[单选题]把指定端口添加到VLAN的命令是：()

正确答案 ：D

switch port

[单选题]工作在OSI第三层的设备是：()

正确答案 ：B

路由器

[单选题]Given that you have a class B IP address network range, which of the subnet masks below will allow for 100 subnets with 500 usable host addresses per subnet?

正确答案 ：C

255.255.254.0

解析：解析：Explanation:

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