shelly cashman series discovering computers

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>&nbsp;</p>

<p>&nbsp;</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 kgrenier@sau.edu

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