集线器交换机路由器的区别.pptx

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1、Serial Point-to-Point ConnectionsRouter connectionsNetwork connections at the CSU/DSUEIA/TIA-232EIA/TIA-449EIA-530V.35X.21CSU/DSUEnd user deviceService ProviderDTEDCE第1页/共27页Point-to-point orcircuit-switched connectionCO SwitchCustomer Premises EquipmentDemarcationLocal LoopWAN service provider toll

2、 networkTrunks and switchesProvider assigns connection parameters to subscriberSSSSSSS第2页/共27页第3页/共27页第4页/共27页第5页/共27页第6页/共27页第7页/共27页第8页/共27页Layer 2 DesignDetermining the size of collision domains in hubbed and switched networks 第9页/共27页Layer 2 Design Diagramming hub placement in a standards-based

3、extended star topology 第10页/共27页ARPARP地址解析协议地址解析协议知道IP地址，找MAC地址第11页/共27页Address Resolution Protocol172.16.3.1172.16.3.2IP:172.16.3.2=?I need the Ethernet address of 176.16.3.2.第12页/共27页Address Resolution Protocol172.16.3.1IP:172.16.3.2 Ethernet:0800.0020.1111172.16.3.2IP:172.16.3.2=?I need the Ether

4、net address of 176.16.3.2.I heard that broadcast.The message is for me.Here is my Ethernet address.第13页/共27页Address Resolution ProtocolMap IP EthernetLocal ARP172.16.3.1IP:172.16.3.2 Ethernet:0800.0020.1111172.16.3.2IP:172.16.3.2=?I need the Ethernet address of 176.16.3.2.I heard that broadcast.The

5、message is for me.Here is my Ethernet address.Example 1:Destination local第14页/共27页Finding the MAC AddressRouter AExample 2:Destination not localHost ZHost YQueryBroadcastHost ZMAC?Host ZResponseHost YMACRouter AMACRouting Table:Net forHost ZMap IP EthernetNot Local ARP第15页/共27页第16页/共27页广播 单播 能收到 能收到

6、 能收到 收不到 收不到 收不到 HUBSWITCHROUTERA 与B通信，C是否收到？（集线器 交换机 路由器的区别）第17页/共27页Half-duplex EthernetEthernet is a half-duplex technology Most important are receive(RX),transmit(TX),and collision detection Ethernet physical connector provides several circuits第18页/共27页Ethernet 10BaseT transmission time Packet s

7、ize in bytesTransmission time in ms6451.2512410100080015181214第19页/共27页第20页/共27页 Microsegmentation Dedicated paths between sending and receiving hosts第21页/共27页LAN segmentation with bridges 第22页/共27页 How a switch learns addresses Learns a stations location by examining the source addressSend out all

8、ports when the destination address is a broadcast,multicast or unknown address(except the port that the frame enter)Forward when the destination is located a different interfaceFilters when the destination is located on the same interface第23页/共27页第24页/共27页 Two switching methods PreambleSFDDestinatio

9、n hardwareAddressSourceHardwareAddressLengthDATAFCS7bytes 1byte 6bytes 6bytes 2bytes 46-1500 4bytesDefault switching:cut-through no error checking FragmentFree:checks for collisionsStore and forward:all errors filtered;has higher latencyStore-and-forward Cut-through第25页/共27页第26页/共27页感谢您的观看！第27页/共27页