telecommunication,internet and extranet

8/6/2019 Telecommunication,Internet and Extranet

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Fundamentals of InformationSystems, Second Edition

1

Telecommunications, the Internet,

Intranets, and Extranets

Chapter 4


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2

Principles and Learning Objectives

The effective use of telecommunications andnetworks can turn a company into an agile,powerful, and creative organization, giving it a

long-term competitive advantage.

Define the term telecommunications and identify anddescribe the function of the components of atelecommunications system.

Identify and briefly describe three basic dataprocessing strategies, including their advantages anddisadvantages.


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3


The Internet is like many other technologies - itprovides a wide range of services, some ofwhich are effective and practical for use today;

others are still evolving, and still others will fadeaway from lack of use.

Briefly describe how the Internet works, includingalternatives for connecting to it and the role of Internetservice providers.

Identify and briefly describe common Internetservices.


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4


Originally developed as a document-management system, the World Wide Web is amenu-based system that is easy to use forpersonal and business applications.

Describe the World Wide Web and the way it works,including the use of Web browsers, search engines,Java, and other Web tools.

Define the terms intranet and extranet and discuss

how organizations are using them. Identify several control and management issues

associated with the use of networks.


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5

Elements of a Telecommunications

System


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6

Media Types


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Fundamentals of InformationSystems, Second Edition 7

Common Wiring and Cabling Types


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Common Telecommunications Devices


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Carriers and Services

Common carriers

Switched lines

Digital subscriber lines (DSL)


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Costs, Advantages, and Disadvantages of

Several Line and Service Types


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Networks and Distributed Processing

Computer network - communications media, devices, and software

needed to connect two or more computer systems.

Centralized processing - processing occurs in a single location or

facility.

Decentralized processing - processing devices are placed at

various locations.

Distributed processing - computers are placed at remote locations

but are connected to each other via telecommunications devices.


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Terminal-to-Host Connection


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File Server Connection


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Client/Server Connection


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A Typical LAN


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A Wide Area Network


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Connecting Computing Devices Using a Home

Network


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Communications Software and

Protocols

Communications software - provides a number ofimportant functions in a network

Network operating system - controls the computer

systems and devices on a network and allows them tocommunicate with each other

Network management software - a manager canmonitor the use of individual computers and shared

hardware

Communications protocol - rules and standards thatmake communications possible


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Common Communications Protocols


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Use and Functioning of the

Internet


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U.S. Internet Usage by Age, Gender,

Region, and Income


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Routing Messages Over the Internet


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How the Internet Works

Internet Protocol (IP)

Transport Control Protocol

Uniform Resource Locator


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U.S. Top-Level Domain Affiliations


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Fundamentals of Information

Systems, Second Edition

25

Three Ways to Access the Internet


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A Representative List of Internet Service

Providers


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Internet and

Telecommunications Services


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Common Abbreviations Used in Personal

E-Mail


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Two Approaches to Electronic Data

Interchange


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Public Network and Specialized Services


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The World Wide Web


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The World Wide Web

An Internet service comprising tens of thousands

of independently owned computers that work

together as one.

Home page

Hypermedia

Hypertext markup language (HTML)


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Several Interesting Web Sites


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Sample HTML


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Web Page Providing Java Applets


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Intranets and Extranets


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Intranets and Extranets

Intranet an internal corporate network built usingInternet and WWW standards and products

Extranet - a network that links selected resources of theintranet of a company with its customers, suppliers, orother business partners

Virtual private network - a secure connection between

two points across the Internet

Firewall - a device that sits between your internalnetwork and the outside Internet


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Summary of Internet, Intranet, and

Extranet Users


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Virtual Private Network


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Net Issues


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Privacy and Security

Cookie

Cryptography

Encryption Digital Signature


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Cryptography


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Summary

Networks - used to share hardware, programs,

and databases across the organization.

Internet - transmits data from one computer

(called a host) to another.

The Web - a collection of tens of thousands ofindependently owned computers that work

together as one in an Internet service.

telecommunication,internet and extranet

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