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Shelly Cashman Series Discovering Computers

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  1. Shelly Cashman SeriesDiscovering Computers The Internet

  2. OBJECTIVES • Describe the Internet and how it works • Describe the World Wide Web • Describe several types of multimedia on the web • Identify tools used in publishing to the WEB • Security on the Internet • How networks are used

  3. WHAT IS THE INTERNET? • Two or more networks that are joined together - may form an inter/intra Net • The Internet • Worldwide group of connected networks that allow public access to information and services • 35+ Million Web Sites http://www.netcraft.com/survey/ • 162+ million host nodes • Estimated 700+ million users • No single organization owns or controls – W3C Click to see Figure 7-2

  4. The Internet

  5. What can you do on the Net?

  6. Internet Services • WWW • FTP • eMail • Telnet • Mailing Lists • Chat Rooms • Newsgroups

  7. HISTORY OF THE INTERNET • Started as a network of four computers at the UCLA, Standford, UC-Santa Barbara, and Univ of Utah in 1969 • Advanced Research Projects Agency (ARPA) – ARPANET • 1982 – 1987 Email • 1986 - NSF used NFSNet BackBone • 1991 – First commercial use • 1995 - private backbone • 2000+ Internet2

  8. HOW THE INTERNET WORKS • Packet switching • Divides data into packets and sends them along the best route available and reassembles the data • TCP/IP (transmission control protocol/Internet protocol) • Service providers (ISP / OSP) • Backbones • Local ISP -> National ISP ->Backbone Click to see Figure 7-4

  9. Local ISP QC Online National ISP AT & T Online Service AOL MSN WSP - Wireless NAP - Network Access Point Major carriers AT&T, MCI, Sprint MAE - Metropolitan Access Point Major Cities Provide interconnection between carriers How Do You Connect?

  10. How do you connect? • Modem - 56KBS • Cable Modem - ~3 MBS • DSL - +1.0 MBS • ISDN - 64KBS • With speed comes costs

  11. INTERNET ADDRESSES • IP (Internet protocol) address • Simple 32 bit number 1000101011000101010 • Dotted Notation for simplicity 192.128.45.6 • Domain name • Geographic region • Company or organization • Computer group • Specific computer • Doman Name Service - DNS Click to see Figure 7-5

  12. Top Level Domain Abbreviations

  13. THE WORLD WIDE WEB (WWW) • Is not the INTERNET • Started in 1991 • Timothy Berners-Lee • Hyperlinks • Collection of hyperlinks is known as the World Wide Web, WWW, W3, or the Web IRS Website Video

  14. THE WORLD WIDE WEB (WWW) • How a Web page works • WEB SERVER – computer running special software • Home Page • Hypertext • Hyperlinks • URL • HTTP://WWW.SPORTSLINE.COM/MLB/INDEX.HTML • protocol domain name path document World Wide Web Hypertext Animation

  15. THE WORLD WIDE WEB (WWW) • Web browser software • Mosaic • Netscape Navigator • Microsoft Internet Explorer Click to see Figure 7-9

  16. THE WORLD WIDE WEB (WWW) • Web browser software • Home page (welcome page) • Uniform Resource Locator (URL) • Hypertext transfer protocol (http://) • History list • Bookmarks

  17. THE WORLD WIDE WEB (WWW) • Searching for information on the Web • Search engines • YAHOO • Alta Vista • DogPile • Web search sites • YAHOO • Magellan Internet Directory www.magellan.excite.com Magellan Internet Directory Video

  18. THE WORLD WIDE WEB (WWW) • Multimedia on the Web • Plug-ins / Helper applications • Acrobat Reader • ShockWave • RealPlayer • Etc... • Java • Applets • ActiveX Click to see Figure 7-11

  19. THE WORLD WIDE WEB (WWW) • Multimedia on the Web • Graphics • GIF - Graphic Interchange Format • PNG - Portable Network Graphics • JPEG - Joint Photographic Expert Group • Animation • Scrolling text • Games Click to see Figure 7-14

  20. THE WORLD WIDE WEB (WWW) • Multimedia on the Web • Audio (MP3, WAV, QuickTime, AVI) • Streaming audio • Internet audio conferencing • Internet telephone service (Internet telephony) • www.diapad.com • Voice compression • Internet voice mail Click to see Figure 7-15a Click to see Figure 7-15b

  21. THE WORLD WIDE WEB (WWW) • Multimedia on the Web • Video • Streaming video • Live videoconferences • MPEG - Motion Picture Experts Group • http://www.keynote.com

  22. THE WORLD WIDE WEB (WWW) • Multimedia on the Web • Virtual reality • VRML (virtual reality modeling language) • Games • http://www.npac.syr.edu/projects/java/magic • Architecture Click to see Figure 7-16a Click to see Figure 7-16b

  23. THE WORLD WIDE WEB (WWW) • WebCasting • Push technology - WEB content automatically sent to your computer • MS Explorer - Channels • Customized • View Off Line

  24. THE WORLD WIDE WEB (WWW) • Ecommerce • B2C - Business to consumer • Is it safe?? • B2B - Business to Business • EDI - Electronic Data Interchange • Digital Cash • Smart cards • Wallets • Digital Certificates • Issued by Certificate of Authority

  25. End of Part 1

  26. WWW - Cookies • Small file stored on you computer by Web Server • Personalize you experience • Track where you go • Target advertising • Can block by using Browser options • View • Internet Options

