Introduction internet by abhay

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  • 2. WHAT IS NETWORKING ? •When two devices are connected together and can transverse signals is called NETWORKING.
  • 3. 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.
  • 4. • 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).
  • 5. • 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
  • 6. • In 1995, with the development of windows 95operating system NSF net allowed to access bygeneral public and its named changed to INTERNET.
  • 7. 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.
  • 8. 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.
  • 9. 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
  • 10. 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.
  • 11. 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
  • 12. 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
  • 13. 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.
  • 14. 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
  • 15. 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
  • 16. 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.
  • 17. 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