●根据用户需求选择正确的网络技术是保证网络建设成功的关键，在选择网络技术时应考虑多种因素，下面的各种考虑中，不正确的是  (70)  。

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• 1●在网络设计阶段进行通信流量分析时可以采用简单的80/20规则，下面关于这种规则的说明中，正确的是  (69)  。

  A.这种设计思路可以最大限度满足用户的远程联网需求

  B.这个规则可以随时控制网络的运行状态

  C.这个规则适用于内部交流较多而外部访问较少的网络

  D.这个规则适用的网络允许存在具有特殊应用的网段

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• 2●在域名系统中，根域下面是顶级域（TLD）。在下面的选项中  (68)  属于全世界通用的顶级域。

  A.org

  B.cn

  C.microsoft

  D.mil

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• 3●为了确定一个网络是否可以连通，主机应该发送ICMP  (67)  报文。

  A.回声请求

  B.路由重定向

  C.时间戳请求

  D.地址掩码请求

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• 4●Wi-Fi联盟制定的安全认证方案WPA（Wi-Fi Protected Access）是  (66)  标准的子集。

  A.IEEE 802.11

  B.IEEE 802.11a

  C.IEEE 802.11b

  D.IEEE 802.11i

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• 5●在IEEE 802.11标准中使用了扩频通信技术，下面选项中有关扩频通信技术说法正确的是  (65)  。

  A.扩频技术是一种带宽很宽的红外通信技术

  B.扩频技术就是用伪随机序列对代表数据的模拟信号进行调制

  C.扩频通信系统的带宽随着数据速率的提高而不断扩大

  D.扩频技术就是扩大了频率许可证的使用范围

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• 6●Border Gateway Protocol(BGP) is inter-autonomous system  (71)  protocol. BGP is based on a routing method called path vector routing. Distance vector routing is not a good candidate for inter-autonomous system routing because there are occasions on which the route with the smallest  (72)  count is not the preferred route. For example, we may not want a packet through an autonomous system that is not secure even though it is shortest route. Also, distance vector routing is unstable due to the fact that the routers announce only the number of hop counts to the destination without defining the path that leads to that  (73)  . A router that receives a distance vector advertisement packet may be fooled if the shortest path is actually calculated through the receiving router itself. Link  (74)  routing is also not a good candidate for inter-autonomous system routing because an internet is usually too big for this routing method. To use link state routing for the whole internet would require each router to have a huge link state database. It would also take a long time for each router to calculate its routing  (75)  using the Dijkstra algorism.

  A.routing

  B.switching

  C.transmitting

  D.receiving

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