思科网络技术培训之2基本概念汇总课件.ppt
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- 思科 网络技术 培训 基本概念 汇总 课件
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1、 1999,Cisco Systems,Inc.2-1Chapter 2Internetworking Concepts Overview 1999,Cisco Systems,IICND2-2ObjectivesOn completion of this chapter,you will be able to perform the following tasks:Describe how data traffic is exchanged between source and destination devices Identify the roles and functions of a
2、 hub,switch,and router,and where they best fit in the network Select the appropriate Cisco equipment for a given set of network requirements 1999,Cisco Systems,IICND2-3Defining Components of the NetworkMain OfficeBranch Office Home Office Mobile UsersInternetredundency 1999,Cisco Systems,IICND2-4Flo
3、or 2Floor 1Server FarmDefining the Components of a Network(cont.)Branch OfficeTelecommuterISDNRemoteCampus 1999,Cisco Systems,IICND2-5Network Structure Defined by Hierarchy Distribution LayerCore LayerAccessLayer 1999,Cisco Systems,IICND2-6Access Layer CharacteristicsEnd station entry point to the n
4、etworkAccess Layer 1999,Cisco Systems,IICND2-7Distribution Layer Characteristics Access Layer Aggregation Point Routes traffic Broadcast/Multicast Domains Media Translation Security Possible point for remote accessDistribution Layer 1999,Cisco Systems,IICND2-8Core Layer Characteristics Fast transpor
5、t to enterprise services No packet manipulationCore Layer 1999,Cisco Systems,IICND2-9OSI Model OverviewData Flow LayersTransport LayerData Link Network LayerPhysicalApplication(Upper)LayersSessionPresentationApplication注意注意OSI模型与网络三个层次的区别模型与网络三个层次的区别 1999,Cisco Systems,IICND2-10Keeping different app
6、lications data separateUser InterfaceHow data is presentedSpecial processing such as encryptionTelnetHTTPASCIIEBCDICJPEGOperating System/Application Access SchedulingTransport LayerData Link Network LayerPhysicalEXAMPLESSessionPresentationApplicationRole of Application Layers 1999,Cisco Systems,IICN
7、D2-11TCPUDPSPX802.3/802.2HDLCEIA/TIA-232V.35IPIPXPresentationApplicationSessionEXAMPLESRole of Data Flow Layers Reliable or unreliable delivery Error correction before retransmit Combines bits into bytes and bytes into frames Access to media using MAC address Error detection not correction Move bits
8、 between devices Specifies voltage,wire speed and pin-out cablesTransport Data LinkPhysical Network Provide logical addressing which routers use for path determination 1999,Cisco Systems,IICND2-12Encapsulating DataTransport Data LinkPhysical Network Upper Layer DataUpper Layer DataTCP HeaderDataIP H
9、eaderDataLLC Header0101110101001000010DataMAC HeaderPresentationApplicationSessionSegmentPacketBitsFramePDUFCSFCSProtocol data units 1999,Cisco Systems,IICND2-13Upper Layer DataDe-encapsulating DataLLC Hdr+IP+TCP+Upper Layer DataMAC HeaderIP+TCP+Upper Layer DataLLC HeaderTCP+Upper Layer DataIP Heade
10、rUpper Layer DataTCP Header0101110101001000010Transport Data LinkPhysical Network PresentationApplicationSession 1999,Cisco Systems,IICND2-14ApplicationPresentationSessionTransportNetworkData LinkPhysicalOSI ModelPDUFunctional ResponsibilitiesExamplesWritten Exercise:OSI Model 1999,Cisco Systems,IIC
11、ND2-15Physical Layer FunctionsDefines Media type Connector type Signaling typeEthernet802.3V.35PhysicalEIA/TIA-232 1999,Cisco Systems,IICND2-16Physical Layer:Ethernet/802.3HubHostsHost10Base2Thick Ethernet10Base5Thick Ethernet10BaseTTwisted Pair 1999,Cisco Systems,IICND2-17Hubs Operate at Physical l
12、ayerABCDPhysical All devices in the same collision domain All devices in the same broadcast domain Devices share the same bandwidth 1999,Cisco Systems,IICND2-18Hubs:One Collision Domain More end stations means more collisions CSMA/CD is used 1999,Cisco Systems,IICND2-19Data Link layer FunctionsDefin
13、es Physical source and destination addresses Higher layer protocol(Service Access Point)associated with frame Network topology Frame sequencing Flow control Connection-oriented or connectionlessData LinkPhysicalEIA/TIA-232v.35EthernetFrame RelayHDLC802.2802.3 1999,Cisco Systems,IICND2-20DataSource a
14、ddFCSLengthDest addVariable26640000.0C xx.xxxxVendor assignedIEEE assignedMAC Layer-802.3Data Link Layer Functions(cont.)PreambleEthernet II uses“Type”here and does not use 802.2.MAC Address8#Bytes 1999,Cisco Systems,IICND2-21DataDest SAPSource SAPDataSource addFCSLengthDest addVariable11802.2(SAP)M
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