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英语翻译Refer to the graphic.Switch 2 has computers attached tha

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英语翻译
Refer to the graphic.Switch 2 has computers attached that belong to VLAN 2.Switch 3 has computers attached that belong to VLAN 3.Switch 1 is a Cisco 2926G Layer 3 switch that has a route module installed.Switch 1 provides connectivity to the other switches and is used to route between the VLANs.At which layer of the three-layer switch design model does Switch 1 operate
physical
data link
core
access
network
*****distribution
说错了,是ccna3 final
翻译如下:
参考如图.交换机2所连计算机划分到VLAN2,交换机3所连计算机划分到VLAN3,交换机1是一台安装有路由模块的思科2926G三层交换机.交换机1提供到其他交换机的连接以及VLAN之间的路由.问交换机操作在三层交换设计模型的那一层?
答案选项:
物理层
数据链路层
核心层
访问层
网络层
分布层