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Computer Network

A Collection Of Computer Devices that are connected in various ways in order to communicate or share resources.

Methods

Wired: cables
Wireless: Radio waves, IR waves

Terms

Node/Host: any device on network
Data Transfer rate: speed with which data is moved from one place to another on network

Models

  1. client/server model: provide service
  2. peer to peer model:

Server

  1. File Server: A computer that stores and manage files for multiple users on a network
  2. Web Server: A computer dedicated to responding to requests for web pages

Types of Networks

1. Local Area Network (LAN) or Intranet

Topology:

  • Ring: A config that connects all nodes in a closed loop on which messages travel in one direction.
  • Star: A config that centres around one node to which all others are connected and through which all messages are sent
  • Bus: All nodes are connected to single communication line that carries message in both directions
    Screenshot_2026-05-29_21_23_37.png

2. Wide Area Network(WAN)

-> Connects two or more LAN
* Gateway: one particular node on a LAN setup to handle all communication going between that LAN and other networks.
* Internetworking: communication between networks
* Internet: WAN covering globe

3. Metropolitan Area Network (MAN)

-> communication infra that has been developed in and around large cities

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