LAN vs WAN

LAN: one place

LAN stands for local area network. It's the devices connected in one location: your home, a classroom, or one floor of an office.

When your phone, laptop and TV all join the same Wi-Fi, they're on one LAN. They connect through one box, usually your home router (which has a small switch and a Wi-Fi access point built in), and they can reach each other directly, like casting a video from your phone to the TV.

What makes it a LAN is the single location, not the number of devices. A big office building with thousands of computers is still a LAN.

WAN: far apart

WAN stands for wide area network. A WAN links networks that are far apart, across cities or even countries.

Picture a company with one office in Seattle and another in Miami. Each office has its own LAN. To let them work together, the company joins the two LANs with a WAN, usually over links rented from a telecom or internet provider.

The biggest WAN of all is the internet: millions of networks around the world, all linked together.

Think of it like roads

Your LAN is your driveway and the streets in your neighborhood. Getting around them is quick and local.

The WAN is the highway that connects your town to every other town. Your router sits at the on-ramp: it's where traffic leaves your home network and heads out toward the rest of the world.

Local means LAN. Long distance means WAN.

Try it yourself

Open your router's app, or its admin page (often 192.168.1.1 or 192.168.0.1 in a browser), and look for the list of connected devices. Everything on that list is on your LAN. You'll also see a WAN or Internet port or status page: that's the side of the router that faces your internet provider.

Good to know

• A LAN is defined by one location, not by its size.
• WANs usually ride on links from a provider, either leased lines or the internet itself.
• Cisco calls the internet the largest WAN.
• At home, the router connects your LAN to your provider's network, usually through a modem.

For CCNA learners

This lines up with CCNA 200-301 exam topic 1.2, describe characteristics of network topology architectures, which covers LANs, WANs and small office/home office (SOHO) networks: know what makes a network local versus wide area.