Introduction to LANs, WANs, and Other Kinds of Area Networks

One way to categorize the different types of computer network designs is by their scope or scale. For historical reasons, the networking industry refers to nearly every type of design as some kind of area network. Common types of area networks are

LAN: Local Area Network

A LAN connects network devices over a relatively short distance. A networked office building, school, or home usually contains a single LAN, though sometimes one building will contain a few small LANs (perhaps one per room), and occasionally a LAN will span a group of nearby buildings. In TCP/IP networking, a LAN is often but not always implemented as a single IP subnet.

In addition to operating in a limited space, LANs are also typically owned, controlled, and managed by a single person or organization. They also tend to use certain connectivity technologies, primarily Ethernet and Token Ring.

WAN: Wide Area Network

As the term implies, a WAN spans a large physical distance. The internet is the largest WAN, spanning the Earth.

A WAN differs from a LAN in several important ways. Most WANs (like the internet) aren’t owned by any one organization but rather exist under collective or distributed ownership and management.
WANs tend to use technology like ATM, Frame Relay, and X.25 for connectivity over the longer distances.
LAN, WAN, and Home Networking

Residences typically employ one LAN and connect to the internet WAN via an internet service provider (ISP) using a broadband modem. The ISP provides a WAN IP address to the modem, and all of the computers on the home network use LAN IP addresses (also called private IP addresses).

All computers on the home LAN can communicate directly with each other but must go through a central network gateway, typically a broadband router, to reach the ISP and beyond.

Other Types of Area Networks

While LAN and WAN are by far the most popular network types mentioned, you may also see references to these others:

  • Wireless Local Area Network: A LAN based on Wi-Fi wireless network technology.
  • Metropolitan Area Network: A network spanning a physical area larger than a LAN but smaller than a WAN, such as a city. A MAN is typically owned and operated by a single entity such as a government body or large corporation.
  • Campus Area Network: A network spanning multiple LANs but smaller than a MAN, such as on a university or local business campus.
  • Personal Area Network: A network that surrounds an individual. A wireless PAN (WPAN) might be created between Bluetooth devices.
  • Storage Area Network: Connects servers to data storage devices through technology like Fibre Channel.
  • System Area Network (also called Cluster Area Network, or CAN): Links high-performance computers with high-speed connections in a cluster configuration.
  • Passive Optical Local Area Network: A POLAN serves fiber by using fiber optic splitters to allow a single optical fiber to serve multiple devices.

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