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Quiz 5 ReviewQuiz 5 Review

Chapter 9,2 and 10Chapter 9,2 and 10

StructureStructure

14 Multiple Choice14 Multiple Choice Chapter 9: 4Chapter 9: 4 Chapter 2: 8Chapter 2: 8 Chapter 10: 2Chapter 10: 2

34 True and False34 True and False Chapter 9: 28Chapter 9: 28 Chapter 2: 6Chapter 2: 6 Chapter 10: 2Chapter 10: 2

Chapter 10Chapter 10

Hierarchy of DataHierarchy of Data CharacterCharacter FieldField RecordRecord FileFile

Access PrivilegesAccess Privileges Read OnlyRead Only Full UpdateFull Update

Chapter 10Chapter 10

Job TitlesJob Titles Database Analyst: Database Analyst:

Focuses on the meaning and usage of dataFocuses on the meaning and usage of data Database Administrator:Database Administrator:

Creates and maintains data dictionaryCreates and maintains data dictionary Manages securityManages security Monitors performanceMonitors performance Checks backup and recovery Checks backup and recovery

Chapter 10Chapter 10

E-Commerce Business ModelsE-Commerce Business Models Business-to-Consumer (B2C)Business-to-Consumer (B2C) Business-to-Business (B2B)Business-to-Business (B2B) Business-to-Employee (B2E)Business-to-Employee (B2E) Consumer-to-Consumer (C2C)Consumer-to-Consumer (C2C)

Chapter 2Chapter 2 Internet: World-wide collection of networks Internet: World-wide collection of networks

that link millions.that link millions. Started with ARPANETStarted with ARPANET

Originally 4 main computersOriginally 4 main computers Before 1995 National Science Foundation (NSF) Before 1995 National Science Foundation (NSF)

financed and controlledfinanced and controlled Basically it is owned by its usersBasically it is owned by its users No ONE governing agent or individualNo ONE governing agent or individual

World Wide Web Consortium (W3C) oversees research World Wide Web Consortium (W3C) oversees research and sets standards and guidelinesand sets standards and guidelines

Chapter 2Chapter 2

Access OptionsAccess Options DialupDialup DSLDSL ISDNISDN Cable ModemCable Modem

ISP: Internet Service ProviderISP: Internet Service Provider IP AddressIP Address

Four groups of numbers separated by a periodFour groups of numbers separated by a period Domain Name is text versionDomain Name is text version

DNS Server translates the domain name into its associated IP DNS Server translates the domain name into its associated IP addressaddress

Chapter 2Chapter 2

PortalPortal Web site that offers a variety of Internet ServicesWeb site that offers a variety of Internet Services Often first page to displayOften first page to display Yahoo, Netscape, MSN....Yahoo, Netscape, MSN....

Chapter 2Chapter 2

MultimediaMultimedia GraphicsGraphics

digital representation of nongraphic informationdigital representation of nongraphic information thumbnail: small version of larger graphicthumbnail: small version of larger graphic FormatsFormats

Jpeg: compresses to reduce size, goal is to reach a balance Jpeg: compresses to reduce size, goal is to reach a balance between image quality and file sizebetween image quality and file size

Gif: compressed, few distinct colorsGif: compressed, few distinct colors Png: improvement over Gif, expected to replacePng: improvement over Gif, expected to replace

AnimationAnimation appearance of motionappearance of motion

Chapter 2Chapter 2

AudioAudio music, speech or soundmusic, speech or sound MP3 – format that reduces file one-tenth of sizeMP3 – format that reduces file one-tenth of size Streaming – transferring data in a continuous even flow. Can listen Streaming – transferring data in a continuous even flow. Can listen

while it is downloadingwhile it is downloading

VideoVideo full-motion images played back at various speedsfull-motion images played back at various speeds MPEG: popular video compression standardMPEG: popular video compression standard

EmailEmail Transmission of messages and files via computer networkTransmission of messages and files via computer network

Chapter 2Chapter 2

NetiquetteNetiquette Code of acceptable behavior users should follow.Code of acceptable behavior users should follow.

In emailIn email Keep messages briefKeep messages brief Avoid Flames (abusive or insulting messages)Avoid Flames (abusive or insulting messages) Be politeBe polite Do not use all capsDo not use all caps Avoid sending spamAvoid sending spam

Chapter 2Chapter 2

Five major steps to web publishingFive major steps to web publishing Plan a web sitePlan a web site Analyze and design a Web siteAnalyze and design a Web site Create a Web siteCreate a Web site

Web Page Authoring Software will speed up setpWeb Page Authoring Software will speed up setp Deploy a Web siteDeploy a Web site

Web hosting service can host your web siteWeb hosting service can host your web site Maintain a Web siteMaintain a Web site

Chapter 9Chapter 9

CommunicationCommunication How two or more computers transfer dataHow two or more computers transfer data

Sending deviceSending device Receiving deviceReceiving device Communication channelCommunication channel

Uses of Computer CommunicationsUses of Computer Communications Internet, email, FTP, newsgroups, chatInternet, email, FTP, newsgroups, chat Internet Telephony (Voice over IP)Internet Telephony (Voice over IP)

talk with others over Internettalk with others over Internet Need Internet Telephone SoftwareNeed Internet Telephone Software

Chapter 9Chapter 9

Uses of Computer CommunicationsUses of Computer Communications Internet PrintingInternet Printing

Print to Printer from IP addressPrint to Printer from IP address Must have necessary softwareMust have necessary software

NetworkNetwork Collection of computers and devices connected Collection of computers and devices connected

togethertogether Facilitate communicationFacilitate communication Share hardware, date, information and softwareShare hardware, date, information and software Transfer fundsTransfer funds

