shelly cashman series discovering computers
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Shelly Cashman SeriesShelly Cashman Series
Discovering ComputersDiscovering Computers
The Internet
OBJECTIVESOBJECTIVESOBJECTIVESOBJECTIVES
Describe the Internet and how it worksDescribe the World Wide WebDescribe several types of multimedia
on the webIdentify tools used in publishing to the
WEBSecurity on the InternetHow networks are used
WHAT IS THE INTERNET?WHAT IS THE INTERNET?WHAT IS THE INTERNET?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 services35+ Million Web Sites
http://www.netcraft.com/survey/ 162+ million host nodesEstimated 700+ million usersNo single organization owns or controls – W3C
Click to see Figure 7-2Click to see Figure 7-2
The Internet
What can you do on the Net?
Internet Services
WWWFTPeMailTelnetMailing ListsChat RoomsNewsgroups
HISTORY OF THE INTERNETHISTORY OF THE INTERNETHISTORY OF THE INTERNETHISTORY 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 Email1986 - NSF used NFSNet BackBone1991 – First commercial use1995 - private backbone2000+ Internet2
HOW THE INTERNET WORKSHOW THE INTERNET WORKSHOW THE INTERNET WORKSHOW 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)BackbonesLocal ISP -> National ISP ->Backbone
Click to see Figure 7-4Click to see Figure 7-4
How Do You Connect?
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?
Modem - 56KBSCable Modem - ~3 MBSDSL - +1.0 MBSISDN - 64KBS
With speed comes costs
INTERNET ADDRESSESINTERNET ADDRESSESINTERNET ADDRESSESINTERNET 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 7-5Click to see Figure 7-5
Top Level Domain Abbreviations
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
Is not the INTERNETStarted in 1991Timothy Berners-LeeHyperlinksCollection of hyperlinks is known as
the World Wide Web, WWW, W3, or the Web
IRS Website VideoIRS Website Video
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(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 AnimationWorld Wide Web Hypertext Animation
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
Web browser software Mosaic Netscape Navigator Microsoft Internet Explorer
Click to see Figure 7-9Click to see Figure 7-9
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
Web browser software Home page (welcome page) Uniform Resource Locator (URL) Hypertext transfer protocol (http://) History list Bookmarks
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
Searching for information on the Web Search engines
YAHOOAlta Vista DogPile
Web search sitesYAHOOMagellan Internet Directory
www.magellan.excite.com
Magellan Internet Directory VideoMagellan Internet Directory Video
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
Multimedia on the Web Plug-ins / Helper applications
Acrobat ReaderShockWaveRealPlayerEtc...
JavaApplets
ActiveX
Click to see Figure 7-11Click to see Figure 7-11
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
Multimedia on the Web Graphics
GIF - Graphic Interchange FormatPNG - Portable Network GraphicsJPEG - Joint Photographic Expert Group
AnimationScrolling textGames
Click to see Figure 7-14Click to see Figure 7-14
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
Multimedia on the Web Audio (MP3, WAV, QuickTime, AVI)
Streaming audioInternet audio conferencingInternet telephone service (Internet
telephony)• www.diapad.com
– Voice compression
Internet voice mail
Click to see Figure 7-15bClick to see Figure 7-15b
Click to see Figure 7-15aClick to see Figure 7-15a
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
Multimedia on the Web Video
Streaming videoLive videoconferencesMPEG - Motion Picture Experts Grouphttp://www.keynote.com
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(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 7-16bClick to see Figure 7-16b
Click to see Figure 7-16aClick to see Figure 7-16a
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
WebCasting Push technology - WEB content
automatically sent to your computer MS Explorer - Channels Customized View Off Line
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW)(WWW)
Ecommerce B2C - Business to consumer
