Accessing the Global Database by 4S2F2f

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									     Accessing
the Global Database

   The World Wide Web




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       Topics Outline


The Origin of the Internet (Past)
What is WWW ? (Present)
What Can We Expect? (Future)




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The Origin of the Internet

Where Did the Internet Come From?
What Is the Internet?
Who’s Who in WWW




                                     3
Where Did the Internet Come
          From?
ARPANET of the 60s and 70s (DOD)
NSFNet (Scientific/Academic)
Internet (Global)




                                    4
               Network



LAN              -- e.g., room, school
Over City        -- e.g., school system
Within the US -- e.g., domestic company
Around the World
          -- e.g., international company
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   Local Area Network (LAN)
 What
  – Group of computers that can communicate to one
    another within a limited area
 Why
  – To share resources (files, printers, storage area
  – Intranet
 Where
  – Within Room
  – Within Building
  – Within Campus

                                                        6
      What Is The Internet?
a world-wide collection of networks
TCP/IP (Transmission Control
 Protocol/Internet Protocol)
Services
Internet Address




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           Internet Services
World Wide Web
 – network of Web servers holding hypertext
   pages
Telnet
 – remote computer access
FTP
 – file transfer between remote computers
E-mail
 – electronic correspondence
VOIP (Voice Over Internet Protocol)
 – Telephone over the Internet                8
            About Address
IP Address
  – Numerical label assigned to each device on
    network
  – 131.238.17.1 (www.chaminade.edu)
E-mail Address
 – rmaruyam@chaminade.edu
URL
 – http:/www.chaminade.edu/~cis/103/103sche
   d.html
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                URL
     (uniform resource locator)
http://www.rkmaruyama.net/class/103/
                                103sched.html
----
protocol
       ---
       host name
       ------------------
           domain
                          ----------
                         directory path
                                ------------
                                file name
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   What Is World Wide Web?
World Wide Web
  – System of servers that maintain specially formatted
    documents, which are hyperlinked to other
    documents and files. WWW uses the Internet to
    transmit such documents and files.
Internet
  – Collection of many networks in countries worldwide

Web Page
  – computer file which is publicly available, containing
    text, sound, graphics, and film clips
  – URL (universal resource locator)

Hypertext
  – data file embedded with links to other data sources 11
         Growth of WWW
Internet
  – text-based commands
Hypertext + Internet --> WWW
 – to make scientific data available
 – at CERN, Switzerland (1991)
Graphic Browsers
 – Mosaic (1993)
 – Netscape
 – Internet Explorer
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        Search Engines
A program that searches documents
 for specified keywords and returns a
 list of the documents in the WWW
 where the keywords were found
List of Search Engines
Natural Language Search




                                        13
       Who’s Who in WWW?
Theodor Holm Nelson
 – invented hypertext
Tim Burners-Lee
 – created World Wide Web at CERN, using
   hypertext and Internet
Marc Andressen and Eric Bina
 – created Mosaic
 – Andressen created the Netscape browser
James Gosling
 – invented the Java language
                                            14
   New Internet Applications
 Running Programs
  – using applets
 Team Computing
  – developing documents and software
 E-Commerce
  – Tele-Shopping
  – Banking -- security, privacy are concerns
  – Communications-- text + audio + video; “movies
    on demand”
 Internet Phone

                                                     15
         New Applications

Data distributed on the Web
 – no need for large local storage space
Programs loaded directly from Web sites
 – no machine dependency
“Net Computers”
 – PC designed specifically for Internet use;
   less storage but FAST connection;
   inexpensive
E-Commerce
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    Problems to be Solved

Security
Privacy
Communication Speed
Domain Names
Economic Haves and Have-nots
Technological literates and illiterates
Copyright Laws
Cyber Terrorism
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                 Summary
 Internet connects computers around the world
 WWW is a subset of the Internet
 WWW is a collection of Web servers housing
  hypertext “pages”
 Pages are linked via the Internet
 Networks will change the way computers are
  used
 Problems of Security and Privacy must be
  solved
 Copyright laws need to be updated

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