WHAT IS NETWORKING ? •When two devices are connected together and can transverse signals is called NETWORKING.
WHAT IS COMPUTER NET WORK?• When two or more computer connected together and can share data as well as resources is called COMPUTER NETWORK. •• Internet is a global network of computer networks that can exchange all type of data and informations through out the world.
• The seeds of internet were planted in 1969 by U.S department of defense that’s why it named ARPANET (ADVANCE RESEARCH PROJECTS AGENCY NETWORK).
• The main purpose of ARPANET was to connect different universities of U.S and U.S department of defence to communicate different development of U.S army. ARPANET wasn’t allow for general people
• In 1995, with the development of windows 95operating system NSF net allowed to access bygeneral public and its named changed to INTERNET.
Internet is a network of networks it meanssmaller network connect with internet backbone through gateways. GATEWAY:- Gateway is a device that connects two dissimilar network. BACKBONE:-Backbone is a interconnectionstructure that connects one or more networks.
1. At the source computer the message or filedocument to be sent to another computer isfirstly divided in to very small parts called PACKETS. A packet generally contains up to 1500 characters. . Each packet is given a number serial wise e.g..1, 2,3.
3.All these packets are then sent to the address of destination computer. 4.The destination computer receives thepackets in random manner.(It may even receivepacket 10 before packet 1 arrives).If a packet is garbled or lost, it is demanded again.5.The packets are reassembled in the order of their number and the original messagefiledocument is obtained
ADVANTAGES1.Best communication medium.2.Greater access to information that reduceresearch time3.Any type of data can transfer using internet.4.Increase in business due to e-commerce.
1.Cyber frauds has increase that involves misuse of debit/ credit cards.2.Internet is the greatest source of computer viruses.3.The information which we download fro the net may be in relevant
1.Dial- up connection:-It is a temporaryconnection provided by ISPC(internet serviceprovider). Each machine required MODEM toconnect with the ISP server. The data transferspeed is less in dial- up connection.Broadband connection:-Data transfer in theform of digital signals that is 0 and 1. Thespeed of broadband connection measure inMBPS
Wireless connection:- An internet connectionwithout any wire connectivity is called wirelessconnection. They are of two types:-1.wi-fi:-It is a fidelity. It is a technique in which we canconnect our laptops on the internet in a limited andspecific area wire help of an a login and a password.2.wi-max:- It is a wireless digital communicationsystem that works up to 30miles means with in a city.
It is a set of program ,standards and protocolsthat helps to access internet world wide.The attributes of WWW :-1. Its user friendly2. Multimedia supported3. Hypertext and hyperlink supported4. interactive
It is a set of programs, use to navigatedifferent websites. They are of two types:- 1. Graphical :- graphical web browser support text, audio, video and images.2.Text web browser:- These web browser can access only text data. e.g.:-LYNX
It is a program that runs on a computer andprovide internet connections.Its major functions are:-1.Serfing web pages2.Accessing gateway3.Controling the server4.Maintaining the statistics of the internetaccess.
The hypertext data that supported by internetis called webpages and connection ofwebpages is called websites . A completeunique websites address which works underhttp: is called URL. The different types of URLare as follow:- com-commercial, .edu-education, .org-non-profit, .NET- It providenetwork resources, .Gov-government.Ex- country codes – for INDIA is in