判断题
A.ip route 0.0.0.0 255.255.255.0 fa0/1 B.ip route 0.0.0.0 0.0.0.0 3.3.3.2 C.ip route 0.0.0.0 0.0.0.0 D.ip route 0.0.0.0 255.0.0.0 3.3.3.0
A.Telnet B.Ping C.ipconfig D.tracert