the internet, intranets, and extranetslibvolume3.xyz/computers/btech/semester8/software...intranet...

MSIS 110: Introduction to Computers; Instructor: S. Mathiyalakan 1

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

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

E-mail and Instant Messaging

Usenet Newsgroups

Internet Phone and Videoconferencing

Services

Other Internet Services

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

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

the internet, intranets, and extranetslibvolume3.xyz/computers/btech/semester8/software...intranet...

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