Chapter 11 – Selecting Technologies and Devices for Enterprise.docx
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Department
Information Technology Management
Course
ITM 600
Professor
Robert Hudyma
Semester
Fall

Description
Chapter 11Selecting Technologies and Devices for EnterpriseNetworkdesigncustomerwilldependonbandwidthandqualityofserviceQoSrequirementsthenetworktopologybusinessrequirementsandconstraintsandtechnicalgoalssuchasscalabilityaffordabilityperformanceandavailabilityScalabilityisakeydesigngoalRemoteAccessTechnologiesRemoteaccesstechnologieshavebecomeanimportantingredientofmanyenterprisenetworkdesignsRemoteaccesstechnologiestoprovidenetworkaccesstotelecommutersemployeesinremoteofficesandmobileworkerswhotravelItisimportanttorecognizethelocationandnumberoffullandparttimetelecommutershowextensivelymobileusersaccessthenetworkandthelocationandscopeofremoteofficesRemoteworkersuseapplicationswhichcanbelikeemailwebbrowsingorbandwidthintensiveapplicationslikedownloadingsoftwareInthepastpeopleusedanalogmodemlineoTheyhavehighlatencyandlowspeedsoThehighestspeedavailableforanalogmodemsis56kbpsNowusersneedhighspeedandlowerlatencywhichisthereasonwhyanalogmodemshavebeenreplacedwithsmallofficehomeofficeSOHOrouterstosupportacableorDSLmodemPPPDevelopedbyInternetEngineeringTaskForceIETFItisastandarddatalinkprotocolfortransportingvariousnetworklayerprotocolsacrossserialpointtopointlinksoItcanbeusedtoconnectasingleremoteusertoacentralofficeortoconnectaremoteofficewithmanyuserstoacentralofficePPPisusedwithIntegratedServicesDigitalNetworkISDNanaloglinesdigitalleasedlinesandotherWANtechnologiesPPPprovidesthefollowingservicesoNetworklayerprotocolmultiplexingoLinkconfigurationoLinkqualitytestingoLinkoptionnegotiationoAuthenticationoHeadercompressionoErrordetectionPPPhasfourfunctionallayersoThephysicallayerisbasedonvariousinternationalstandardsforserialcommunicationIncludingEIATIA232CformerlyRS232CEIATIA422formerlyRS422V24andV35oTheencapsulationofnetworklayerdatagramsisbasedonthestandardHighLevelDataLinkControlHDLCprotocoloTheLinkControlProtocolLCPisusedforestablishingconfiguringauthenticatingtestingandterminatingadatalinkconnectionoAfamilyofNetworkControlProtocolsNCPisusedforestablishingandconfiguringvariousnetworklayerprotocolssuchasIPIPXAppleTalkandDECnetMultilink PPP and Multichassis Multilink PPPMultilinkPPPMPPPaddssupportforchannelaggregationtoPPPoChannelaggregationcanbeusedforloadsharingandprovidingextrabandwidthrequirementsoChannelaggregationwaspopularwithISDNlinkoAllows a PC to connect to two analog modemsMPPPensuresthatpacketsarriveinorderatthereceivingdeviceMPPPencapsulatesdatainPPPandassignsasequencenumbertodatagramsMultichassisMPPPisaCiscoIOSSoftwareenhancementtoMPPPthatallowschannelaggregationacrossmultipleremoteaccessserversatacentralsite
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