集线器_交换机_路由器的区别

Serial Point-to-Point ConnectionsRouter connectionsNetwork connections at the CSU/DSUEIA/TIA-232 EIA/TIA-449 EIA-530V.35 X.21CSU/DSUEnd user deviceService ProviderDTEDCEPoint-to-point orcircuit-switched connectionCO SwitchCustomer Premises EquipmentDemarcationLocal LoopWAN service provider toll networkTrunks and switchesProvider assigns connection parameters to subscriberS SS SSS SLayer 2 DesignDetermining the size of collision domains in hubbed and switched networks Layer 2 DesignDiagramming hub placement in a standards-based extended star topology ARP地址解析协议 知道 IP地址，找 MAC地址Address Resolution Protocol172.16.3.1 172.16.3.2IP: 172.16.3.2 = ?I need the Ethernet address of 176.16.3.2.Address Resolution Protocol172.16.3.1IP: 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 message is for me. Here is my Ethernet address.Address Resolution Protocol Map IP Ethernet Local 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 message is for me. Here is my Ethernet address.Example 1: Destination localFinding the MAC AddressRouter AExample 2: Destination not localHost ZHost Y QueryBroadcast Host ZMAC ? Host ZResponseHost YMACRouter AMACRouting Table:Net forHost Z Map IP Ethernet Not 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 Ethernet Ethernet is a half-duplex technology Most important are receive(RX),transmit(TX),and collision detection Ethernet physical connector provides several circuitsEthernet 10BaseT transmission time Packet size in bytes Transmission time in ms64 51.2512 4101000 8001518 1214Microsegmentation Dedicated paths between sending and receiving hostsLAN segmentation with bridges How a switch learns addresses Learns a stations location by examining the source address Send out all 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 interface Filters when the destination is located on the same interfaceTwo switching methods Preamble SFDDestination hardwareAddressSourceHardwareAddressLength DATA FCS7bytes 1byte 6bytes 6bytes 2bytes 46-1500 4bytesDefault switching: cut-through no error check