COMPUTER NETWORK ??


Computer is a inter connection of different computer or autonomous computers. when a number of users work together with a single computer
,using their independent terminals to share resources and  information the system is called networking.

WHEN COMPUTER CALLED COMPUTER NETWORKS ??
When the two computers are said to be networked. when there is exchange of information with a process of another devices.
network may be classified by various ways such as the media used in the transmission signal , the communication protocal used to organised the network topology.
the best know computer network is called INTERNET.

PROPERTY OF COMPUTER NETWORK ??

There various property of computer networking but now we can deal with the major property only.

1) facilitation interpersonak communications
this property is very basic and simply may be you used it well in this property people can communication efficiently and easily via email, instant messages
chats rooms telephones, vedio telephones calls and vedio calls conferences.

2)Allows sharing of files ,data and other type ofinformation.
this property is basically deals with the information stored in the other computers on the networks.providing acess to information on shared stored devices
is a important featurs of many networks.

3) allows sharings of networks and computer resources.
this are those property in  which user may acess and use resources by provided by devices on the network,
example printer a documents ,uses computing resources across a network to accomplish tasks.

THE MAIN AIM OF COMPUTER NETWORKS ??
1)to offer more timely interchange of information and data amongs user.
2)to reduces the efforts and cost required to collect and transmit business data and information.
3)to support better performance of task and imporved management control over an organization especially with several remotes location.

WHY COMPUTER NETWORK IS NEEDED??
COMPUTER network helps to users on the networks to share the information and communication.

the important benifites of computer networks is
FILE sharing : networks of computer helps the user to share the information
HARdWARE sharing : user can share devices such as printer ,scanner,CD-rom ect
APPLICATION sharing : application sharing can be shared over the network and this allows to implementes clines.
USER communication : NETWORKS allows userto communicate using email,newsgroups,and vedio conferences ect
NETWORK gaming : lots of game are available which supports multi-user example LIke PUBG,ludo ect.


LOGICAL classification of networking


A network can be divided into two category.

1) Peer-to-Peer
2) Client-server

PEER-TO-PEER
A peer-to-peer network has no dedication server.here a number of work stations and connected together for the perpose of sharing information or devices
the network is the idea for the where there is no need for dedication servers ,like home or small business establishment of shops.
CLINE SERVERS
the cline/servers modle consist of high end servers serving clinents continuous on a network, by providing them with a specific servers upon request.


ADVANTAGES OF COMPUTER NETWORKS

File sharing
Resources sharing
incress storage capacity
flexible handling

DISADVANTAGES OF COMPUTER NETWORKS
Security concern
virus and malware
lack of robustness
lack of independences

TYPES OF NETWORKS

computer networks may be vary in size,complexity graphic sperad.on the bases of this computers networks is of three types.
1) Local area network (LAN).
2) Metropolitan Area network (MAN).
3) Wide Area network (WAN).


Local area network (LAN)



a Local area network (LAN) is the basic bulding block of any computer networks .it can ranges from simple to complex.

ALL computers are connected ON  the LAN can communicated with one another each computer has its own resources but its allowed to acess one another
devices on  the LAN, provided it has the necessary permissions.this allows to share data share required resources.
The characteristics of a lan are its arrangements of nodes the phusical medium used to connect the nodes EG
simple coaxial cable and the communication protocal used to send or resived the data.

FEATURE OF LAN
1) its has a very speed network with high data transfer.
2) It is majorly private own network and one  can uses firewall to provide security.
3) speed data transfer can be range of 4 to 16 MBPS.max 100 mbps.
4) LAN easy to designe and manintain.
5) each statation can be transfer data and resive data.

METROPOLITAN AREA NETWORK (MAN)
 metropolitan area network (MAN) This are those that are connected two or more Local area networks or campus area network together but not extend beyonds
network that are ususally spans city or a larges campus.
a MAN usually interconnection of numbers of local computers (LANs) using high capicity backbone technology, such as fiber optical links,and provided up links
and wide area network (WAN) and the internet.

MANs usually characterized by very high speed optics cableor other digital media.

Feature of MAN
It is widely use for cables ,as a range is 10km and design to operate within city.
it may be wholly owned and operated and operated by a private company or may be services provided by public company such as local telephones company (Telco)


WIDE AREA NETWORK


A wide area network (WAN) is a network is a computer network taht covers a large geographic area such as a city ,country or span even international distance.
A wide area network are those communication channels that are combines may types of media networks such as telephones lines ,cables and air waves ,A
WAN offers use of transmission lines cables facilities provided by common carriers ,such as telephone lines company
This networks is used when the sharing of data to different stations which can either be local or at any other city, state or country.

FEATURE of WAN
WAN operated privately.
1) if is used for the network that span over large distance such as system spanning states.
2) it is not to design and maintain.
3) it operate on the low data rate
4) it cannnot be transmitted on each station rat
5) its operates on the principal of switching.


DIFFERENCE BETWEEN MANs AND WANs


MANs
The next largest network than LANs may be the Metropolitan area network (MANs) MANs usally spans a geographical area that usually encompassed a city
or country area it interconnected various buldings or other facilites with in the citywide area .
For example Linking can be established between two commercial bulding. A more recent use of MAN technology has been the rapid development of cellular phone
system.

WANs
A wide area network (WAN) is one that operates over a vast distance. its nodes may span cities ,states or national boundaries. this network interconnection
computers, LANS,BNs,MANs and other data transmission facilites.typically ,WAN will employ communication circuits such as long distance telephone wires,
microwaves and satallites.