单选题Which of the following commands can be issued without interfering with the operation of loop guard？（）ASwitch（config-if）#spanning-tree guard rootBSwitch（config-if）#spanning-tree portfastCSwitch（config-if）#switchport mode trunkDSwitch（config-if）#switchport mode access
单选题
Which of the following commands can be issued without interfering with the operation of loop guard？（）
A
Switch（config-if）#spanning-tree guard root
B
Switch（config-if）#spanning-tree portfast
C
Switch（config-if）#switchport mode trunk
D
Switch（config-if）#switchport mode access
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