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Internet

Internet. Hiroshi Toyoizumi Toyoizumi@waseda.jp. Introduction of the Internet. System of Internet What can be done using Internet Merit of Internet Technologies in the Internet Protocol Routing. X. Stand Alone. Computers are used to be standing alone. Connect two machines.

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Internet

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  1. Internet Hiroshi Toyoizumi Toyoizumi@waseda.jp

  2. Introduction of the Internet • System of Internet • What can be done using Internet • Merit of Internet • Technologies in the Internet • Protocol • Routing

  3. X Stand Alone • Computers are used to be standing alone.

  4. Connect two machines • Sharing the information between two machines. • Copying files etc.

  5. Hub Local Area Network (LAN) • Connecting machines.

  6. domain domain Lab. D Company A Agency C domain University B domain Provider E domain The Internet • Connecting LANs globally.

  7. millions of connected computing devices: hosts, end-systems pc’s workstations, servers PDA’s phones, toasters running network apps communication links fiber, copper, radio, satellite routers: forward packets (chunks) of data thru network router workstation server mobile local ISP regional ISP company network What’s the Internet: “nuts and bolts” view

  8. Domain • The name of organization connected to the internet. • waseda.jp Waseda University • waseda.ac.jp • ntt.co.jp NTT • kantei.go.jp Japanese government

  9. Structure of Domain Name • Domain name is consisted by the name, attributes and nationality of organization. • http://www.internic.net/faqs/authoritative-dns.html • What is waseda.ac.jp? • “waseda” is the name of organization, “ac” represents academia, and “jp” means japan. • Nationality • ca:Canadauk:United Kingdomfr:Franceau:Australia etc. • Attributes • co:companygo:governmentne:internet provider • Name • You can name it!

  10. Address • You need address to send a message to the computer on the receiver side. • Use IP address or domain name. • IP address • Handled by computers. • 164.125.25.10 • Consisted by network number and computer number. • Domain name • tractable for human being • computer ----- aoni.waseda.jp • mail ----- toyo@aoni.waseda.jp • URL ----- www.waseda.ac.jp

  11. NTT Waseda Example of address address URL Domain name den.ntt.co.jp (210.173.163.201) www.abc.pref.fukushima.jp ntt.co.jp Fukushima government ルータ address Domain name aoni.waseda.jp (202.225.207.18) pref.fukushima.jp mail address Domain name toyo@aoni.waseda.ac.jp waseda.ac.jp

  12. What you can do using internet • Browsing（ World Wide Web(WWW）） • E-mail • FTP: file transfer • telnet: remote login to other computers • BBS (electric bulletin board) • Chat • Multimedia player (Video, music）

  13. WWW • System to make and look homepages. • Using hyper link. • Browsers • Netscape Navigator • Internet Explorer • Making Home pages • Use HTML (HyperText Markup Language)

  14. WWW(2) • NetscapeNavigator

  15. WWW(3) • Internet Explorer

  16. A Simple HTML Example <html> <head>  <TITLE> A Simple HTML Example </TITLE> </head>     <body>   <H1> HTML is Easy To Learn </H1>         <P>Welcome to the world of HTML. This is the first paragraph. While short it is still a paragraph!</P>      <P>And this is the second paragraph.</P>  <P>This is an example of link. <A HREF="http://www.u-aizu.ac.jp/~toyo">Click it!</A>  </P>  <P>This is also an example of inline image. Can you find where the original is?<BR> <IMG SRC=http://www.waseda.jp/sils/img/ph_title.jpg> </P>  </body>      </html>

  17. Result of the Simple HTML Example

  18. Make your own HTML file • Edit the following sample. • Save it with an appropriate name on your desktop. • Preview your file by your browser. Sample <html> <head>  <TITLE> This is title of your page </TITLE> </head>     <body>   <H1> This the header! </H1>         <P>Welcome to the world of HTML. This is the first paragraph. While short it is still a paragraph!</P>      <P>And this is the second paragraph.</P>  <P>This is an example of link. <A HREF="http://www.u-aizu.ac.jp/~toyo">Click it!</A>  </P>  <P>This is also an example of inline image. Can you find where the original is?<BR> <IMG SRC=http://www.waseda.jp/sils/img/ph_title.jpg> </P>  </body>      </html>

  19. E-mail Outlook

  20. E-mail Outlook

  21. FTP • Transfer (get or put) files via network.

  22. Upload Your HTML • Find your ftp server of waseda net. xxx@aoni.waseda.jp ftp.aoni.waseda.jp • Use a ftp tool named ffftp to connect the server. • Upload the file onto the server. • Check your first home page at www.yyyy.waseda.jp/xxx

  23. telnet • You can access to other computers.

  24. News, BBS • You can discuss a specific topic and sharing information.

  25. Chat • Chat using text (or even voice).

  26. Multimedia Player • Play movies or music on the internet.

  27. Advantages of internet • You can access global information without going there. • You can communicate with people all over the world. • You can do business world wide. • You don’t have to consider the national border. • Distance education and distance medical care. • Reduced cost of transportation.

  28. Quiz Explain what we can do using the following applications. (1)e-mail (2)WWW (3)ftp (4)BBS (5)telnet (6)chat (7)multimedia player

  29. Internet Technology • Protocol • Routing

  30. What is Protocol? • Protocol is the rule for communication. • As you need to follow the traffic rule when you drive a car, you need to follow the rule during communication. • Internet employs a protocol called TCP/IP is mainly used. • IP Rule for controlling path along internet. • TCP Rule for transfer data without error.

  31. Data unit Data unit Application Application Add header Remove header Presentation Presentation Session Session Transport Transport Network Network Data link Data link Physical Physical Communication link Hierarchy Hierarchical Protcol

  32. A Ltd. C office B University What is Routing • You need to decide a path from source to destination in order to transmit your data. router router 1 2 router Routing table

  33. Variation of routing • Routing methods • Static routing • You don’t change the route which is decided at the beginning. • Dynamic routing • Depending on the network condition, the optimal route is automatically found and configured.

  34. Examples of Your Assignments • Blog • RSS • Streaming Service • Instant Message • Podcast • xDSL/Fiber-to-the-home • Peer-to-Peer • Hot Spot • XML • E-commerce/Auction • Wiki • Social Networking Site

  35. Procedure of group work • Research • Select a topic and do research. • Study and discuss the findings. • Preparation of Presentation • Arrange the findings. • Consider the effective ways to show your finding. • Upload the related documents to the Web server.

  36. Midterm Exam Problem(30 min.) • Suppose you are a non-fiction writer. You are asked to write a non-fiction article about Bali-island on an on-line magazine. • Describe how you prepare and write the non-fiction article by using the power of internet. Use the following tools as many as you can and explain how you are going to use it. (1)e-mail (2)WWW (3)ftp (4)BBS (5)telnet (6)chat (7)multimedia player This is just an example of Midterm Exam!

  37. Easy steps to submit your solution • Make a file describing your solution on your PC. You can use anything to describe it, word, power point, plain-text, html… • Name the file with your student ID. For example, w1111111.doc. • Place your file on the shared folder as ordered in the class. Or you can write your solution with pen and paper, and submit it by your own HAND.

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