Types of Computer Networks

Last Updated : 8 Apr, 2026

A computer network is a group of two or more independent computers and devices connected to share data, resources, and services. These connections can be established using wired media or wireless technologies. Types of Computer Networks are classified based on several factors:

  1. Geographical area
  2. Transmission medium
  3. Ownership and access control

Classification Based on Geographical Area

Categorizing computer networks according to the physical distance or area they cover, ranging from small personal spaces to large global regions. Based on geographical area, computer networks are mainly divided into five types:

Network
Network

1. Personal Area Network (PAN)

This connects personal devices within a very short range around a single user.

  • Coverage Range: 1–10 meters
  • Key Technologies: Bluetooth, NFC, Infrared
  • Real-World Example: Smartphone connected to wireless earbuds
  • When It Is Used: For short-range communication between personal devices
PAN
Personal Area Network

2. Local Area Network (LAN)

This connects computers and devices within a limited area such as a home, office, or building.

  • Coverage Range: One room, building, or small campus
  • Key Technologies: Ethernet, Wi-Fi
  • Real-World Example: Home or office Wi-Fi network
  • When It Is Used: For fast and secure communication within a local location
LAN
Local Area Network

3. Campus Area Network (CAN)

A CAN connects multiple LANs within a campus or a group of nearby buildings.

  • Coverage Range: University or corporate campus
  • Key Technologies: Ethernet, Fiber Optics
  • Real-World Example: College or corporate campus network
  • When It Is Used: To interconnect LANs across a campus under one organization
can
Campus Area Network

4. Metropolitan Area Network (MAN) 

A MAN connects multiple networks within a city or metropolitan region.

  • Coverage Range: City or large town
  • Key Technologies: Fiber Optics, Microwave, Metro Ethernet
  • Real-World Example: City-wide ISP network
  • When It Is Used: To provide high-speed connectivity across a city
man
Metropolitan Area Network (MAN)

5. Wide Area Network (WAN)

A WAN connects networks over large geographical areas such as countries or continents.

  • Coverage Range: Country, continent, or global
  • Key Technologies: Leased lines, Satellite links, Internet
  • Real-World Example: The Internet
  • When It Is Used: To enable long-distance and global communication
WAN
Wide Area Network

Classification Based on Transmission Medium

Computer networks can also be classified based on how data is transmitted between devices. Transmission technology refers to the method or medium used to send data signals from one device to another.

1. Broadcast Network

This used a shared communication medium among all connected devices.

  • Data transmitted by one node is received by all other nodes in the network.
  • Each data packet contains a destination address, and only the intended device processes it.
  • Communication follows a one-to-many model.
  • No dedicated physical path exists between sender and receiver.

Examples:

  • Ethernet (bus-based)
  • Wireless LAN (Wi-Fi)

2. Point-to-Point Network

This uses dedicated links between communicating devices.

  • Data is transmitted directly from one node to another.
  • Communication follows a one-to-one model.
  • Data may pass through intermediate devices (routers or switches).
  • Requires routing algorithms to determine the best path.

Examples:

  • Internet
  • Leased line networks
  • Telephone networks

Classification Based on Ownership and Access Control

This classification focuses on administrative control and accessibility, rather than transmission medium, size, or technology. Based on transmission technology, computer networks are mainly divided into three types:

1. Private Network

This type of network is owned and managed by an individual, organization, or institution

  • Access is restricted to authorized users only
  • Requires authentication such as usernames, passwords, VPNs, or access tokens
  • Used mainly for internal communication
  • Offers higher security, privacy, and control

Examples:

  • Corporate intranet
  • Office LAN
  • Private cloud network

2. Public Network

This type of network is owned by service providers or government authorities

  • Accessible to the general public
  • Requires little or no authorization to connect
  • Offers wide accessibility but lower security
  • Usually shared by a large number of users
  • Can operate over both wired and wireless media

Examples:

  • Internet
  • Public Wi-Fi networks
  • Mobile cellular networks

This type of network is combination of private and public networks

  • Some parts of the network are restricted, while others are publicly accessible
  • Allows organizations to maintain internal security while providing external connectivity
  • Common in modern enterprise and cloud-based systems

Examples:

  • Corporate network connected to the Internet
  • Enterprise cloud networks
  • Online banking systems

Internetwork

An internetwork is a collection of two or more independent networks connected together to function as a single logical network.

  • It enables communication between devices across different networks.
  • The Internet itself is the largest example of an internetwork.
  • Consists of multiple networks, not just individual computers.
  • Uses networking devices to interconnect networks
intranet_vs_extranet
Intranet and Extranet

1. Intranet

An intranet is a private network used within an organization. It is accessible only to authorized users such as employees.

  • Owned and controlled by a single organization
  • Access restricted using login credentials
  • Used for internal communication and collaboration
  • Improves information sharing within the organization

Uses

  • Employee portals
  • Internal emails and messaging
  • Sharing company policies and documents
  • Internal applications (HR, payroll, project management)

Examples

  • Corporate internal website
  • University campus portal
  • Government department internal systems

2. Extranet

An extranet is an extension of an intranet that allows limited access to external users. it connects the organization's internal network with trusted outsiders.

  • Partially private network
  • Access provided to partners, vendors, suppliers, or customers
  • Requires authentication and authorization
  • Often implemented using VPN or secure web access

Uses

  • Business-to-business (B2B) communication
  • Supply chain management
  • Customer portals
  • Partner collaboration platforms

Examples

  • Supplier management system
  • Online banking portals
  • Vendor access portals
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