Is it safe?? B2B - Business to Business
EDI - Electronic Data Interchange Digital Cash
Smart cardsWallets
Digital CertificatesIssued by Certificate of Authority
End of Part 1
WWW - Cookies
Small file stored on you computer by Web Server
Personalize you experience Track where you goTarget advertisingCan block by using Browser options
ViewInternet Options
WEB Site Publishing Steps
PlanAnalyze and Design
What plug-ins will you useDevelopPublish / DeployMaintain
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW) - Publishing(WWW) - PublishingTHE WORLD WIDE WEB THE WORLD WIDE WEB (WWW) - Publishing(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 7-8Click to see Figure 7-8
<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 ComputerScience</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> </p>
<p> </p></font>
<p><a href="default.htm">Home</a></p><!--mstheme--></font></body></html>
THE WORLD WIDE WEB THE WORLD WIDE WEB (WWW) - Publishing(WWW) - Publishing
All MS Office productsFront PageAdobe Page MillWeb Hosting
Many ISP’s Web Hosting Services Registering your site
OTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER 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 [email protected]
Click to see Figure 7-20Click to see Figure 7-20
OTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICES
FTP (file transfer protocol) FTP sites and servers Anonymous FTP Upload / Download Archie sites FTP Programs
WS FTP - GUI basedFTP - Command Line
Click to see Figure 7-21bClick to see Figure 7-21b
Click to see Figure 7-21aClick to see Figure 7-21a
Other Internet Services
Mailing Lists Subscribe List-Serv
Chat Room Voice Video
Instant Messaging
OTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICES
Gopher Menu-driven Gopher servers Veronica Jughead
Click to see Figure 7-22dClick to see Figure 7-22d
Click to see Figure 7-22bClick to see Figure 7-22b
Click to see Figure 7-22aClick to see Figure 7-22a
Click to see Figure 7-22cClick to see Figure 7-22c
OTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICES
Telnet Log into remote computers Computer acts as a terminal directly
connected to the computersilver.wnmu.eduuser - access
Click to see Figure 7-23Click to see Figure 7-23
OTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICES
Usenet On line Bulletin Board Newsreader
Many email clients
NewgroupsModeratorPost Articles
• Threads
Netiquette (network etiquette)
OTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICESOTHER INTERNET SERVICES
Internet Relay Chat (IRC) IRC clients Channels Channel operators /list and /join commands
Click to see Figure 7-26Click to see Figure 7-26
NETWORK COMPUTERSNETWORK COMPUTERSNETWORK COMPUTERSNETWORK 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 7-27Click to see Figure 7-27
NETWORK COMPUTERSNETWORK COMPUTERSNETWORK COMPUTERSNETWORK COMPUTERS
Network computers for home WEB TV Information appliance Set-top box Remote control device
Click to see Figure 7-29Click to see Figure 7-29
INTRANET SECURITYINTRANET SECURITYINTRANET SECURITYINTRANET SECURITY
Intranets Extranets Firewalls
Proxy server Caching
Filtering Software Ecommerce
https:\\ Digital Certificates Encryption
Click to see Figure 7-19Click to see Figure 7-19
HOW TO CONNECT TO THE INTERNET HOW TO CONNECT TO THE INTERNET AND THE WORLD WIDE WEBAND THE WORLD WIDE WEBHOW TO CONNECT TO THE INTERNET HOW TO CONNECT TO THE INTERNET AND THE WORLD WIDE WEBAND 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 7-31Click to see Figure 7-31
HOW TO CONNECT TO THE INTERNET HOW TO CONNECT TO THE INTERNET AND THE WORLD WIDE WEBAND THE WORLD WIDE WEBHOW TO CONNECT TO THE INTERNET HOW TO CONNECT TO THE INTERNET AND THE WORLD WIDE WEBAND 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 VideoChoosing an ISP Video
HOW TO CONNECT TO THE INTERNET HOW TO CONNECT TO THE INTERNET AND THE WORLD WIDE WEBAND THE WORLD WIDE WEBHOW TO CONNECT TO THE INTERNET HOW TO CONNECT TO THE INTERNET AND THE WORLD WIDE WEBAND THE WORLD WIDE WEB
Obtain the necessary equipmentObtain the necessary softwareInstall the softwareExplore the Internet and the World
Wide Web