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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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objectives
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
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 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

internet services
Internet Services
  • WWW
  • FTP
  • eMail
  • Telnet
  • Mailing Lists
  • Chat Rooms
  • Newsgroups
history of the internet
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
how the internet works
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

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?
how do you connect10
How do you connect?
  • Modem - 56KBS
  • Cable Modem - ~3 MBS
  • DSL - +1.0 MBS
  • ISDN - 64KBS
  • With speed comes costs
internet addresses
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

the world wide web www
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

the world wide web www14
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

the world wide web www15
THE WORLD WIDE WEB (WWW)
  • Web browser software
    • Mosaic
    • Netscape Navigator
    • Microsoft Internet Explorer

Click to see Figure 7-9

the world wide web www16
THE WORLD WIDE WEB (WWW)
  • Web browser software
    • Home page (welcome page)
    • Uniform Resource Locator (URL)
    • Hypertext transfer protocol (http://)
    • History list
    • Bookmarks
the world wide web www17
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

the world wide web www18
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

the world wide web www19
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

the world wide web www20
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

the world wide web www21
THE WORLD WIDE WEB (WWW)
  • Multimedia on the Web
    • Video
      • Streaming video
      • Live videoconferences
      • MPEG - Motion Picture Experts Group
      • http://www.keynote.com
the world wide web www22
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

the world wide web www23
THE WORLD WIDE WEB (WWW)
  • WebCasting
    • Push technology - WEB content automatically sent to your computer
    • MS Explorer - Channels
    • Customized
    • View Off Line
the world wide web www24
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
www cookies
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
web site publishing steps
WEB Site Publishing Steps
  • Plan
  • Analyze and Design
    • What plug-ins will you use
  • Develop
  • Publish / Deploy
  • Maintain
the world wide web www publishing
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

slide30

<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>

the world wide web www publishing31
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
other internet services
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

other internet services34
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

other internet services35
Other Internet Services
  • Mailing Lists
    • Subscribe
    • List-Serv
  • Chat Room
    • Voice
    • Video
  • Instant Messaging
other internet services36
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

other internet services37
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

other internet services38
OTHER INTERNET SERVICES
  • Usenet
    • On line Bulletin Board
    • Newsreader
      • Many email clients
    • Newgroups
      • Moderator
      • Post Articles
        • Threads
    • Netiquette (network etiquette)
other internet services41
OTHER INTERNET SERVICES
  • Internet Relay Chat (IRC)
    • IRC clients
    • Channels
    • Channel operators
    • /list and /join commands

Click to see Figure 7-26

network computers
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

network computers43
NETWORK COMPUTERS
  • Network computers for home
    • WEB TV
    • Information appliance
    • Set-top box
    • Remote control device

Click to see Figure 7-29

intranet security
INTRANET SECURITY
  • Intranets
  • Extranets
  • Firewalls
    • Proxy server
    • Caching
  • Filtering Software
  • Ecommerce
    • https:\\
    • Digital Certificates
    • Encryption

Click to see Figure 7-19

how to connect to the internet and the world wide web
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

how to connect to the internet and the world wide web46
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

how to connect to the internet and the world wide web47
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