The Internet, Intranets, and
Extranets
Chapter 7
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Principles and Learning Objectives
• The Internet is like many other technologies—it
provides a wide range of services, some of
which are effective and practical for use today,
others are still evolving, and still others will fade
away from lack of use.
– Briefly describe how the Internet works, including
alternatives for connecting to it and the role of Internet
service providers.
– Identify and briefly describe the services associated
with the Internet.
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Principles and Learning Objectives
• Originally developed as a documentmanagement system, the World Wide Web is a
menu-based system that is easy to use for
personal and business applications.
– Describe the World Wide Web and how it works.
– Explain the use of Web browsers, search engines,
and other Web tools.
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Principles and Learning Objectives
• Before the Internet and the World Wide Web become
universally used and accepted for business use,
management issues; service and speed issues; and
fraud, security, and unauthorized Internet sites must be
addressed and solved.
– Identify who is using the Web to conduct business and discuss
some of the pros and cons of Web shopping.
– Outline a process for creating Web content.
– Describe Java and discuss its potential impact on the software
world.
– Define the terms intranet and extranet and discuss how
organizations are using them.
– Identify several issues associated with the use of networks.
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Use and Functioning of the
Internet
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Use and Functioning of the Internet
•
•
•
•
ARPANET
Internet Protocol (IP)
Wireless Internet
Research for a faster Internet
– Internet2 (I2)
– Next Generation Internet (NGI)
– Corporate efforts
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Routing Messages Over the Internet
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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U.S. Internet Usage
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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How the Internet Works
• Hosts
• Routers forward packets to other networks
• Internet Protocol Stack (TCP/IP)
– Internet Protocol (IP)
– Transport Control Protocol (TCP)
• Backbones
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Uniform Resource Locator (URL)
• http://www.course.com
World Wide Web
Hypertext
transfer protocol
Domain category
Host Network Name
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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U.S. Top Level Domain Affiliations
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Accessing the Internet
• Connection via a LAN server
– Network adapter card
– Open Datalink Interface (ODI)
– Network Driver Interface Specification (NDIS)
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Accessing the Internet
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Internet Service Providers (ISPs)
• Provide Internet access to account holders
• Monthly fee varies
• Some are free
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Internet Service Providers (ISPs)
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Internet Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Internet Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Internet Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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E-mail and Instant Messaging
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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ICQ
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Usenet Newsgroups
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Internet Phone and Videoconferencing
Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Other Internet Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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The World Wide Web
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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The World Wide Web
•
•
•
•
•
•
Menu-based system that uses client/server model
Hypermedia
HTML, XML
Web browsers
Java
Search engines
– Keyword indexes: fast & broad
– Subject indexes: focused searches
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Interesting Web Sites
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Hypertext Markup Language
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Google
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Popular Search Engines
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Java
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Java
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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CVS.com
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Intranets and Extranets
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Intranet
• Internal corporate network built using Internet
and World Wide Web standards and products
• Slashes the need for paper
• Provides employees with an easy and intuitive
approach to access information that was
previously difficult to obtain
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Intranet
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Extranet
• A network that links selected resources of the
intranet of a company with its customers,
suppliers, or other business partners.
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Internet, Intranet, and Extranet Users
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Virtual Private Network
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Developing Web Content
•
•
•
•
•
Computer must be linked to a Web server
Need Web browser program
Add links to home page
Advertise
Tools
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–
–
–
Word processors
HTML editor
HTML template
Text editor
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Push Technology
• Used to send information automatically over the
Internet
• Relies on HTTP or Java technology
• Drawbacks include:
– Information overload
– Volume of data broadcast
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Business Uses of the Web
•
•
•
•
E-mail
Linking buyers and sellers
Tool for marketing, sales, and customer support
Low-cost alternative to fax or express mail
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Net Issues
• Management issues
• Service and speed issues
– Routers can become bottlenecks
– Connection agreements
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Net Issues
• Privacy
– Cookie: text file placed on the hard disk of a computer system
• Fraud
• Security with encryption and firewalls
– Digital signature
– Cyphertext
– Cryptography
• Unauthorized sites
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Cryptography
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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FedCIRC
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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The Web in Three Dimensions
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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Summary
• Internet - started with ARPANET, a project started by the
U.S. Department of Defense (DOD)
• Internet services include:
– E-mail
– Telnet
– FTP
– Usenet and newsgroups
– Chat rooms
• Web site - like a magazine, with a cover page called a
home page that has graphics, titles, black and
highlighted text
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan
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