集线器交换机路由器的区别.ppt

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1、Serial Point-to-Point ConnectionsRouter connectionsNetwork connections at the CSU/DSUEIA/TIA-232EIA/TIA-449EIA-530CSU/DSUEnd user deviceService ProviderDTEDCEPoint-to-point orcircuit-switched connectionCO SwitchCustomer Premises EquipmentDemarcationLocal LoopWAN service provider toll networkTrunks a

2、nd switchesProvider assigns connection parameters to subscriberSSSSSSSLayer 2 DesignDetermining the size of collision domains in hubbed and switched networks Layer 2 Design Diagramming hub placement in a standards-based extended star topology ARPARP地址解析协议地址解析协议知道IP地址，找MAC地址Address Resolution Protoco

3、lIP:172.16.3.2=?I need the Ethernet address of 176.16.3.2.Address Resolution ProtocolIP:172.16.3.2 IP:172.16.3.2=?I need the Ethernet address of 176.16.3.2.I heard that broadcast.The message is for me.Here is my Ethernet address.Address Resolution ProtocolMap IP EthernetLocal ARPIP:172.16.3.2 IP:172

4、.16.3.2=?I need the Ethernet address of 176.16.3.2.I heard that broadcast.The message is for me.Here is my Ethernet address.Example 1:Destination localFinding the MAC AddressRouter AExample 2:Destination not localHost ZHost YQueryBroadcastHost ZMAC?Host ZResponseHost YMACRouter AMACRouting Table:Net

5、 forHost ZMap IP EthernetNot Local ARP广播 单播 能收到 能收到 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）Half-duplex EthernetEthernet is a half-duplex technology Most important are receive(RX),transmit(TX),and collision detection Ethernet physical connector provides several circuitsEthernet 1

6、0BaseT transmission time Packet size in bytesTransmission time in ms6451.2512410100080015181214 Microsegmentation Dedicated paths between sending and receiving hostsLAN segmentation with bridges How a switch learns addresses Learns a stations location by examining the source addressSend out all port

7、s 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 Two switching methods PreambleSFDDestination 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