2. 计算机
  3. In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the an

In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the an

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问题 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.
   Open Shortest Path First(OSPF)is a(71)routing algorithm that(72)work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires(73)processing power. The(74)algorithm is used to calculate routes. OSPF routing table updates only take place when necessary,(75)at regular intervals.
选项 A、but rather
B、rather too
C、rather than
D、rather that
答案D
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。
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