What is the function of the command switchport trunk native vlan 999 on a Cisco Catalyst switch?
A、
It creates a VLAN 999 interface．
B、
It designates VLAN 999 for untagged traffic．
C、
It blocks VLAN 999 traffic from passing on the trunk．
D、
It designates VLAN 999 as the default for all unknown tagged traffic．
【正确答案】
B
【答案解析】
native vlan是不打标签的VLAN，这指定native vlan 为999，表明 VLAN 999为不用打标签的VLAN
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