交换机实用操作黄皮书
二层交换技术是发展对比老练，二层交换机属数据链路层设备，能够识别数据包中的MAC地址信息，基于MAC地址进行转发，并将这些MAC地址与对应的端口记录在自己内部的一个地址表中(Layer 2 switching technology is relatively mature in development. Layer 2 switches are data link layer devices that can identify the MAC address information in data packets, forward based on the MAC address, and record these MAC addresses and corresponding ports in one of its own internal address table)
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