What is computer network? Write classification of networks with illustration.

A computer network is a group of interconnected computers that communicate and share resources like data, applications, and hardware devices. Networking allows efficient data exchange, resource sharing, and communication between multiple devices.

Classification of Networks:

1. Based on Geographical Area:

   • Local Area Network (LAN): Covers a small area like a single building or campus. Example: Office network.
   • Metropolitan Area Network (MAN): Spans a city or large campus. Example: Citywide Wi-Fi.
   • Wide Area Network (WAN): Covers large geographical areas, often a country or continent. Example: The internet.

2. Based on Topology:

   • Bus Topology: All devices share a single communication line.
   • Star Topology: All devices connect to a central hub.
   • Ring Topology: Each device is connected to two others, forming a ring.

Illustration:

• LAN:

  [PC]---[Switch]---[PC]
            |
          [Printer]
  

• WAN:

  [Office LAN]---[ISP]---[Office LAN]
      |                      |
   [Router]              [Router]
  

These classifications help in designing networks tailored to specific needs, ensuring optimal performance and coverage.