A.route ip172.0.0.0255.0.0.0s0 B.ip route0.0.0.00.0.0.0172.16.20.1 C.ip route0.0.0.0255.255.255.255172.16.20.1 D.route ip0.0.0.0255.255.255.0172.16.10.1150
A.包過濾防火墻 B.代理防火墻 C.狀態(tài)檢測防火墻 D.電路層防火墻