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Inthisapproach,thenetworkapplicationsandservicerequirementsareidentified,andthenTop-downnetworkdesignisamethodologyfordesigningnetworks thatbeginsattheupperlayersoftheOSIreferencemodelbeforemovingtothelowerlayers.PartI(IdentifyingYourCustomer'sNeedsandGoals)ofTop-Down NetworkDesignpresentssomecheckliststhatyoucanusewhilegatheringinformationtohelpyoudevelopanetworkdesignInadditiontocoveringhierar-chical networkdesign,thechapteralsocoversredundantnetworkdesigntopologiesandonapplications,sessions,anddatatransportbeforetheselectionofrouters, switches,andmediathatoperateatthelowerlayersUsingaTop-DownNetworkDesignMethodologyUsingaStructuredNetworkDesignProcessSystems DevelopmentLifeCyclesPlanDesignImplementOperateOptimize(PDIOO)NetworkLifeCycleAnalyzingBusinessGoalsWorkingwithYourClientChangesin EnterpriseNetworksNetworksMustMakeBusinessSenseNetworksOfferaServiceThischapterprovidestipsforbothcampusandenterpriseWANnetwork designandfocusesonhierarchicalnetworkdesign,whichisatechniquefordesigningscalablecam-pusandWANnetworksusingalayered,modularmodel.Sold byInformITandebookresellers.Introduction.PartI:IdentifyingYourCustomer’sNeedsandGoals.$Buynow.Itfocuses.ChapterAnalyzingBusinessGoals andConstraintsThispaperpresentsanintegratedtop-downdesignapproachandshowshowitcanminimizetheunnecessaryconfigurationcomplexityinrealizing userreachabilitycontrol,akeynetworkdesignobjectivethatinvolvesdesigningthreedistinctnetworkelements:VLAN,IPaddress,andpacketfilterPublished network-technicianman-hours,showsnearly%insavingscomparedtothereferencedesignReferenceDesign:IPoverWDMThecore-IPnetworkdesignedwith anIP-over-WDM†approachcanbemodeledasacollectionofroutersindifferentcityPoPs(Points-of-Presence)Youcanfilloutthefollowingchecklistsasyou gatherdesigninformationVitalSourceeTextbookExpandPDFNetworkDesignChecklistsItfocusesAnalyzingBusinessGoalsandConstraintsISBNTopDownNetworkDesign.ThebackboneroutersinTop-DownNetwork PDFfileTop-DownNetworkDesignChapterTwoAnalyzingTechnicalGoalsand TradeoffsOriginalslidesbyCiscoPress&PriscillaOppenheimerDocumentsTop-DownNetworkDesignassociatedwithcallThetop-downapproach:Thetopdowndesignapproachsimplifiesthedesignpro-cessbysplittingthedesigntaskstomakeitmorefocusedonthedesignscopeandperformedinamorecontrolled manner,whichcanultimatelyhelpnetworkdesign-erstoviewnetworkdesignsolutionsfromabusiness-drivenapproachTop-downnetworkdesignisa methodologyfordesigningnetworksthatbeginsattheupperlayersoftheOSIreferencemodelbeforemovingtothelowerlayersUsingaTop-DownNetwork DesignMethodologyAcommonstrategyfornetworkdesignistotakeatop-downapproach