  27. WEB Site Publishing Steps • Plan • Analyze and Design • What plug-ins will you use • Develop • Publish / Deploy • Maintain

  28. THE WORLD WIDE WEB (WWW) - Publishing • Hypertext markup language (HTML) • Tags • Markups • Saved in a .htm or .html file • Pictures • Digital cameras • Clip Art • Sound • Video Click to see Figure 7-8

  29. <html> <head> <meta HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=windows-1252"> <meta NAME="GENERATOR" CONTENT="Microsoft FrontPage 3.0"> <title>Current Classes</title> <meta NAME="Template" CONTENT="E:\PROGRAM FILES\MICROSOFT OFFICE\OFFICE\html.dot"> <meta name="Microsoft Theme" content="expeditn 101"> <meta name="Microsoft Border" content="none"> </head> <body background="_themes/expeditn/exptextb.jpg" bgcolor="#FFFFCC" text="#000000" link="#666600" vlink="#993300" alink="#CC3300"><!--mstheme--><font face="Book Antiqua, Times New Roman, Times"> <font FACE="Book Antiqua"> <h1 ALIGN="CENTER"><!--mstheme--><font color="#660033">Current Classes<!--mstheme--></font></h1> </font> <p><a HREF="csci120.html"><font FACE="Book Antiqua">CSCI 120 Introduction to Computer Science</font></a></p> <p><a href="COBOL%20220%20Syllabus%20-%20SAU.htm">CSCI 220 COBOL Programming</a></p> <p><a href="csci275%20Visual%20Basic.htm">CSCI 275 Visual Basic Programming</a></p> <p><a href="CSCI450%20Windows%20NT%20Server.htm">CSCI 450 Network Operating Systems - Windows NT Server 4.0</a></p> <p><a href="csci450-_accel.htm">CSCI 450 Network Operating Systems - Windows NT Server 4.0 - Accel</a></p> <p><a HREF="netlinks.htm"><font FACE="Book Antiqua">Networking Links</font></a></p> <font FACE="Book Antiqua"> <p>&nbsp;</p> <p>&nbsp;</p> </font> <p><a href="default.htm">Home</a></p> <!--mstheme--></font></body> </html>

  30. THE WORLD WIDE WEB (WWW) - Publishing • All MS Office products • Front Page • Adobe Page Mill • Web Hosting • Many ISP’s • Web Hosting Services • Registering your site

  31. OTHER INTERNET SERVICES • E-mail • 400+ million messages per day • Mailbox - disk storage usually on a Mail Server • POP - Post Office protocol • SMTP - Simple Mail Transport Protocol • MIME - Multipurpose Internet Mail Extensions • Email Client • Eudora • MS Outlook • Internet mailbox address • Username@domain name • kgrenier@sau.edu Click to see Figure 7-20

  32. OTHER INTERNET SERVICES • FTP (file transfer protocol) • FTP sites and servers • Anonymous FTP • Upload / Download • Archie sites • FTP Programs • WS FTP - GUI based • FTP - Command Line Click to see Figure 7-21a Click to see Figure 7-21b

  33. Other Internet Services • Mailing Lists • Subscribe • List-Serv • Chat Room • Voice • Video • Instant Messaging

  34. OTHER INTERNET SERVICES • Gopher • Menu-driven • Gopher servers • Veronica • Jughead Click to see Figure 7-22a Click to see Figure 7-22b Click to see Figure 7-22c Click to see Figure 7-22d

  35. OTHER INTERNET SERVICES • Telnet • Log into remote computers • Computer acts as a terminal directly connected to the computer • silver.wnmu.edu • user - access Click to see Figure 7-23

  36. OTHER INTERNET SERVICES • Usenet • On line Bulletin Board • Newsreader • Many email clients • Newgroups • Moderator • Post Articles • Threads • Netiquette (network etiquette)

  37. OTHER INTERNET SERVICES • Internet Relay Chat (IRC) • IRC clients • Channels • Channel operators • /list and /join commands Click to see Figure 7-26

  38. NETWORK COMPUTERS • Network computers (NC) for business • Sometimes called Thin Clients • Less memory than PCs • No floppy or hard drive • No CD-ROM • All storage on server • Net PC - Microsoft and Intel • Hard Drive • Network provides all programs Click to see Figure 7-27

  39. NETWORK COMPUTERS • Network computers for home • WEB TV • Information appliance • Set-top box • Remote control device Click to see Figure 7-29

  40. INTRANET SECURITY • Intranets • Extranets • Firewalls • Proxy server • Caching • Filtering Software • Ecommerce • https:\\ • Digital Certificates • Encryption Click to see Figure 7-19

  41. HOW TO CONNECT TO THE INTERNET AND THE WORLD WIDE WEB • Determine how you will obtain access to the Internet • Through school or work • Through an online service • Through an Internet service provider (ISP) Click to see Figure 7-31

  42. HOW TO CONNECT TO THE INTERNET AND THE WORLD WIDE WEB • Determine how you will obtain access to the Internet • Through school or work • Through an online service • Through an Internet service provider (ISP) • Choosing an Internet service provider Choosing an ISP Video

  43. HOW TO CONNECT TO THE INTERNET AND THE WORLD WIDE WEB • Obtain the necessary equipment • Obtain the necessary software • Install the software • Explore the Internet and the World Wide Web