在全局配置模式“(config)#”进行交换机配置,欲将端口f0/1纳入VLAN20,使用的命令及配置步骤是()。
A.interface f0/1↙ → switchport mode access↙ → switchport access vlan20↙ → end↙
B.switchport mode access↙ → interface f0/1↙ → switchport access vlan20↙ → end↙
C.switchport access vlan20↙ → interface f0/1↙ → switchport mode access↙ → end↙
D.configure f0/1↙ → switchport mode access↙ → switchport access vlan20↙ → end↙