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CHAPTER 7

NETWORKS,

TELECOMMUNICATIONSAND

WIRELESS COMPUTING

McGraw-Hill/Irwin Copyright 2009 by The McGraw-Hill Companies, Inc. All Rights Reserved.


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Chapter Seven Overview

SECTION 7.1 NETWORKS ANDTELECOMMUNICATIONS Network Basics

Architecture

Topology

Protocols

Media

E-Business Networks

SECTION 7.2 WIRELESS COMPUTING Wireless Fidelity

Business Drivers for Wireless Technologies

Advantages of Enterprise Mobility

The Future of Wireless


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SECTION 7.1

NETWORKS AND

TELECOMMUNICATIONS

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LEARNING OUTCOMES

1. Compare LANs, WANs, and MANs

2. List and describe the four componentsthat differentiate networks

3. Compare the two types of networkarchitectures


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LEARNING OUTCOMES

4. Explain topology and the differenttypes found in networks

5. Describe TCP/IP along with its primarypurpose

6. Identify the different media types found

in networks


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NETWORK BASICS

Telecommun icat ion sys tem-enable thetransmission of data over public or privatenetworks

Network-a communications, data

exchange, and resource-sharing systemcreated by linking two or more computersand establishing standards, or protocols, sothat they can work together


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NETWORK BASICS

The three types of networks include:

Local area network (LAN)

Metropolitan area network (MAN) Wide area network (WAN)


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NETWORK BASICS


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NETWORK BASICS

Networks are differentiated by the following:

Architecture - peer-to-peer, client/server

Topology - bus, star, ring, hybrid, wireless Protocols - Ethernet, Transmission Control

Protocol/Internet Protocol (TCP/IP)

Media - coaxial, twisted-pair, fiber-optic


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ARCHITECTURE

There are two primary types ofarchitectures

Peer-to-peer (P2P) network Client/server network


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Peer-to-Peer Networks

Peer-to -peer (P2P)network- anynetwork without a

central file serverand in which allcomputers in the

network haveaccess to the publicfiles located on allother workstations


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Client/Server Networks

Client- a computer that is designed torequest information from a server

Server- a computer that is dedicated toproviding information in response to externalrequests

Client/server netwo rk-model for applicationsin which the bulk of the back-end processingtakes place on a server, while the front-endprocessing is handled by the clients


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Network operat ing sys tem (NOS)- the operating systemthat runs a network, steering information betweencomputers and managing security and users

Packet-switching-occurs when the sending computerdivides a message into a number of efficiently sized unitscalled packets, each of which contains the address of thedestination computer

Router- an intelligent connecting device that examineseach packet of data it receives and then decides which wayto send it onward toward its destination


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Client/Server network


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Worldwide router growth


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TOPOLOGY

Netwo rk topo logy -refers to thegeometric arrangement of the actual

physical organization of the computersand other network devices) in a network Bus

Star

Ring Hybrid

Wireless


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TOPOLOGY


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PROTOCOLS

Protoco l- a standard that specifies theformat of data as well as the rules to be

followed during transmission

Interoperabi l i ty- the capability of two or

more computer systems to share data andresources, even though they are made bydifferent manufacturers


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Ethernet

Ethernet- a physical and data layertechnology for LAN networking


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Transmission Control

Protocol/ Internet Protocol Transm ission Con trol Proto co l /InternetPro toco l (TCP/IP) -provides the technicalfoundation for the public Internet as well asfor large numbers of private network


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Protocol/ Internet Protocol TCP/IP applications

File transfer protocol (FTP)

Simple mail transfer protocol (SMTP) Hypertext transfer protocol (HTTP)

Simple network management Protocol

(SNMP)


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Protocol/ Internet Protocol


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Voice over IP (VoIP)

Voice over IP (VoIP)-uses TCP/IPtechnology to transmit voice calls overlong-distance telephone lines


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MEDIA

Netwo rk t ransm iss ion media-refers tothe various types of media used to carry

the signal between computers Wire media (guided)

Wireless media (unguided)


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Wire Media

Wire media- transmission materialmanufactured so that signals will beconfined to a narrow path and will behavepredictably

Three most commonly used types include:

1. Twisted-pair wiring

2. Coaxial cable

3. Fiber optic (or optical fiber)


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Wire Media


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Wireless Media

Wireless media- natural parts of theEarths environment that can be used as

physical paths to carry electrical signals


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E-BUSINESS NETWORKS


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E-BUSINESS NETWORKS Virtual private network (VPN)

-a way to use the public

telecommunication infrastructure (e.g., Internet) to providesecure access to an organizations network

Valued-added network (VAN)-a private network,provided by a third party, for exchanging information

through a high capacity connection

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OPENING CASE QUESTIONS

The Digital Hospital1. Explain how hospitals are using telecommunication andnetwork technologies to improve their operations

2. Describe the two different types of network architecturesand identify which one Hackensack University MedicalCenter is using

