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:有
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