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Internet

Internet. Concept of protocols. INTERNET. Internet Service Provider (ISP) has connected to the Internet. INTERNET. Telephone line. modem. You need a telephone line and a modem to connect to your ISP and then through ISP to Internet. Connection to ISP.

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Internet

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  1. Internet Concept of protocols

  2. INTERNET Internet Service Provider (ISP) has connected to the Internet

  3. INTERNET Telephone line modem You need a telephone line and a modem to connect to your ISP and then through ISP to Internet

  4. Connection to ISP Information provided by ISP for connection through modem • modem dial-up number • user name • password • ISP’s computer name

  5. Why do you need a modem ?

  6. Modem • At the sender side, it change computer signal (digital) to telephone signal(analog) • Signal is then transmitted through the telephone line • At the receiver side, it can change back telephone signal (analog) to computer signal(digital)

  7. INTERNET Two computers are connected through the Internet by use of modems

  8. How do 2 computers communicate when they are connected through the Internet? They have their protocols to communicate

  9. Hi ! How are you ? I am Computer X Computer X

  10. Hi ! How are you ? I am Computer Y Computer Y

  11. Computer Y ! How can I send messages to you ? Computer X

  12. Computer X ! You can send messages to me by using protocols called TCP/IP . Computer Y

  13. Computer Y ! TCP/IP can divide messages into packets and arrive to you safely What is your IP address? Computer X

  14. Computer X! My IP address is 250.143.035.001 But humans call me compy.com.hk because a group of numbers is difficult to remember for human being. What is your IP address? Computer Y

  15. Computer Y! My IP address is 250.143.075.255 But human calls me compx.com.hk Can I send messages to you now? Computer X

  16. Computer X! Now, you can send your messages according to my IP address Computer Y

  17. Computer Y! Since your IP address is unique, I can send messages to you now Are you ready? Computer X

  18. Computer X! Now, I am ready Computer Y

  19. Computer Y! I am sending now ... Computer X

  20. Protocol • A standard rule governing the communication between 2 computers • For example • TCP (Transmission Control Protocol) • IP (Internet Protocol) • HTTP (Hypertext Transfer Protocol)

  21. Domain Name • Every Internet server has IP address • It consists of 4 octets, which is very precise (e.g. 250.143. 35.1) • But humans have trouble with remembering numbers and they prefer to use meaningful text address (e.g. compy.com.hk)

  22. I want to access the internet resources. What should I need in order to connect the Internet?

  23. You need • ISP • telephone line and a modem • a browser • URL

  24. Terms • Internet Service Provider (ISP) • a company that gives you access to the Internet for a feE • Uniform Resource Locator(URL) • an address that identifies a server, a directory or a specific file such as HTTP URLs orWeb addresses • Browser • a program that lets you view and explore information on the Web such as Internet Explorer or Netscape Communicator

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