3. Explain TCP/IP and the role it plays in Hackensack

University Medical Centers IT projects

4. Identify a new telecommunication or network product thatHackensack University Medical Center could use to

improve its operations

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SECTION 7.2

WIRELESS

COMPUTING

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LEARNING OUTCOMES

7. Explain how a wireless device helps anorganization conduct business anytime,anywhere, anyplace

8. Describe RFID and how it can be used to helpmake a supply chain more effective

9. List and discuss the key factors inspiring thegrowth of wireless technologies

10. Describe the business benefits associated

with a mobile enterprise

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WIRELESS FIDELITY (WI-FI)

Wireless fidel i ty (w i-f i) a means of linkingcomputers using infrared or radio signals

Common examples of wireless devices include: Cellular phones and pagers

Global positioning systems (GPS)

Cordless computer peripherals

Home-entertainment-system control boxes

Two-way radios

Satellite television

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WIRELESS FIDELITY (WI-FI)

Disruptive wireless technologies

WiMax wireless broadband

Radio frequency identification tags (RFID) Micro hard drives

Apples G5 and AMDs Athlon 64 processors

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The Value of Timely

Information Timeliness is an aspect of information that

depends on the situation

Real-t ime info rmation immediate, up-to-date information

Real-t ime sy stem provides real-timeinformation in response to query requests

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The Value of Timely

Information Real-time systems help organizations

make faster and more effective decisions

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BUSINESS DRIVERS FOR

WIRELESS TECHNOLOGIES Mobile and wireless are often usedsynonymously, but actually denote two

different technologies Mobile technology - means the technology can

travel with the user, but it is not necessarily inreal-time

Wireless technology - gives users a live(Internet) connection via satellite or radiotransmitters

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WIRELESS TECHNOLOGIES Drivers of wireless technology growth

include:

Universal access to information andapplications

The automation of business processes

User convenience, timeliness, and ability toconduct business 24x7

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WIRELESS TECHNOLOGIES

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WIRELESS TECHNOLOGIES Wireless devices changing business

include:

Wireless local area network (wLAN) Cellular phones and pagers

Cordless computer peripherals

Satellite television WiMax wireless broadband

Security sensor

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ADVANTAGES OF

ENTERPRISE MOBILITY

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Bluetooth

Bluetooth anomnidirectional wirelesstechnology that provides

limited-range voice anddata transmission over theunlicensed 2.4-GHzfrequency band, allowing

connections with a widevariety of fixed and portabledevices that normally wouldhave to be cabled together

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Radio Frequency

Identification Radio frequency ident i f icat ion (RFID)- useactive or passive tags in the form of chips orsmart labels that can store unique identifiers

and relay this information to electronic readers

RFID tag- contains a microchip and anantenna, and typically work by transmitting a

serial number via radio waves to an electronicreader, which confirms the identity of a personor object bearing the tag

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RFID

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RFID

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Satellite

Microware transm it ter commonly used totransmit network signals over great distances

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Global Positioning System

Global posi t ioning sys tem (GPS) a devicethat determines current latitude, longitude,speed, and direction of movement

Market for GPS services is at $5 billion withexpectations for the demand to double over the nextfive years

Geog raphic inform ation system (GIS)designed to work with information that can beshown on a map

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THE FUTURE OF WIRELESS

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OPENING CASE QUESTIONS

The Digital Hospital5. Why is real-time information important tohospitals?

6. How is Hackensack University Medical Centerusing wireless technology to improve itsoperations?

7. Identify three wireless technologies that arechanging the way businesses operate andexplain how hospitals can use thesetechnologies to improve their operations

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CLOSING CASE ONE

Tracking Students1. Explain the fundamentals of RFID and

how it is being used to track students

2. Describe the ethical dilemmas involvedwith tracking students with RFID

3. Identify two types of wireless businessopportunities schools could take

advantage of to help improve operations

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CLOSING CASE ONE

Tracking Students4. How could RFID help schools deal with

potential security issues?

5. Develop a Bluetooth, GPS, or satelliteproduct that schools could use to

improve operations

6. Determine a way that schools could use

RFID tags without violating privacy rights

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CLOSING CASE TWO

UPS versus FedEx1. Explain the fundamentals of wireless

fidelity

2. Describe the differences between UPSand FedExs use of wi-fi

3. Identify two types of wireless businessopportunities the companies could use

to gain a competitive advantage

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CLOSING CASE TWO

UPS versus FedEx4. How could RFID could help the

companies deal with potential security

issues?

5. Develop a Bluetooth, GPS, or satellite

product that the parcel delivery businesscould use to improve efficiencies

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CLOSING CASE THREE

Prada1. Would you consider Pradas use of technologycutting-edge? Why or why not?

2. Pradas attempt to use RFID to checkinventory in real time failed because of thestaffs refusal to use the system. What couldPrada have done to make the implementation

of RFID successful?

3. Identify an additional strategic use of RFID forPradas high-tech store

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CLOSING CASE THREE

Prada4. What should Prada do differently when

designing its next store to ensure its

success?

5. Identify a new use of wireless

technology for Pradas next store

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