[单选题]The Ezonexam network administrator has issued the "VTP password ezonexam" command on a Cisco device. What is the purpose of this command?

正确答案 ：D

It is used to validate the sources of VTP advertisements sent between switches

[单选题]IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP和掩码结合，共划分了多少个子网（不包括全0子网和全1子网）（）

正确答案 ：B

30

[单选题]扩展IP访问权限表的表号范围是：()

正确答案 ：C

100-199

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