Chapter 9Chapter 9

Types of networksTypes of networks LAN: Local area networkLAN: Local area network MAN: Metropolitan area networkMAN: Metropolitan area network

usually managed by consortium of usersusually managed by consortium of users WAN: Wide area networkWAN: Wide area network

Chapter 9Chapter 9

Network ArchitectureNetwork Architecture Design of computers, devices and mediaDesign of computers, devices and media

Client/ServerClient/Server Server: controls accessServer: controls access Client: rely on server for resourcesClient: rely on server for resources

Peer to PeerPeer to Peer Each peer has equal responsibilityEach peer has equal responsibility Ideal for small businessIdeal for small business

Internet Peer to PeerInternet Peer to Peer Internet network that users connect directly to each otherInternet network that users connect directly to each other Sometimes called a file sharing networkSometimes called a file sharing network

Chapter 9Chapter 9

Network TopographyNetwork Topography Layout of the computers and devices Layout of the computers and devices

Bus NetworkBus Network Single central cableSingle central cable Inexpensive and easy to installInexpensive and easy to install

Ring NetworkRing Network Cable forms a closed loopCable forms a closed loop If device falls all devices following it are also affectedIf device falls all devices following it are also affected

Star NetworkStar Network All nodes connect to a central deviceAll nodes connect to a central device If hub fails entire network is inoperableIf hub fails entire network is inoperable

Chapter 9Chapter 9

Network Communications TechnologiesNetwork Communications Technologies EthernetEthernet

Allows nodes to contend for accessAllows nodes to contend for access Most popular because relatively inexpensive and easy to Most popular because relatively inexpensive and easy to

install and maintaininstall and maintain Fast EthernetFast Ethernet

Newer standard that transfers at 100 MbpsNewer standard that transfers at 100 Mbps Gigabit EthernetGigabit Ethernet

Travels at 1 GbpsTravels at 1 Gbps

Token RingToken Ring Devices share or pass a special signal, token (or ticket)Devices share or pass a special signal, token (or ticket)

Chapter 9Chapter 9

Network Communications TechnologiesNetwork Communications Technologies TCP/IPTCP/IP

Manages transmission by dividing it into packetsManages transmission by dividing it into packets packet switchingpacket switching

breaking message into packets, sending (along with sender breaking message into packets, sending (along with sender info), reassembling data when it gets thereinfo), reassembling data when it gets there

IrDAIrDA Transfer wirelessly via infrared light wavesTransfer wirelessly via infrared light waves

Uses Line of sight transmission (can not obstruct path)Uses Line of sight transmission (can not obstruct path)

Chapter 9Chapter 9 IntranetIntranet

Applying Internet and Web technologies to internal Applying Internet and Web technologies to internal networksnetworks

Communications over Telephone NetworksCommunications over Telephone Networks Nearly entire telephone network uses digital technology, Nearly entire telephone network uses digital technology,

except the final link from local telephone company to your except the final link from local telephone company to your home.home.

Dial-up LinesDial-up Lines Uses one or more analog linesUses one or more analog lines

Dedicated LinesDedicated Lines Can be either analog or digital and provide constant connectionCan be either analog or digital and provide constant connection

ISDN LinesISDN Lines Requires both ends to have ISDN modemsRequires both ends to have ISDN modems

DSLDSL

Chapter 9Chapter 9

Communication DevicesCommunication Devices Dial-up ModemDial-up Modem ISDN and DSL ModemISDN and DSL Modem Cable ModemCable Modem Network CardsNetwork Cards

Ethernet card is most common typeEthernet card is most common type RoutersRouters

Have built-in firewalls for protection Have built-in firewalls for protection

Chapter 9Chapter 9 Communications ChannelCommunications Channel

BandwidthBandwidth amount that can travel over a communications lineamount that can travel over a communications line

Higher the betterHigher the better

LatencyLatency time it takes a signal to travel from one location to anothertime it takes a signal to travel from one location to another

Can be negatively affected by distance, type of transmission and Can be negatively affected by distance, type of transmission and number of nodesnumber of nodes

Transmission mediaTransmission media materials capable of carrying one or more signalsmaterials capable of carrying one or more signals

BroadbandBroadband transmit multiple signals simultaneouslytransmit multiple signals simultaneously

Chapter 9Chapter 9

Physical Transmission MediaPhysical Transmission Media Twisted Pair CableTwisted Pair Cable

Consists of one or more twisted pair wires bundled togetherConsists of one or more twisted pair wires bundled together Most commonly usedMost commonly used

Coaxial CableCoaxial Cable Consists of a single copper wire surrounded by at least three layers.Consists of a single copper wire surrounded by at least three layers. CATV wiring uses coaxial because it can be cabled over longer CATV wiring uses coaxial because it can be cabled over longer

distances than twisted pairdistances than twisted pair

Fiber OpticFiber Optic Consists of dozens or hundreds of thin strands of glass or plastic Consists of dozens or hundreds of thin strands of glass or plastic

that use light to transmit signalthat use light to transmit signal Can carry significantly more signals than wire cablesCan carry significantly more signals than wire cables

Chapter 9Chapter 9

Wireless Transmission MediaWireless Transmission Media InfraredInfrared Broadcast RadioBroadcast Radio

Needs transmitter to send signal and a receiver to accept itNeeds transmitter to send signal and a receiver to accept it

Cellular RadioCellular Radio MicrowavesMicrowaves SatelliteSatellite

Space station that receives microwave signals from an earthbased Space station that receives microwave signals from an earthbased station, amplifies (strengthens) and broadcasts back over a wide station, amplifies (strengthens) and broadcasts back over a wide areaarea

Transmission from satellite to earth based station is downloadTransmission from satellite to earth based station is download