A.Open Message B.Close Message C.Notification Message D.Keepalive Message
A.Broadcast B.NBMA C.Point-to-point D.Point-to-multipoint
A.分层结构的拓扑实现 B.基于SPF计算出的无环路径 C.基于areaID D.基于ASID
A.1 B.2 C.3 D.4
A.RIP B.OSPF C.IGRP