A.RIP-1 B.OSPF C.BGP-4 D.IS-IS
A.HELLO報文(Hello Packet) B.DD報文(Database Description Packet) C.LSR報文(Link State Request Packet) D.LSU報文(Link State Update Packet)
A.發(fā)現并維持鄰居關系 B.描述本地LSDB的情況 C.向對端請求本端沒有的LSA,或對端主動更新的LSA D.選舉DR、BDR