问题:
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.
● 参考解析
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