题目内容：
如下图所示，在一台CiscoCatalyst3500交换机上连接2台PC机，使用端口划分方法将它们分别划分在VLANID为21、22，VLAN名为VL21、VL22的VLAN中，下列关于交换机VLAN的配置，正确的是 
A．Switch-3548#vlandata Switch-3548(vlan)#vlan21namevl21
Switch-3548(vlan)#vlan22namevl22
Switch-3548(vlan)#exit
Switch-3548#configureterminal
Switch-3548(config)#interfacef0/1
Switch-3548(config-if)#switchportallowedvlan21
Switch-3548(config-if)#exit
Switch-3548(config)#inerfacef0/2
Switch-3548(config-if)#switchportallowedvlan22
B．Switch-3548#vlandata
Switch-3548(vlan)#setvlan21namevl21
Switch-3548(vlan)#setvlan22namevl22
Switch-3548(vlan)#exit
Switch-3548#configureterminal
Switch-3548(config)#interfacef0/1
Switch-3548(config-if)#switchportaccessvlan21
Switch-3548(config-if)#exit
Switch-3548(config)#inerfacef0/2
Switch-3548(config-if)#switchportaccessvlan22
C．Switch-3548#vlandata
Switch-3548(vlan)#vlan21namevl21
Switch-3548(vlan)#vlan22namevl22
Switch-3548(vlan)#exit
Switch-3548#configureterminal
Switch-3548(config)#interfacef0/1
Switch-3548(config-if)#switchportaccessvlan21
Switch-3548(config-if)#exit
Switch-3548(config)#inerfacef0/2
Switch-3548(config-if)#switchportaccessvlan22
D．Switch-3548#vlandata
Switch-3548(vlan)#vlan21namevl21
Switch-3548(vlan)#vlan22namevl22
Switch-3548(vlan)#exit
Switch-3548#configureterminal
Switch-3548(config)#interfacef0/1
Switch-3548(config-if)#switchportaccess21
Switch-3548(config-if)#exit
Switch-3548(config)#inerfacef0/2
Switch-3548(config-if)#switchportaccess22
参考答案：
答案解析：