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单选题

OSPF is a link-state routing protocol。It is designed to be run internal to a single ()system。Each OSPF router maintains an identical ()describing the autonomous system’s topology。From this database,a routing table is calculated by constructing a shortest-path ()。OSPF recalculates routes quickly in the face of topological changes,utilizing a minimum of routing (74) traffic。OSPF provides support for equal-cost multipath。An area routing capability is provided,enabling an additional level of routing protection and a reduction in routing protocol ()。

A
protocol
B
network
C
broadcast 
D
multipath
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答案:

D

解析:

题干中提到OSPF是一种链路状态路由协议,设计用于在单个自治系统内部运行。每个OSPF路由器维护一个描述自治系统拓扑的相同数据库,从这个数据库中计算出路由表。题干中明确提到OSPF提供对等成本多路径的支持,因此空格处应填写与多路径相关的选项。在给出的选项中,只有D选项“multipath”与多路径相关,因此D是正确答案。

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