Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Internet

  • Login to see the comments

Internet

  1. 1. MUKHTAR DESHMUKH10-06-2013
  2. 2. What is the INTERNET?• The Internet is the system which connectscomputer networks. Internet links millions ofcomputers all over the world. It allows yourcomputer to get information stored on othercomputers far away. Computers connect tothe Internet through telephone and cablesystems.• The largest network of networks in theworld.• Uses TCP/IP protocols and packet switching• Runs on any communications substrate.
  3. 3. • The Internet grew out of an experiment in the 1960s by theU.S. Department of Defense. The DoD wanted to create acomputer network that would continue to function in theevent of a disaster, such as a nuclear war. If part of thenetwork was damaged or destroyed, the rest of the systemstill had to work. That network was ARPANET, (AdvancedResearch Projects Agency Network) which linked U.S.scientific and academic researchers. It was the forerunnerof todays Internet.• 1968 - DARPA (Defense Advanced Research Projects Agency)contracts with BBN (Bolt, Beranek & Newman) to createARPAnet• 1974 - TCP specification by Vint CerfWhere did the Internet come from?
  4. 4. • 1984 – On January 1, the Internet with its 1000 hostsconverts en masse to using TCP/IP for its messaging• 1984Domain Name Server (DNS) introduced and number ofhost is 1,000 1986 NSFNET created a high speed backbone(56Kbps) to interconnect supercomputer centers 1987 Number of hosts breaks 10,000 1992 WWW released by CERN (a physics researchinstitute in Switzerland)Number of hosts breaks1,000,000 1995*.com sites exceed *.edu sites 1996 Electronic commerce gets going seriously
  5. 5. • The creation of the Internet solved the following challenges:– Basically inventing digital networking as we know it– Survivability of an infrastructure to send / receive high-speed electronic messages– Reliability of computer messagingCreation of the Internet
  6. 6.  1977: 111 hosts on Internet 1981: 213 hosts 1983: 562 hosts 1984: 1,000 hosts 1986: 5,000 hosts 1987: 10,000 hosts 1989: 100,000 hosts 1992: 1,000,000 hosts 2001: 150 – 175 million hosts 2002: over 200 million hosts By 2010, about 80% of the planet will be on the InternetInternet Growth Trends
  7. 7. • Transport control protocol (TCP)– A protocol that operates at the transport layer and isused in combination with IP by most Internetapplications• Backbone– An Internet high-speed, long distance communicationslinks (like a bus; wire that connects nodes)• Uniform resource locator (URL)– An assigned address on the Internet for each computer– E.g., http://www.yorku.ca/How the internet works
  8. 8. Three Ways to Access the Internet
  9. 9. Access to the Internet• LAN servers• Local servers can provide access to the Internetthrough normal connections (e.g., Ethernet)• Serial line internet protocol (SLIP) andPoint-to-point protocol (PPP)• Communications protocol software that transmitspackets over telephone lines, allowing dial-up accessto the Internet• Connection via an on-line service• Examples are America Online and Microsoft Network.These services usually require sign-up procedures
  10. 10. • The Web physically consists ofyour personal computer, webbrowser software, aconnection to an Internetservice provider, computerscalled servers that host digitaldata, and routers and switchesto direct the flow ofinformation.Net structure
  11. 11. • A web browser is the softwareprogram you use to access theWorld Wide Web, the graphicalportion of the Internet. Thefirst browser, called NCSAMosaic, was developed at theNational Center forSupercomputing Applications inthe early 1990s. The easy-to-use point-and-click interfacehelped popularize the Web.Microsoft Internet Explorer andNetscape Navigator are the twomost popular ones.Web Browser
  12. 12. • World Wide Web is a network of electronic files stored onmillions of computers all around the world. Hypertext linksthese resources together. Uniform Resource Locators orURLs are the addresses used to locate the files. Every URL isunique and identifies one specific file.• example:http://www.mu.ac.inThe home page of Mysore University.Web Addresses
  13. 13. • Every computer that hosts data on the Internet has a uniquenumerical address. For example, the numerical address forthe White House is 198.137.240.100. But since few peoplewant to remember long strings of numbers, the DomainName System (DNS) was invented. DNS, a critical part of theInternets technical infrastructure, correlates a numericaladdress to a word. To access the White House website, youcould type its number into the address box of your webbrowser. But most people prefer to use"www.whitehouse.gov." In this case, the domain name iswhitehouse.gov.Domain Names
  14. 14. Domain AffiliationsDomain AffiliationsArts cultural and entertainment activitiesCom business organizationsEdu educational sitesfirm businesses and firmsgov government sitesinfo information service providersmil military sitesnom individualsnet networking organizationsorg organizationsrec recreational activitiesstore businesses offering goods for purchaseweb entities related to World Wide Web activitiesnet networking organizations
  15. 15. YOUTHANKFor your patience

×