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The seminar was about Internet

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Sem

  1. 1. INTERNET M.Revathi H.Nithya D.Hemalatha T.Nithya I MCA
  2. 2. Introduction to Internet
  3. 3. <ul><li>INTERNET </li></ul><ul><li>Any computer can communicate with any other computer in the world , such infrastructure is called internet. </li></ul><ul><li>The diagrammatic representation is, </li></ul>server pc pc pc pc pc pc
  4. 4. <ul><li>COMPONENTS OF INTERNET </li></ul><ul><li>The various components of the internet are listed down. </li></ul><ul><li>PC : Personal Computers . </li></ul><ul><li>MODEM : Modulator is used to convert the digital signals to analog signals.Demodulator is used to convert analog signals into digital signals. </li></ul><ul><li>Telephone connection is needed to work with the internet. </li></ul><ul><li>ISP: Internet is provided by a Internet Service Provider. </li></ul>
  5. 5. Example : ERNET : Education and Research Network. VSNL : Videsh Sanchar Nigam Ltd. SIFY : Satyam Infoway. The ISP server will be accessible for 24 hours and 7 days a week.
  6. 6. <ul><li>The diagrammatic representation </li></ul>Home pc Output to be transmitted 101101 Modulator ISP server Bits received 101101 Demodulator Telephone line from Pc to ISP Connecting a PC to a ISP’s server
  7. 7. <ul><li>TCP/IP PROTOCOL: </li></ul><ul><li>Protocol is nothing but common set of rules. </li></ul><ul><li> All computers connected to the internet communicates with the common set of rules. It is called Transmission Control Protocol/Internet Protocol. </li></ul>
  8. 8. IP ADDRESS The NIU ( Network Interface Unit ) of every computer device which wants to send or receive messages that must have an address. IP address is 4-byte which is equal to 32 bits.It is expressed by dotted decimal format . Example , xxx.xx.xx.xx (0 to 255). www.yahoo.com (string)
  9. 9. Host: Each computer on the internet is called host. www.sify.com Top level domain Examples: .com .org .net .edu
  10. 10. <ul><li>IP PACKET / DATAGRAM </li></ul><ul><li>Data transmission on the internet is done as </li></ul><ul><li>a sequence of packets (a message to be </li></ul><ul><li>transmitted) from home pc to ISP’s server. </li></ul><ul><li>Data is divided into a chunk of bits called </li></ul><ul><li>datagrams or IP packets. </li></ul>Application data 1k bytes of data p1 p2 p3 p4 p5 p6 p7
  11. 11. <ul><li>ROUTER </li></ul><ul><li>When a packet arrives via one of the NIU’s, the router should examine the destination address of the packet and based on it, and send it to the </li></ul><ul><li>appropriate NIU’s. </li></ul><ul><li>Shortest path algorithm is used to determine the path of the packet. </li></ul>
  12. 12. <ul><li>PACKET SWITCHING: </li></ul><ul><li>The method of dividing data to be sent into packets and routing them to destination is called packet switching . </li></ul><ul><li>. </li></ul>
  13. 13. <ul><li>Advantages : </li></ul><ul><li>Provide temporary storage area. </li></ul><ul><li>Fault tolerant </li></ul><ul><li>Error free transmission. </li></ul>
  14. 14. <ul><li>ABOUT BROWSERS </li></ul><ul><li>Browser is a software that allows a computer to search and display information on the internet. </li></ul><ul><li>The widely used browsers : </li></ul><ul><li>NETSCAPE NAVIGATOR </li></ul><ul><li>INTERNET EXPLORER </li></ul>
  15. 15. <ul><li>Applications of Internet: </li></ul><ul><li>E-mail </li></ul><ul><li>Information retrieval </li></ul><ul><li>Video conferencing </li></ul><ul><li>Chatting </li></ul><ul><li>Web commerce </li></ul>
  16. 16. BROWSING SERVICES
  17. 17. INFORMATION BROWSING SERVICE <ul><li>Definition </li></ul><ul><li>One of the most important and </li></ul><ul><li>widely used application using the </li></ul><ul><li>Internet is known as information </li></ul><ul><li>browsing. </li></ul>
  18. 18. <ul><li>EXAMPLES OF BROWSERS : </li></ul><ul><li>MICROSOFT INTERNET EXPLORER was introduced a year later and has become widespread. </li></ul><ul><li>NETSCAPE NAVIGATOR became the dominant Web browser soon after it’s release in 1994. </li></ul>
