A.显示MAC地址
B.显示ONU在线情况
C.显示系统
D.显示登陆用户
A.127.0.0.1/255.0.0.0
B.127.0.0.1/255.255.0.0
C.127.0.0.1/255.255.255.0
D.127.0.0.1/255.255.255.255