单项选择题
A.PPP B.UDP C.RIP D.IP
A.CLP B.PT C.HEC D.GFC
A.traceroute -W 3 www.ceiaec.org B.tracert-j 3 www.ceiaec.org C.traceroute -d 3 www.ceiaec.org D.tracert -h 3 www.ceiaec.org