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

A、It designates VLAN 999 for untagged traffic.

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

C、It creates a VLAN 999 interface.

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

  • A
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