Principles of Information Systems, Sixth Edition 1 The Internet, Intranets, and Extranets Chapter 7.

Principles of Information Systems, Sixth Edition

1

The Internet, Intranets, and Extranets

Chapter 7


2

Chapter 7 Outline

• Use and Function of the Internet

• Internet servces

• The Worldwide Web

• Intranets and Extranets

• Net Issues


3

Use and Functioning of the Internet


4

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


5

Routing Messages Over the Internet


6

U.S. Internet Usage


7

How the Internet Works

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

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

• Backbones


8

Uniform Resource Locator (URL)

• http://www.course.com/index.html

Hypertext transfer protocol

Domain name (Default) File Name

Note:1. The fourth component is the “Path” which is not shown here.2. http:// is the default protocol

http://www.course.com/

http://www.course.com/


9

U.S. Top Level Domain Affiliations


10

Accessing the Internet

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

(NDIS)


11

Accessing the Internet


12

Internet Service Providers (ISPs)

• Provide Internet access to account holders

• Monthly fee varies • Some are free


13

Internet Service Providers (ISPs)


14

Internet Services


15

Internet Services


16

Internet Services


17

E-mail and Instant Messaging


18

ICQ


19

Usenet Newsgroups


20

Internet Phone and Videoconferencing Services


21

Other Internet Services


22

The World Wide Web


23

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


24

Some Interesting Web Sites


25

Hypertext Markup Language


26

Google


27

Popular Search Engines


28

Java


29

Java


30

CVS.com


31

Intranets and Extranets


32

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

• Only accessible inside an organization.


33

Intranet


34

Extranet

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

• Access is often controlled by using a password and VPN (see slide 36).


35

Internet, Intranet, and Extranet Users


36

Virtual Private Network


37

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


38

Push Technology

• Used to send information automatically over the Internet

• Relies on HTTP or Java technology

• Drawbacks include:– Information overload– Volume of data broadcast


39

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


40

Net Issues• Management issues• Service and speed issues

– Routers can become bottlenecks– Connection agreements

• Privacy– Cookie: text file placed on the hard disk of a

computer system• Fraud• Security with encryption and firewalls

– Digital signatures, Cyphertext, Cryptography• Unauthorized sites


41

Cryptography


42

FedCIRC


43

The Web in Three Dimensions


44

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


45

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, DIFFERENT WAYS TO CONNECT TO IT AND THE ROLE OF INTERNET SERVICE PROVIDERS.

– IDENTIFY & DESCRIBE THE SERVICES ASSOCIATED W/ THE INTERNET.


46


• 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 INCLUDING THE USE OF WEB BROWSERS, SEARCH ENGINES, AND OTHER WEB TOOLS.


47


• 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 THE PROCESS FOR CREATING WEB CONTENT. – DESCRIBE JAVA. 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.


48

End of Chapter 7

Principles of Information Systems, Sixth Edition 1 The Internet, Intranets, and Extranets Chapter 7.

Documents

internet slide

internet services slide

internet usage slide

internet internet servces

free slide

icq slide

google slide

internet access