2. 计算机
  3. Refer to the exhibit． Which three statements correctly describe Network Device A?

Refer to the exhibit． Which three statements correctly describe Network Device A?

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问题 Refer to the exhibit． Which three statements correctly describe Network Device A?
选项 A、        With a network wide mask of 255．255．255．128, each interface does not require an IP address．
B、        With a network wide mask of 255．255．255．128, each interface does require an IP address on a unique IP subnet．
C、        With a network wide mask of 255．255．255．0, must be a Layer 2 device for the PCs to communicate with each other．
D、        With a network wide mask of 255．255．255．0, must be a Layer 3 device for the PCs to communicate with each other．
E、        With a network wide mask of 255．255．254．0, each interface does not require an IP address．
答案B,D,E
解析 如图，哪三个选项正确的描述了网络设备A？
考点分析：这题考的是子网掩码的问题。使用掩码255．255．255．128和255．255．255．0时，两台主机的IP地址属于两个网段，所以A要用路由器（三层设备）才能通信，所以A设备每个接口需要设置IP地址。使用掩码255．255．254．0是，两台主机属于同一个网段，所以A要使用switch或hub就能通信，且不需要ip地址。
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