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ID:27877807
大小:1.55 MB
页数:45页
时间:2018-12-05
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1、IntroductiontoWirelessNetworksChapter1McGraw-Hill/Irwin©2007TheMcGraw-HillCompanies,AllRightsReservedObjectivesExaminewirelesstechnologyanditsapplicationsAssesswirelessnetworkingtechnologiesReviewwirelessnetworkapplicationsDiscusstheissuesandconstraintsofawirelessnetworkWhyChooseaWi
2、relessLAN?ChooseaWirelessLANWheninstallinganewLANWhenextendinganexistingLANWhenreplacinganexistingwiredLANConsiderationsWhenInstallingaNewLANWiredLANsMaybelessexpensiveMorereliableEasiertomanageandtroubleshootWirelessLANs(WLANs)WheninstallingcableisnotpracticalNetworkistemporaryDyna
3、micphysicalconfigurationExtendingaWiredNetworkToaddadditionalworkstationstothenetworkProvideusersawaytoaccesstheirworkstationawayfromtheirdeskIssueswithWirelessLANsMaterialsusedinconstructionofbuildingmayimpederadiofrequencycommunicationInterferencefromotherRFdevicesShapeoftheareawh
4、erewirelessaccessisdesiredWiredSmallOffice,HomeOfficeAhomenetworkusingasharedInternetconnectionWirelessSmallOffice,HomeOfficeAwirelessLANusingacablemodemorDSLbridgetoconnecttotheInternetWLANConnectedtoWiredNetworkWirelessaccesspointsareoftenusedtoprovideaconnectiontoawirednetworkCos
5、tIssuesAwirelessnetworkeliminatesthecostofcablerunsAwirelessnetworkeliminatesthecostofinstallingthecableAwirelessnetworkprovidesimmediateconnectionanywhereinthewirelessrangeofitsaccesspointsScalabilityScalabilityisthenetwork’sabilitytochangeasneededtomeettheexpandingneedsofanorganiz
6、ationorhomeWirelessnetworksaregenerallymorescalablethanawirednetworkawirelessworkstationonlyneedstobewithintherangeoftheaccesspointInteroperabilityTheInternationalOrganizationforStandardization(ISO)developedtheOpenSystemsInterconnectionReferenceModel(OSI)tohelpensureallmanufacturer’
7、sequipmentwouldbeinteroperable.ThephysicallayerPHYstandardsdefinethemediumThedatalinkMACstandardsdefinehowtocontrolaccesstothemediumPortabilityForsoftware:thecapabilityofasoftwareprogramtorunondifferentoperatingsystemsorhardwaremodelsForhardware:adevice’scapabilitytomovefromonestand
8、ards-basednetworkin
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