说明: 拓扑图如图所示,PC0接Switch0的FastEthernet0/1端口,PC1接Switch1的FastEthernet0/1端口,PC2接Switch2的FastEthernet0/1端口,Switch0的端口GigabitEthernet1/1与三层交换机的FastEthernet0/1相连,Switch1的端口GigabitEthernet1/1与三层交换机的FastEthernet0/2相连,Switch2的端口GigabitEthernet1/1与三层交换机的FastEthern
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