What is Network? Concept & Types of Computer Networks

Data Communication & Computer Networking NotesCOMPUTER NETWORKS:

Connection between two or more Computers, so that they can communicate with each other.

Types of a network:

Types of network are the following.

  • LAN (Local Area Network)
  • WAN (Wide Area Network)
  • MAN (Metropolitan Area Network)

Local Area Network (LAN):

  • LAN is a network that spans limited physical area.
  • LANs are usually used for sharing printers, hard disk, hardware devices, and software applications (etc.).
  • LAN is a high-speed connection.
  • Used in small office, computers Labs.

 Wide Area Network (WAN):

  • WAN is a Network that spans a large number of areas.
  • It may operate nationwide or worldwide.



  • If a computer shares resources for other to use then it is called a server.
  • Server are often more powerful, more faster, more memory and more disk space than client.


  • When the computer access the resources form other, then we can say that is a client.
  • Clients are usually less powerful, less memory, less speed and less disk space than server.

LAN Card or NIC Card (Network Interface Card):

  • NIC card or LAN cards are used for data communication.
  • LAN cards are used in Local Area Network.


Modem is used to access internet and data communication in WAN.

Types of a network:

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