A.255.255.255.224B.255.255.255.128C.255.255.255.240D.255.255.255.192E.255.255.255.0
A.4096B.256C.512D.1024
A.路由器廣播B.目的地不可達(dá)C.鄰居地址D.路由重定向E.主機(jī)確認(rèn)F.超時(shí)