选项
A.
A. Switch#vlan data Switch(vlan)#vlan 21 name v21t Switch(vlan)#vlan 22 name v22 t Switch(vlan)#exit t Switch#configure terminalt Switch(config)#interface FastEthernet0/1t Switch(config-if)#switchport allowed vlan 21t Switch(config-if)#exitt Switch(config)#interface FastEthernet0/2t Switch(config-if)#switchport allowed vlan 22t Switch(config-if)#exit
B.
B. Switch#vlan data Switch(vlan)#set vlan 21 name v21 Switch(vlan)#set vlan 22 name v22 Switch(vlan)#exit Switch#configure terminal Switch(config)#interface FastEthernet0/1 Switch(config-if)#switchport access vlan 21 Switch(config-if)#exit Switch(config)#interface FastEthernet0/2 Switch(config-if)#switchport access vlan 22 Switch(config-if)#exit
C.
C. Switch#vlan data Switch(vlan)#vlan 21 name v21 Switch(vlan)#vlan 22 name v22 Switch(vlan)#exit Switch#configure terminal Switch(config)#interface FastEthernet0/1 Switch(config-if)#switchport access vlan 21 Switch(config-if)#exit Switch(config)#interface FastEthernet0/2 Switch(config-if)#switchport access vlan 22 Switch(config-if)#exit
D.
D. Switch#vlan data Switch(vlan)#vlan 21 name v21 Switch(vlan)#vlan 22 name v22 Switch(vlan)#exit Switch#configure terminal Switch(config)#interface FastEthernet0/1 Switch(config-if)#switchport access 21 Switch(config-if)#exit Switch(config)#interface FastEthernet0/2 Switch(config-if)#switchport access 22 Switch(config-if)#exit
正确答案:C
名词解析
选项A中命令“switchport allowed vlan 21”是错误的。选项B中命令“set vlan 21 name v21”是错误的,选项D中命令“switchport access 21”是错误的。