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The metric assigned to each network depe
The metric assigned to each network depe
admin
2022-08-02
39
问题
The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The( )of passing through each network is the same; it is one( )count. So if a packet passes through 10 network to reach the destination, the total cost is 10 hop counts. Other protocols, such as OSPF, allow the administrator to assign a cost for passing through a network based on the type of service required. A( )through a network can have different costs (metrics). For example, if maximum( )is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum( )is the desired type of service, a fiber-optic line has a lower metric than a satellite line. OSPF allow each router to have several routing table based on the required type of service.问题1选项A.numberB.connectionC.diagramD.cost问题2选项A.processB.hopC.routeD.flow问题3选项A.flowB.windowC.routeD.cost问题4选项A.packetB.throughputC.errorD.number问题5选项A.delayB.streamC.packetD.cost
选项
答案
DBCBA
解析
赋予每一个网络的路由度量依赖于协议的类型。对于像RIP这样的简单协议,可以认为每个网络都是相同的,因而通过每一个网络的费用也都是相同的,其费用为1。所以,如果一个分组经过10个网络到达目标,则总的费用就是10跳。其他的协议,例如OSPF,允许网络管理员根据要求的服务类型赋予所通过的网络一个度量值。通过一个网络的路由可以具有不同的费用。例如,若期望的服务类型为最大吞吐率,则卫星链路比光纤线路的费用低。另一方面,如果期望的服务类型为最小延迟,则光纤线路比卫星线路的费用低。OSPF协议允许每一个路由器根据需要的服务类型设置几个不同的路由表。
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本试题收录于:
中级 网络工程师题库软件水平考试初中高级分类
中级 网络工程师
软件水平考试初中高级
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