●In the following essay,each blank has four choices.Choose the most suitable one from the four choices and write down in the answer sheet.distance-vectorlink-stateflow-basedselective flooding(67)
A、derived from
B、deviated from
C、was derived from
D、was deviated from(68) A.moreB.lessC.sameD.most(69) A.routesB.roadC.distanceD.cost(70) A.but ratherB.rather tooC.rather thanD.rather that
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试题解析
【解析】OSPF(Open Shortest Path First)是一个内部网关协议(Interior Gateway Protocol,IGP),用于在单一自治系统(Autonomous System,AS)内决策路由。与RIP相对,OSPF是链路状态路由协议,而RIP是距离矢量路由协议。链路是路由器接口的另一种说法,因此OSPF也称为接口状态路由协议。OSPF通过路由器之间通告网络接口的状态来建立链路状态数据库,生成最短路径树,每个OSPF路由器使用这些最短路径构造路由表。