Transcript CGSCH 07 Wiley 2nd ghzk

Introduction to Information
Technology
Chapter 7:
The Internet, Intranets, and
Extranets
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-1
The Internet Today
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The Internet is international, with
users on all continents
Political, cultural, and regulatory
barriers have slowed the rate of
Internet adoption internationally
The vast majority of sites are in
English
The vast majority of content is
generated in the United States
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-2
The Operation of the Internet

Packets of information flow between machines
governed by common rules (protocols):
• Internet protocol (IP)
• Transport control protocol (TCP)
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Internet is a packet-switching network
• Packets travel independently and possibly on different routes
through the Internet
• Packets are reassembled into the message at the receiving
machine.
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-3
Internet Services – W W W
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An application that uses the Internet
transport functions
Based on HTML - standard hypertext
language used in Web
Handles text, hypermedia, graphics,
and sound
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-4
The World Wide Web (continued)
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Home Page - a text and graphical screen
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Web Site - all the pages of a company or
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Hyperlinks - ways to link and navigate around
display; first, introductory page in a web site
individual
the pages on a web site
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Webmaster - the person in charge of a Web site
Uniform Resource Locator (URL) - points
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Hypertext Transport Protocol (HTTP) -
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to the address of a specific resource on the Web
communications standard used to transfer pages
across the WWW portion of the Internet
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-5
Internet Challenges
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New Technologies
• Adopted by vendors more rapidly than users and
customers can implement them
• Web developers cannot assume that users can run
their innovations successfully
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Internet Regulation
• These organizations are not formally charged in
any legal or operational sense with responsibility
for the Internet
• How to control controversial content on the Web?
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-6
Internet Challenges (continued)
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Internet Expansion
• Tremendous Internet traffic growth has strained
some elements of the network
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Slower retrieval times
Unreliable data transmission
Denial of service by overloaded servers
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-7
Internet Challenges (continued)

Internet Privacy - Web sites
collect information with and without
consumers’ knowledge
• Cookie - small data file placed on
users’ hard drives when a site is
first visited. Collects data on pages
visited and content viewed.
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-8
Intranets
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A private network that uses Internet
software and TCP/IP protocols
• Provide employees with easy access to
corporate information
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Examples – policies and procedures
manuals; human resource forms; product
catalogs
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-9
Extranets

An extension of an intranet to selected
outside business partners, such as suppliers,
distributors, and key customers
• Provide business partners with easy access to
corporate information and easy collaboration
Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-10
THE END
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Introduction to Information Technology, 2nd Edition
Turban, Rainer & Potter
© 2003 John Wiley & Sons, Inc.
7-11