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单项选择题When a new trunk link is configured on an IOS based switch, which VLANs are allowed over the link?（）

A、By default， all defined VLANs are allowed on the trunk.

B、Each single VLAN， or VLAN range， must be specified with the switchport mode command.

C、Each single VLAN， or VLAN range， must be specified with the vtp domain command.

D、Each single VLAN， or VLAN range， must be specified with the vlan database command.

  • A

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