单项选择题
某单位IP地址需求数如下表所示,给定地址192.168.1.0/24,按照可变长子网掩码的设计思想,部门3的子网掩码为()
A.255.255.255.128 B.255.255.255.192 C.255.255.255.224 D.255.255.255.240
A.202.117.110.94B.202.117.110.95C.202.117.110.96D.202.117.110.97
A.switchB接口VLAN不正确 B.SwìtchB的接口状态为DOWN C.SwìtchB链路类型配置错误 D.SwitchB对接收到的ICMP报文丢弃