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NORTHERN CPET 260 - Physical and Logical Topologies

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Chapter FiveObjectivesSimple Physical TopologiesSlide 4Slide 5Slide 6Hybrid Physical TopologiesSlide 8Slide 9Slide 10Enterprise-Wide TopologiesSlide 12Slide 13Slide 14Slide 15Slide 16Wide Area Network (WAN) TopologiesSlide 18Slide 19Slide 20Slide 21Logical TopologiesSwitchingEthernetSlide 25Slide 26Slide 27Slide 28Slide 29Slide 30Slide 31IEEE 802.3 (“Ethernet 802.2” or “LLC”)Slide 33Novell Proprietary 802.3 (or “Ethernet 802.3”)Ethernet IIIEEE 802.3 SNAPUnderstanding Frame TypesDesign Considerations for Ethernet NetworksLocalTalkToken RingSlide 41Slide 42Slide 43Slide 44Slide 45Design Considerations for Token Ring NetworksFiber Distributed Data Interface (FDDI)Asynchronous Transfer Mode (ATM)Slide 49Chapter SummarySlide 51Slide 52Slide 53Chapter FiveChapter FivePhysical and Logical Physical and Logical TopologiesTopologiesObjectivesObjectivesDescribe the basic and hybrid LAN physical Describe the basic and hybrid LAN physical topologies, their uses, advantages, and topologies, their uses, advantages, and disadvantagesdisadvantagesDescribe a variety of enterprise-wide and Describe a variety of enterprise-wide and WAN physical topologies, their uses, WAN physical topologies, their uses, advantages, and disadvantagesadvantages, and disadvantagesCompare the different types of switching used Compare the different types of switching used in data transmissionin data transmissionUnderstand the transmission methods, or Understand the transmission methods, or logical topologies, underlying Ethernet, Token logical topologies, underlying Ethernet, Token Ring, LocalTalk, and FDDI networksRing, LocalTalk, and FDDI networksSimple Physical TopologiesSimple Physical TopologiesPhysical topologyPhysical topologyPhysical layout of a networkPhysical layout of a networkA A Bus topologyBus topology consists of a single cable—called consists of a single cable—called a a busbus— connecting all nodes on a network without — connecting all nodes on a network without intervening connectivity devicesintervening connectivity devicesFigure 5-1: Bus topology networkSimple Physical TopologiesSimple Physical TopologiesFigure 5-2: A terminated bus networkSimple Physical TopologiesSimple Physical TopologiesRing topologyRing topologyEach node is connected to the two nearest nodes so the entire Each node is connected to the two nearest nodes so the entire network forms a circlenetwork forms a circleOne method for passing data on ring networks is One method for passing data on ring networks is token passingtoken passingActive topologyActive topologyEach workstation transmits dataEach workstation transmits dataFigure 5-3: A typical ring networkSimple Physical TopologiesSimple Physical TopologiesStar topologyStar topologyEvery node on the network is connected through Every node on the network is connected through a central devicea central deviceFigure 5-4: A typical star topology networkHybrid Physical TopologiesHybrid Physical TopologiesHybrid topologyHybrid topologyComplex combination of the simple physical topologiesComplex combination of the simple physical topologiesStar-wired ringStar-wired ringStar-wired topologiesStar-wired topologies use physical layout of a star in use physical layout of a star in conjunction with token ring-passing data transmission conjunction with token ring-passing data transmission methodmethodFigure 5-5: A star-wired ring topology networkHybrid Physical TopologiesHybrid Physical TopologiesStar-wired busStar-wired busIn a In a star-wired bus topologystar-wired bus topology, groups of workstations are , groups of workstations are star-connected to hubs and then networked via a single busstar-connected to hubs and then networked via a single busFigure 5-6: A star-wired bus network topologyHybrid Physical TopologiesHybrid Physical TopologiesDaisy-ChainedDaisy-ChainedA A Daisy chainDaisy chain is linked series of devices is linked series of devicesFigure 5-7: A daisy-chained star-wired bus topologyHybrid Physical TopologiesHybrid Physical TopologiesHierarchical hybrid topologyHierarchical hybrid topologyUses layers to separate devices by priority or functionUses layers to separate devices by priority or functionFigure 5-8: A hierarchical ring topologyEnterprise-Wide TopologiesEnterprise-Wide TopologiesEnterpriseEnterpriseAn entire organizationAn entire organizationBackbone networksBackbone networksSerial backboneSerial backboneDistributed backboneDistributed backboneCollapsed backboneCollapsed backboneParallel backboneParallel backboneEnterprise-Wide TopologiesEnterprise-Wide TopologiesSerial backboneSerial backboneTwo or more hubs connected to each other by a single cableTwo or more hubs connected to each other by a single cableDistributed backboneDistributed backboneHubs connected to a series of central hubs or routers in a hierarchyHubs connected to a series of central hubs or routers in a hierarchyFigure 5-9: A simple distributed backbone networkEnterprise-Wide TopologiesEnterprise-Wide TopologiesFigure 5-10: A distributed backbone connecting multiple LANsEnterprise-Wide TopologiesEnterprise-Wide TopologiesCollapsed backboneCollapsed backboneUses a router or switch as the single central Uses a router or switch as the single central connection point for multiple subnetworksconnection point for multiple subnetworksFigure 5-11: A collapsed backbone networkEnterprise-Wide TopologiesEnterprise-Wide TopologiesParallel BackboneParallel BackboneCollapsed backbone arrangement that consists of more than one Collapsed backbone arrangement that consists of more than one connection from central router or switch to each network segmentconnection from central router or switch to each network segmentFigure 5-12: A parallel backbone networkEnterprise-Wide TopologiesEnterprise-Wide TopologiesMesh networksMesh networksRouters are interconnected with other routers, with at least two Routers are interconnected with other routers, with at least two pathways connecting each routerpathways connecting each routerFigure 5-13: An example of a mesh networkWide Area Network (WAN) Wide Area Network (WAN) TopologiesTopologiesPeer-to-peer topologyPeer-to-peer topologyWAN with single interconnection points for each locationWAN with single interconnection points for each locationDedicated circuitsDedicated circuitsContinuous physical or logical connections between two access Continuous physical or logical connections between two


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