Transcript ppt
Internet Hiroshi Toyoizumi [email protected] 1 Introduction of the Internet • • • • System of Internet What can be done using Internet Merit of Internet Technologies in the Internet Protocol Routing 2 Stand Alone • Computers are used to be standing alone. X 3 Connect two machines • Sharing the information between two machines. Copying files etc. 4 Local Area Network (LAN) • Connecting machines. Hub 5 The Internet domain • Connecting LANs globally. domain Company A Lab. D Agency C domain University B domain domain Provider E 6 What’s the Internet: “nuts and bolts” view • millions of connected computing devices: hosts, end-systems pc’s workstations, servers PDA’s phones, toasters router server workstation mobile local ISP running network apps • communication links regional ISP fiber, copper, radio, satellite • routers: forward packets (chunks) of data thru network company network 7 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 8 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:Canada uk:United Kingdom fr:France au:Australia etc. Attributes co:company go:government ne:internet provider Name You can name it! 9 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 [email protected] URL ----www.waseda.ac.jp 10 Example of address Domain name NTT ntt.co.jp address den.ntt.co.jp (210.173.163.201) URL www.abc.pref.fukushima.jp Fukushima government ルータ Waseda Domain name waseda.ac.jp address Domain name aoni.waseda.jp pref.fukushima.jp (202.225.207.18) mail address [email protected] 11 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） 12 WWW •System to make and look homepages. •Using hyper link. •Browsers Netscape Navigator Internet Explorer •Making Home pages Use HTML (Hyper Text Markup Language) 13 WWW(2) • Netscape Navigator 14 WWW(3) • Internet Explorer 15 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> 16 Result of the Simple HTML Example QuickTimeý Dz TIFFÅiLZWÅj êLí£ÉvÉçÉOÉâÉÄ ÅB ǙDZÇÃÉsÉNÉ`ÉÉǾå©ÇÈǞǽDžÇÕïKóvÇÇ• 17 Make your own HTML file 1. 2. 3. 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> 18 E-mail Outlook 19 E-mail Outlook 20 FTP • Transfer (get or put) files via network. QuickTimeý Dz TIFFÅià• èkǻǵÅj êLí£ÉvÉçÉOÉâÉÄ Ç™Ç±ÇÃÉsÉNÉ`ÉÉǾå©ÇÈǞǽDžÇÕïKóvÇÇ• ÅB 21 Upload Your HTML 1. Find your ftp server of waseda net. [email protected] ftp.aoni.waseda.jp 2. Use a ftp tool named ffftp to connect the server. 3. Upload the file onto the server. 4. Check your first home page at www.yyyy.waseda.jp/xxx 22 telnet • You can access to other computers. 23 News, BBS • You can discuss a specific topic and sharing information. 24 Chat • Chat using text (or even voice). 25 Multimedia Player • Play movies or music on the internet. 26 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. 27 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 28 Internet Technology • Protocol • Routing 29 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 TCP Rule for controlling path along internet. Rule for transfer data without error. 30 Hierarchy Hierarchical Protcol Data unit Application Presentation Data unit Add header Remove header Application Presentation Session Session Transport Transport Network Data link Network Data link Physical Physical Communication link 31 What is Routing • You need to decide a path from source to destination in order to transmit your data. router router C office 1 A Ltd. 2 router Routing table destination C office B university B University Port # 1 2 32 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. 33 Examples of Your Assignments 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 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 34 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. 35 Midterm Exam Problem (30 min.) • Suppose you are a non-fiction writer. You are asked to write a nonfiction 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 (5)telnet (2)WWW (3)ftp (6)chat (4)BBS (7)multimedia player This is just an example of Midterm Exam! 36 Easy steps to submit your solution 1. Make a file describing your solution on your PC. You can use anything to describe it, word, power point, plain-text, html… 2. Name the file with your student ID. For example, w1111111.doc. 3. 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. 37