CBSE Class 11 & 12 Computer Science and Informatics Practices Python Materials, Video Lecture

Computer Network LAN, MAN, WAN

computer network


What is a Computer Network?

When two or more autonomous computing devices connected to one another in order to exchange information or share resources, form a Computer Network. 

Computer Network

Components of Computer Network -:

  1. Maj                
  2. Network-Hardware
  3. Communication Chanel
  4. Software
  5. Network Services
  6. Host
  7. Servers
  8. Client

Types of Computer Network -:

A computer network can be categorized by its size:
  • PAN (Personal Area Network)
  • LAN (Local Area Network)
  • MAN (Metropolitan Area Network)
  • WAN (Wide Area Network)

PAN (Personal Area Network) -:

Personal Area Network is a network arranged within an individual person, typically within a range of 10 meters (30 feet).
Types of Personal Area Network (PAN) :
  • Wireless PAN – Wireless Personal Area Network (WPAN) is connected through signals such as infrared, ZigBee, Bluetooth and ultra-wideband, etc.
  • Wired PAN – Wired PAN is connected through cables/wires such as Firewire or USB (Universal Serial Bus).

LAN  (Local Area Network)-:

  • Local Area Network is a group of computers connected to each other in a small area such as a building, office.
  • It covers an area of a few kilometer radius (approx. 1-10 km).
  • It is managed by a single person / Organization. 

MAN (Metropolitan Area Network)-:

  • A metropolitan area network is a network that covers a larger geographic area by interconnecting a different LAN to form a larger network e.g. within a city.
  • Covers an area of few kilometers to a few hundred kilometers.
  • Owned by Organization or Government.
  • The network of schools, banks, government offices within a city are examples of MAN.

WAN (Wide Area Network)-:

  • A Wide Area Network is a network that extends over a large geographical area or countries.
  • Covers over hundreds of kilometer radius.
  • It is usually formed by interconnecting LANs, MANs, or maybe other WANs.
  • Network of ATMs, BANKs, National or International organization offices spread a country, the continent is examples of WAN.
  • The internet is one of the biggest WAN in the world.

Computer Network-:


  • Resource Sharing
  •  Cost Reduction
  •  Collaborative User Interaction
  •  Share Storage
  •  Fast Communication


  • Security Concerns
  •  Lack of Robustness
  •  Needs an Efficient Handler
  •  Lack of Independence
  •  It requires an expensive set-up.

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