单选题在思科交换机上使用switchport trunk native vlan 20命令的含义是什么（）。A创建vlan20的接口B指定vlan20的流量不能被打标记C阻止vlan20的流量在干道通过D所有未打标记的流量都默认指定为vlan20
单选题
在思科交换机上使用switchport trunk native vlan 20命令的含义是什么（）。
A
创建vlan20的接口
B
指定vlan20的流量不能被打标记
C
阻止vlan20的流量在干道通过
D
所有未打标记的流量都默认指定为vlan20
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