思科网络技术学院教程(第三章 物理层和数据链路层).ppt

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1、第三章Copyright?1998,CiscoSystems,Inc.ICRC_revision_11.3物理层和数据链路层物理层和数据链路层标准Physical(bits,signals,clocking)LANWANDataLink(frames)Ethernet802.3802.5FDDI802.2LLCX.25LinkFrameRelayISDNPPPEIA-530V.35DialonDemandSDLCHDLCV.24HSSIG.703EIA/TIA-232EIA/TIA-449局域网数据链路子层LLC完成上半层的软件功能MAC完成下半层的硬件功能Med

2、iaAccessControl（介质访问控制）LogicalLinkControl（逻辑链路控制）NetworkDataLinkPhysicalLLCMACMACFrame802.3LLCPacketorDatagram物理层和逻辑地址0000.0c12.3456MAC地址MAC地址被烧进网络接口卡的ROM芯片中24bits24bits0000.0c12.3456制造商代码序列号ROMRAMMAC地址判定HostYHostZQueryResponseExample1:DestinationlocalRouterAExample2:Destinationnotloc

3、alHostZBroadcastHostZMAC?HostZHostYMACHostZMACHostYQueryBroadcastHostZMAC?HostZResponseHostYMACRouterAMACRoutingTable:NetforHostZ练习:MAC地址判定HostA0000.0c12.1111HostB0000.0c12.2222HostD0000.0c12.4444RouterC0000.0c12.3333RouterC0000.0c12.5555NetworkYNetworkX局域网技术Copyright?1998,CiscoSystem

4、s,Inc.ICRC_revision_11.3EthernetTokenRingFDDILAN技术概览FDDIDualRingEthernet和IEEE802.3Ethernet是一种共享介质的技术，它允许多台设备同时连接、交替使用同一传输介质。Ethernet/802.3的物理层Host10BaseT——双绞线10Base2——以太网细缆10Base5——以太网粗缆PCMacSunHostHubMACEthernet/802.3接口Cisco路由器的Ethernet/802.3的接口名字使用字母E加一个数字(例如：E0)0800.2006.1a560000.0

5、c12.7c4dE0E10800.890c.34d50000.0c12.83e2Ethernet/802.3工作原理ABCDEthernet/802.3工作原理ABCDEthernet/802.3工作原理ABCDDApplicationPresentationSessionTransportNetworkDataLinkPhysicalEthernet/802.3工作原理ABCDDBandCApplicationPresentationSessionTransportNetworkDataLinkPhysicalApplicationPresentationSes

6、sionTransportNetworkDataLinkPhysicalEthernet/802.3广播DCBAApplicationPresentationSessionTransportNetworkDataLinkPhysicalApplicationPresentationSessionTransportNetworkDataLinkPhysicalApplicationPresentationSessionTransportNetworkDataLinkPhysicalApplicationPresentationSessionTransportNetw

7、orkDataLinkPhysicalABCDEthernet/802.3的冲突检测Ethernet/802.3的冲突检测ABCDEthernet/802.3的冲突检测CDCollisionABEthernet/802.3的冲突检测CollisionABCDCDABEthernet/802.3的冲突检测ABCDCollisionABCDJAMJAMJAMJAMJAMJAMEthernet/802.3的冲突检测ABCDCollisionABCDJAMJAMJAMJAMJAMJAM广域网技术Copyright?1998,CiscoSystems,Inc.ICRC_re

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