Principles of Information Systems, Sixth Edition The Internet, Intranets, and Extranets Chapter 7.

Principles of Information Systems, Sixth Edition

The Internet, Intranets, and Extranets

Chapter 7


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.



• 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.



• 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.


Use and Functioning of the Internet


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


Routing Messages Over the Internet


U.S. Internet Usage


How the Internet Works

• Hosts• Routers forward packets to other networks• Internet Protocol Stack (TCP/IP)

– Internet Protocol (IP)– Transport Control Protocol (TCP)

• Backbones


Uniform Resource Locator (URL)

• http://www.course.com

Hypertext transfer protocol

World Wide Web Domain category

Host Network Name

http://www.course.com/


U.S. Top Level Domain Affiliations


Accessing the Internet

• Connection via a LAN server– Network adapter card– Open Datalink Interface (ODI)– Network Driver Interface Specification (NDIS)


Accessing the Internet


Internet Service Providers (ISPs)

• Provide Internet access to account holders• Monthly fee varies • Some are free


Internet Service Providers (ISPs)


Internet Services


Internet Services


Internet Services


E-mail and Instant Messaging


ICQ


Usenet Newsgroups


Internet Phone and Videoconferencing Services


Other Internet Services


The World Wide Web


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


Interesting Web Sites


Hypertext Markup Language


Google


Popular Search Engines


Java


Java


CVS.com


Intranets and Extranets


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


Intranet


Extranet

• A network that links selected resources of the intranet of a company with its customers, suppliers, or other business partners.


Internet, Intranet, and Extranet Users


Virtual Private Network


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


Push Technology

• Used to send information automatically over the Internet

• Relies on HTTP or Java technology• Drawbacks include:

– Information overload– Volume of data broadcast


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


Net Issues

• Management issues

• Service and speed issues– Routers can become bottlenecks– Connection agreements


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


Cryptography


FedCIRC


The Web in Three Dimensions


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

Principles of Information Systems, Sixth Edition The Internet, Intranets, and Extranets Chapter 7.

Documents

internet slide

edition principles

internet usage slide

internet access

internet connection

edition use

unauthorized internet

free slide