  19. 19. <ul><li>www: </li></ul><ul><li>A web page in the world wide web is </li></ul><ul><li>accessed by specifying what is called </li></ul><ul><li>Uniform Resource Locator [URL]. </li></ul>
  20. 20. Access protocol Domain name of server which hosts the webpage Path name to access requested item. A typical URL has the form shown below: http://www.xcollege.ernet.in/ydept/admissions.html
  21. 21. <ul><li>SEARCH ENGINE BASED RETRIEVAL </li></ul><ul><li>Currently, the most popular method of </li></ul><ul><li>retrieving documents from the world wide </li></ul><ul><li>web is to use what are known as search engines. </li></ul>
  22. 22. Examples search engines : www.Google.com www.Altavista.com www.yahoo.com
  23. 23. <ul><li>Google allows search queries using phrases, i.e., combination of words. </li></ul><ul><li>Create bookmarks of useful sites so that you can use them later if you need them. </li></ul>
  24. 27. <ul><li>Features of www </li></ul><ul><li>Audio on the internet: </li></ul><ul><li>In order to send audio from one computer to another computer connected on the network, we need the following: </li></ul><ul><li>Sound cards on both the computers. </li></ul><ul><li>Microphones and loudspeakers. </li></ul><ul><li>If you want to send/receive MP3 compressed audio, you need software for compression/decompression. </li></ul>
  25. 28. <ul><li>Voice mail : </li></ul><ul><li>Email consists of sending and receiving text using the internet. </li></ul><ul><li>Voice mail is sending and receiving audio messages between a sender and a receiver. </li></ul><ul><li>Voice mail is a simple extension of email. </li></ul><ul><li>The only extra facility needed are sound card, loudspeakers, microphones . </li></ul>
  26. 29. <ul><li>INTERNET RADIO : </li></ul><ul><li>There are radio stations which broadcast music, news, etc… on the internet, particularly in USA. </li></ul>
  27. 30. E-Mail
  28. 31. <ul><li>E-Mail </li></ul><ul><li>It is method of sending and receiving </li></ul><ul><li>message using computer on a network. </li></ul><ul><li>A computer, modem, network connection </li></ul><ul><li>&email address is needed for using e-mail. </li></ul>
  29. 32. E-mail address (Format) :Example [email_address] User name Domain name There are several websites provide free mail services Example: www.yahoo.com www.rediffmail.com www.sify.com www.hotmail.com
  30. 57. WEB COMMERCE
  31. 58. <ul><li>Definition </li></ul><ul><li>Types of Commercial Web Sites </li></ul><ul><li>Selling via Secure Servers </li></ul><ul><li>Selecting a Secure Hosting Service </li></ul>WEB COMMERCE
  32. 59. <ul><li>Shopping cart Software </li></ul><ul><li>Interacting with U’r customers </li></ul><ul><li>E-Mail </li></ul>
  33. 60. <ul><li>Definition </li></ul>Web Commerce is nothing but Business through website
  34. 61. <ul><li>PR Sites </li></ul><ul><li>Marketing Sites </li></ul><ul><li>Sales Sites </li></ul>Types of Commercial Web Sites
  35. 62. PR Sites Public Relation The goal of PR website is to know the business’ best qualities known to anyone who visits the site. <ul><li>New product announcement, </li></ul><ul><li>price changes, </li></ul><ul><li>expansion of the business, </li></ul><ul><li>website redesign. </li></ul>
  36. 63. Marketing Sites <ul><li>A marketing site goes beyond the basic internet presence of a PR site. </li></ul><ul><li>Provides detailed information about the product & services, comparing to those of other companies, & listing prices. </li></ul>
  37. 64. Web presentation for a product <ul><li>Describe product’s attributes & advantages. </li></ul><ul><li>List out the features & benefits. </li></ul><ul><li>Compare u’r product with the competitors in terms of features, price, performance, warranties… </li></ul>
  38. 65. Sales Sites Allows the visitor to purchase the goods Alpha software,at http://www.onlinemerchant.com IMSI,at http://www.imisoft.com Multiactive Technologies, at http://www.acbuilder.com
  39. 66. Thank You

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