单项选择题

用户A与用户B通过卫星链路通信时，传播延迟为540ms，假设数据速率是64Kbit/s，帧长4000bit，若采用停等控制协议通信，则最大链路利用率为(22)；若采用后退N帧 ARQ协议通信，发送窗口为8，则最大链路利用率可以达到(23)。

A.0.058
B.0.116
C.0.188
D.0.231
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Which of the following phrase is the most general one? （ ）A.Reducing income-tax rates.B.Reducing budget deficits.C.Expanding the money supply.D.Running a country’s economy.
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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(66)routing algorithm that(67)work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires(68)processing power. The Dijkstra algorithm is used to calculate(69)OSPF routing table updates only take place when necessary,(70)at regular intervals.A.distance-vectorB.link-stateC.flow-basedD.selective flooding
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