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单项选择题What is the function of the command switchport trunk native vlan 999 on a?()

A、It designates VLAN 999 for untagged traffic.

B、It blocks VLAN 999 traffic from passing on the trunk.

C、It createsa VLAN 999 interface.

D、It designates VLAN 999 as the default for all unkown tagged traffic.

  • D
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