what is computer network and their types ?

  what is network ?

- A network is a group of two or more computer systems, which are connected together. It also consist of a collection of computers, printers, scanner and other devices that are liked together.

Networking has single purpose to share information as fast as possible.

 

The basic types of network-

1) LAN - LAN stands for Local Area Network. It is used to network computers within a limited area like office, school by using the network media.

2) CAN - Campus Area Network is an interconnection of local area networks within limited geographical area. campus network can be additional to the set of wireless connections. connects several buildings to the same network. Example, corporate office campus, university.

3) MAN - MAN means Metropolitan Area Network, which optimized for a larger geographic area than a LAN, ranging from several blocks of buildings to entire city.

4) WAN - WAN is Wide Area Network that is network connection of wide area such as the world. ex.     Internet

5)PAN -PAN is a Personal Area Network which is referred to the interconnection of information technology devices mostly up to 10 meters. These interconnected devices include laptop, computers, mobiles, or other devices. It also known as wireless PAN.

 Broad Network Categories-
1. peer-to-peer networks - P2P networks involve to or more computers pooing individual resources such as disk drive.  Each computer acts as both the client and the server. These computers are directly communicate with the other computers.

2. Client-Server Networks - This involves  multiple client networks which are connected to at least a central server on network where applications are installed. Clients needs access to these server resources, they can access them only from the server. It is easier to upgrade software applications and files because it held on a single server computer. Security is assured in this model of network as the server controls access and permission to the resources.