 | 1 | 60
in b | Bandwidth | Gbps | 10 | 1 | 100
in c | Monthly cost per Gbps | USD | 50 | 1 | 10000
out total | Total contract cost | USD | b * c * t | 0
out monthly | Monthly cost | USD | b * c | 0