Not All Networks Are the Same
Networks come in different sizes and serve different purposes. The size and reach of a network determines its type. Let's look at the four main categories.
PAN (Personal Area Network)
A PAN is the smallest type of network — it connects devices around a single person. Your phone connected to your wireless earbuds, your laptop connected to your smartwatch, your tablet connected to your keyboard — these are all PANs.
PANs typically cover a range of about 10 meters (33 feet). They use technologies like Bluetooth, NFC (Near Field Communication), or USB. They're personal because they're centered around one person and their devices.
LAN (Local Area Network)
A LAN connects devices in a limited area — a home, office, school, or building. Your home Wi-Fi network is a LAN. The network in your school's computer lab is a LAN. The network connecting printers and computers in an office is a LAN.
LANs are privately owned and managed. They offer high-speed connections (usually 100 Mbps to 10 Gbps) and low latency. The downside is limited reach — LANs typically span a single building or campus.
Here's a simple LAN diagram:
┌──────────┐ ┌──────────┐
│ Desktop │ │ Laptop │
└────┬─────┘ └────┬─────┘
│ │
│ ┌────────┐ │
└────┤ Switch ├───┘
└───┬────┘
│
┌────────┴────────┐
│ Wi-Fi Router │
│ (Gateway) │
└────────┬────────┘
│
┌───┴───┐
│ Server│
└───────┘
WAN (Wide Area Network)
A WAN spans a large geographical area — a city, country, or even the entire planet. The internet is the largest WAN in existence. A company's network connecting offices in different cities is also a WAN.
WANs use public infrastructure (telephone lines, fiber optic cables, satellites) to connect distant LANs. They're slower and more expensive than LANs because the data has to travel longer distances and pass through more intermediaries.
The key difference from a LAN: WANs are usually operated by Internet Service Providers (ISPs) and telecommunications companies, not by the organizations that use them.
MAN (Metropolitan Area Network)
A MAN is a network that covers a city or large campus. It's bigger than a LAN but smaller than a WAN. A city-wide cable TV network or a university network spanning multiple campuses across a city are examples of MANs.
MANs bridge the gap between LANs and WANs, providing high-speed connectivity across a metropolitan area. They're often used by ISPs to connect neighborhoods and business districts.
Comparison at a Glance
PAN LAN MAN WAN
~10m ~1km ~50km Unlimited
Bluetooth Ethernet Fiber Fiber/Satellite
Home Building City Country/World
Personal Private Regional ISP/Telecom