Computer networks can be classified according to their size, purpose, connection method, and geographic coverage. A network connecting a smartwatch to a smartphone is very different from a network connecting offices across multiple countries. Understanding the major network types helps technicians identify the equipment, technologies, and troubleshooting methods that may be used in different environments.
Common network types include personal area networks, local area networks, wireless local area networks, metropolitan area networks, wide area networks, and storage area networks. These are commonly abbreviated as PAN, LAN, WLAN, MAN, WAN, and SAN.
Personal Area Network
A personal area network, or PAN, is a small network built around an individual person and their devices. A PAN normally covers only a short distance, such as the area around a user’s body, desk, vehicle, or room.
PAN connections are commonly created using Bluetooth, Near-Field Communication, USB, or another short-range technology.
Examples of devices connected through a PAN include:
A smartphone connected to wireless earbuds
A smartwatch synchronized with a smartphone
A laptop connected to a Bluetooth mouse
A tablet connected to a wireless keyboard
A smartphone connected to a vehicle’s entertainment system
A phone providing internet access to a laptop through tethering
A PAN is usually owned and managed by one individual rather than an organization.
Bluetooth PAN Example
A user may connect a smartwatch, wireless earbuds, and a fitness tracker to a smartphone. Each device communicates over a short distance and exchanges information with the phone.
The smartwatch may receive notifications, the earbuds may receive audio, and the fitness tracker may send health and activity data. Together, these devices form a personal area network.
PAN Characteristics
A PAN normally has limited range and supports a relatively small number of devices. It is designed for convenience rather than large-scale communication.
The performance of a PAN may be affected by distance, interference, battery levels, pairing problems, and device compatibility.
Common PAN troubleshooting tasks include verifying that Bluetooth is enabled, confirming that devices are in pairing mode, removing an old pairing, checking battery levels, and moving the devices closer together.
Local Area Network
A local area network, or LAN, connects devices within a limited geographic area. A LAN may cover a home, office, classroom, building, or small group of nearby buildings.
LANs commonly use Ethernet cabling, switches, routers, and network interface cards. Devices on a LAN can communicate with each other and share resources such as printers, files, applications, and internet access.
Examples of LANs include:
A home network connecting desktop computers and a printer
A computer lab connected through an Ethernet switch
An office network connecting employees to file servers
A retail store connecting registers, inventory systems, and printers
A small medical office connecting workstations and network equipment
A LAN is normally controlled by the person or organization using it. For example, a business owns or manages the switches, cables, routers, and servers inside its building.
Home LAN Example
A home LAN may include a router, Ethernet switch, desktop computer, gaming console, smart television, network printer, and network-attached storage device.
The desktop computer and gaming console may connect to the router through Ethernet cables. Other devices may connect wirelessly through the router’s built-in access point.
Even though the network contains both wired and wireless devices, all of the devices may still belong to the same local network.
Business LAN Example
A business LAN may contain many computers, printers, servers, switches, access points, security cameras, and Voice over Internet Protocol phones.
Employees may use the LAN to access shared folders, business applications, databases, printers, and the internet. The organization may divide the LAN into smaller logical networks using virtual local area networks.
For example, employee computers, guest devices, security cameras, and VoIP phones may be placed into separate VLANs for performance and security reasons.
LAN Characteristics
A LAN generally offers high-speed communication and relatively low latency because the devices are close together.
Ethernet LANs commonly support speeds measured in hundreds of megabits or multiple gigabits per second. The exact performance depends on the network equipment, cable category, configuration, and connected devices.
Common LAN problems include damaged cables, disconnected switch ports, incorrect IP settings, failing network interface cards, duplicate IP addresses, and unavailable routers or servers.
Wireless Local Area Network
A wireless local area network, or WLAN, is a local area network that uses wireless radio signals instead of requiring every device to use a physical cable.
Wi-Fi is the most common technology used to create a WLAN. Devices connect through a wireless access point, which bridges the wireless devices to the wired network.
Common WLAN devices include:
Laptops
Smartphones
Tablets
Wireless printers
Smart televisions
Security cameras
Wireless access points
Internet of Things devices
A WLAN may exist by itself, but it is commonly part of a larger LAN containing both wired and wireless connections.
Home WLAN Example
A home wireless router often performs several functions. It may act as a router, Ethernet switch, firewall, DHCP server, and wireless access point.
A laptop, smartphone, smart television, and wireless printer may connect to the router using Wi-Fi. A desktop computer may connect to the same router through an Ethernet cable.
The wireless devices are part of the WLAN, while all connected devices together form the broader home LAN.
Business WLAN Example
A business may install multiple wireless access points throughout an office, school, hospital, or warehouse.
The access points may broadcast the same network name so users can move between areas while remaining connected. This movement between wireless access points is called roaming.
A business may also create separate wireless networks for employees, guests, and specialized devices. Each wireless network may use different authentication methods, permissions, and VLAN assignments.
WLAN Characteristics
A WLAN provides mobility and makes it easier to connect devices without installing a cable to every location. However, wireless performance is more affected by environmental conditions than wired Ethernet.
WLAN performance may be affected by:
Distance from the access point
Walls and building materials
Radio-frequency interference
Channel congestion
The number of connected users
Antenna placement
Wireless security settings
The Wi-Fi standards supported by each device
Common WLAN troubleshooting tasks include checking the SSID, verifying the password, measuring signal strength, changing wireless channels, restarting the access point, updating wireless drivers, and checking for interference.
LAN vs. WLAN
A LAN describes a network covering a limited area. A WLAN is a local network that specifically uses wireless communication.
The terms are related but not identical. A business may have one LAN that contains several wired Ethernet segments and multiple WLANs.
Wired LAN connections generally offer more consistent performance, lower interference, and greater physical security. WLAN connections offer greater mobility and easier installation.
Many modern networks use both wired and wireless technologies. Servers, desktop computers, switches, and access points may use wired Ethernet, while laptops and mobile devices connect using Wi-Fi.
Metropolitan Area Network
A metropolitan area network, or MAN, connects networks across a city, large campus, or metropolitan region.
A MAN is larger than a LAN but usually smaller than a WAN.