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MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 1
The Internet, Intranets, and
Extranets
Chapter 7
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 2
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 3
Principles and Learning Objectives
• Originally developed as a document-
management 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 4
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 5
Use and Functioning of the
Internet
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 6
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 7
Routing Messages Over the Internet
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 8
U.S. Internet Usage
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 9
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 10
Uniform Resource Locator (URL)
• http://www.course.com
Hypertext transfer protocol
World Wide Web Domain category
Host Network Name
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 11
U.S. Top Level Domain Affiliations
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 12
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 13
Accessing the Internet
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 14
Internet Service Providers (ISPs)
• Provide Internet access to account holders
• Monthly fee varies
• Some are free
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 15
Internet Service Providers (ISPs)
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 16
Internet Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 17
Internet Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 18
Internet Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 19
E-mail and Instant Messaging
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 20
ICQ
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 21
Usenet Newsgroups
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 22
Internet Phone and Videoconferencing
Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 23
Other Internet Services
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 24
The World Wide Web
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 25
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 26
Interesting Web Sites
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 27
Hypertext Markup Language
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 28
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 29
Popular Search Engines
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 30
Java
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 31
Java
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 32
CVS.com
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 33
Intranets and Extranets
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 34
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 35
Intranet
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 36
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 37
Internet, Intranet, and Extranet Users
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 38
Virtual Private Network
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 39
Developing Web Content
• Computer must be linked to a Web server
• Need Web browser program
• Add links to home page
• Advertise
• Tools
– Word processors
– HTML editor
– HTML template
– Text editor
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 40
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 41
Business Uses of the Web
• 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 42
Net Issues
• Management issues
• Service and speed issues
– Routers can become bottlenecks
– Connection agreements
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 43
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 44
Cryptography
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 45
FedCIRC
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 46
The Web in Three Dimensions
MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 47
Summary
• Internet - started with ARPANET, a project started by the U.S. Department of Defense (DOD)
• Internet services include:
– 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