What is a wide-area network (WAN), and what kinds of organizations need one?

Author: Poornima Apte

Date published: March 26, 2026

Overview

  • What is WAN?: A Wide Area Network (WAN) is a telecommunications network that extends over a large geographical distance, connecting multiple Local Area Networks (LANs) across cities, states, or countries to facilitate data exchange and communication.
  • Difference between WAN vs LAN: Unlike a Local Area Network (LAN), which connects devices within a limited area like a single building or office, a WAN connects broad geographic zones, often utilizing leased telecommunication lines, satellites, or public networks to transmit data.
  • WAN Business Solutions: Organizations utilize Enterprise WAN Services to help ensure secure, reliable, and high-speed connectivity for remote workforce support, cloud application access, and seamless digital collaboration across global branch locations.

The growth of computing around the world led to the need for computers to talk to each other no matter where they are located. Multinational companies, for example, need to connect to the same network for their computers to transmit data to each other. Access to communications networks anywhere around the globe led to the development of wide-area network (WAN) infrastructure. 

What is a wide-area network?

So, what is a wide-area network (WAN)? A WAN is a telecommunication network that's not limited by geographical constraints. In that sense, it's different from a local-area network (LAN), which defines its perimeters depending on the use case at hand—a coffee shop, a small business, a company or even a home.

What's the difference between a WAN and a LAN?

Now that you know the answer to the question, "What is a wide-area network?" it's important to note the differences between a WAN and a LAN.While the primary differentiator is geographical restriction, this vast scale leads to several other distinct differences between a WAN and a LAN:

  • Speed and Transfer Rates: Traditionally, data transfer rates and connectivity speeds are slower on a WAN, though modern software-defined wide-area networks (SD-WAN) have significantly reduced these challenges.
  • Security Risks: Because a WAN covers a wider area with more connection nodes and often utilizes public networks (including undersea fiber optic cables and wireless communications), the potential for security breaches increases compared to a closed LAN.
  • Maintenance Complexity: Managing a WAN is inherently more complex due to the sheer variety of access types and technologies required to establish long-distance connections.

What are the benefits of a WAN?

The workforce mobility needs of multinational organizations mean that today a reliable wide-area network is a necessity.

Key benefits include:

  • Anywhere Access: The shift to remote and hybrid work models in the wake of the COVID-19 pandemic demands that front-end operations and teleworkers are no longer confined by geography.
  • Cloud and SaaS Optimization: The Software as a Service (SaaS) cloud-based model relies on strong WAN infrastructure to ensure users can access critical software from any location.
  • Rapid Upgrades: A SaaS-based WAN infrastructure enables network-wide software upgrades to be completed in hours rather than days.

Who needs a WAN?

The growth of wide-area networks has also increased the ways in which it can be optimized. SD WAN, for example, uses software layered on top of WAN hardware architecture to monitor traffic and route it efficiently to the right connections. Optimized network resources lead to more efficiencies in working with a wide-area network, which will be necessary with the growth of WAN. The global market for SD WAN is forecast to hit $7.1 billion by 2026.

The software-optimized WAN also makes the underlying architecture more nimble by managing traffic and making operations more efficient. As the use cases for WAN increase, it can extend all the way to homes, as every home endpoint could become a part of global WAN systems.

Discover how Verizon can support your organization’s WAN and LAN needs.

 

The author of this content is a paid contributor for Verizon.

FAQs

An organization creates a WAN by using a third-party service provider to link an existing LAN to the WAN. A WAN can be composed of multiple types and network technologies such as a simple   internet connection or 4G/5G wireless business internet connectivity. 

Today's WAN networks employ a host of technologies: Internet, Private Network, SD WAN, Virtual Network Services, Ethernet, wireless, and Cloud.

Typically the WAN includes the customer-premises equipment (CPE), usually a router, that terminates the WAN connection and network access and then the chosen access connects to the wide area backbone network.

The Internet is a famous example of a WAN. Common business examples include:

 

  • Enterprise WANs: Connecting offices in various locations via MPLS or SD-WAN.
  • Mobile Networks:4G and 5G networks enabling broad data roaming.Banking Networks: Linking remote ATMs to a central data center.

 

The primary difference is scale and ownership. A LAN (Local Area Network) covers a limited space (like a single building) and is user-managed. A WAN spans large geographic distances, relying on leased infrastructure from telecommunication providers (like Verizon) to connect multiple LANs.

A functional WAN requires CPE (Customer Premises Equipment) like routers or modems at sites, access lines (fiber, copper, or wireless) connecting to a service provider, and core routing protocols to efficiently direct long-distance traffic.