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Shelly Cashman Series Discovering Computers

Shelly Cashman Series Discovering Computers. The Internet. 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.

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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

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