Monday 24 June 2013

What is Network

What is Computer Network?

computer network is a telecommunications network that allows computers to exchange data. The physical connection between networked computing devices is established using either cable media or wireless media. The best-known computer network is the Internet.

Advantages and Disadvantages

Advantage of network
 Sharing of data, files and folder, Resources, Application, internet connection, gaming and chatting etc.
Disadvantage of Network
 Spreading of virus of network, Less Security.

WHAT IS THE REQUIREMENT OF NETWORK?

Two type’s requirement 

Physical  

 Minimum two   Computers, Lan
Card / NIC card cable


Logical

Operating system with NIC Driver
Centralize Devices Hub and Switch  Installed Protocols  



TYPES OF NETWORK: -   LAN – CAN – PAN, MAN, WAN 


LAN Local area Network

A LAN refers to combination of computer Hardware and connects a group of nodes covering small physical areas.
LAN normally does not exceed tens of kilometers in size.
It is entirely contained within a room or floor or Building

 WAN WIDE  AREA NETWORK

 
WAN includes all networks larger than LAN.
Normally, Multiconnection of LAN is called as WAN. A WAN spans a large Physical distance like country
to country.


COMPUTING MODEL

 Computing Models Technologies have been developed because for the required of following
model.

Centralized Computing
 Cms main centre in Andrei > It’s have its subbranch in Mumbai are Thane Dadar Borivali etc.
 Single Tower is known as Terminal.


Distribution Computing
 As the computer industry matured smaller PC were created that allowed individual total control over their own computer.
 This personal computer structure called Distributed computing.
 Instead of centralizing all computers processing into a single mainframe distribution computing use multiple smaller computer to achieve the same processing goal.
 E.g. Department wise Distribution that means structure.
 Server cms head offices in Anderi

Collaborative Computing
 A new model called collaborative computing and also called Cooperative processing is becoming an important trend
 Instead of simply communication data between computing collaborative computing use two or more computer to accomplish the same processing task.
 E.g. Different server is connected or share with each other is called collaborative computing
 Facebook login ID may be Gmail or Yahoo.com so they both have trust relation with each other to access the FB Account.

ELEMENT OF NETWORK


 Server 
 Client
 Peer

 Server are only allowed to provide services
 Clients are only allowed to request services from other
 Peers may do both con-currently
 Peer to Peer Network allow any entity to both request and provide
Server-Client or Server-Centric network
 It involve strictly define role
 By definition a server centric network place restriction upon which entity may make request of services of them.
 Current, most popular personal computer networks are servercentric


Peer to Peer Network / Server-client network 


It required client OS  / It required client and server OS
Each and every computer has same right / Server has high right and decide the permission for
client
No centralized control over share resource / High security
It work with 10 and 15 user /  Client and server support unlimited user
It is known as Workgroup  / It is known as Domain 

To contact
https://www.facebook.com/sagar.dalvi.1806
sagarpdalvi08@gmail.com

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