With network OSI 7 layers of introductions, divide one layer of a responsible ones idea in order to set up the network, prove that uses the most extensive Ethernet network technology;
OSI 7层的介绍，以建立网路分层负责的观念，并说明现今运用最为广泛的乙太网路技术；
Service network layer: the service network USES the mature Ethernet switch redundancy technology, such as the stack or main standby mode.
业务网络层：业务网络采用成熟的以太网交换机冗余技术，比如堆叠或者主备模式。
Now Ethernet is the main network technology used in Intranet, Ethernet switch is used to partition network segment and to make interconnection in network.
以太网是当前园区网所使用的主要网络技术，利用以太网交换机划分网段并实现网内互联。
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