“”.1“”.2.2.1xIc·PARC1973522“”.2.210Mbps10Mbps10Mbps10Mbps10BASE-THUB10Mbps10Mbps10Mbps10Mbps10Mbps··“”.2.3RAB“”.2.4···“”.2.5·“”.2.61Gbps100Mbps100Mbps100Mbps10Mbps10Mbps10Mbps10Mbps··“”.2.7Cut-throughStore-and-forward··“”.2.8EthernetNICEthernetNIC·CSMA/CDHUAWEI“”.2.9EthernetNICEthernetNIC··“”.3.3.1VLAN1VLAN2VLAN3···“”.3.2·····“”.3.3·802.1d··“”.4