根据下面的文字资料回答 71～75 题 n 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（ 1 ）routing algorithm that（ 2 ）work done on the OSI IS-IS intradomain routing protocol．This routing，as compared to distance-vector routing，requires（ 3 ）processing power．The Dijkstra algorithm is used to calculate（ 4 ）OSPF routing table updates only take place when necessary，（ 5 ）at regular intervals．

第6题：文中（ 1 ）处正确的答案是（ ）。

A．distance-vector

B．link-state

C．flow-based

D．selective flooding

[单选题]根据下面的文字资料回答 71～75 题In the following essay，each blank has fourchoices．Choose the best answer and write down on thean，swer sheet．Microwave communication uses（ 1 ）frequency radio waves that travel instraighdine sthroughthe air．Because the waves cannot（

[单选题]根据下面的文字资料回答 71～75 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．A（ 1 ）is basically an end point of a communication link between two applications.Sockets that

[单选题]根据下面的文字资料回答 71～75 题 In the following essay．each blank has four choices．Choose the best answer and write down on the answer sheet．Spread spectrum simply means that data is sent in（ 1 ）pieces over a number of the discrete frequencies available for use

[单选题]根据下面的文字资料回答 71～75 题 The purpose of the requirements definition phase is to produce a clear,complete，consistent，and testable（ 1 ）of the technical requirements for the software produet．D．uring the requirements definition phase，the requirements deftnifi

[单选题]根据下面的文字资料回答 71～75 题 connected by（ 1 ）or Hubs,which just move the bits from one network to an identical network. One layer up we find bridgas and swiehes,which operate at data link layer. They can accept （ 2 ） , examine the MAC address, and forward th

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[单选题]根据下面的文字资料回答 63～67 题In low-speed network，it is usually adequate to wait for congestion to occur andthen react to it by telling the source of packets to slow down．In high-speednetworks，this approach oftenworks poorly，because in the（ 1 ）between sending

[单选题]根据下面的文字资料回答 66～70 题In low-speed network，it is usually adequate to wait for congestion to occur andthen react to it by telling the source of packets to slow down．In high-speednetworks，this approach oftenworks poorly，because in the（ 1 ）between sending

[单选题]根据下面的文字资料回答 12～14 题N模冗余系统如图1所示，由Ⅳ(N=2n+1)个相同部件的副本和一个(n+1)/N表决器组成，表决器把Ⅳ个副本中占多数的输出作为系统的输出。设表决器完全可靠，且每个副本的可靠性为R，则该N模冗余系统的可靠性R=（ 1 ）。若R。=e-λt，当kt=（ 2 ），R。=（ 3 ），R是不倚赖于Ⅳ的恒定值（ 4 ）；当R。小于（ 3 ），R是N的（ 5 ）。第12题：A．B．C．D．