17.要确保交换机成为VLAN 30的根网桥,可使用下面哪两个命令之一?
A.spanning-tree vlan 30 priority 0
B.spanning-tree vlan 30 priority 16384
C.spanning-tree vlan 30 root guarantee
D.spanning-tree vlan 30 root primary
17.要确保交换机成为VLAN 30的根网桥,可使用下面哪两个命令之一?
A.spanning-tree vlan 30 priority 0
B.spanning-tree vlan 30 priority 16384
C.spanning-tree vlan 30 root guarantee
D.spanning-tree vlan 30 root primary