2. 计算机
  3. The metric assigned to each network depends on the type of protocol．Some simple protocol，like RIP，treats each network as equals．

The metric assigned to each network depends on the type of protocol．Some simple protocol，like RIP，treats each network as equals．

admin2015-05-18  5
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  (71)  of passing through each network is the same；it is one  (72)  count．So if a packet passes through 10 network to reach the destination，the total cost is 1 0 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  (73)through a network can have different costs(metrics)．For example，if maximum  (74) is the desired type of service，a satellite link has a lower metric than a fiber—optic line．On the other hand，if minimum  (75)  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．(2010年下半年试题)
(75)
选项 A、delay
B、stream
C、packet
D、cost
答案A
解析 译文：每个网络采用的度量标准依赖于协议类型。对于简单的协议，如RIP，将每个网络同等对待。通过每个网络的代价都是一跳。因此，如果一个分组通过10个网络后到达目的地，则总的代价为10跳。其他协议，如OSPF，允许网络管理员基于服务为通过的网络设置代价。因此，通过一个网络的路由可能有不同的代价(度量标准)。例如，若期望服务类型是最大吞吐量，则卫星链路比光纤线路的度量小。如果期望的服务类型是最小时延，则光纤线路的度量小于卫星链路。OSPF允许每个路由器有几张基于服务类型的路由表。
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