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问题 问答题

【说明】
某学校欲构建校园网，根据实际情况，计划在校园总部采用有线网络和无线网络相结合的接入方式，校园分部通过Internet采用VPN技术与校园总部互联，该校园网采用了分层设计结构，其网络拓扑结构如图2-5所示。


1.【问题1】
该校园网的部分区域部署了无线网络(WLAN)，采用符合IEEE 802.11g标准的无线网络设备，该校园网无线网络部分的最大数据传输速率为 (1) 。

  • A．11Mb/s
  • B．54Mb/s
  • C．100Mb/s
  • D．108Mb/s

答案

参考答案：(2)B，或Infrastructure

解析：[要点解析]
这是一道要求读者根据实际无线局域网拓扑结构判断其工作模式的综合题。本题的解答思路如下。
无线局域网根据是否有无线接入点(AP)分为Infrastructure(基础设施网络)和Ad-Hoc(特殊网络)等两种工作模式。其中，Ad-Hoc模式是一种点对点连接，不需要无线接入点(AP)和有线网络的支持，用无线网卡连接的设备之间就可以直接通信。
基础设施网络(Infrastructure Networking)要求无线终端通过无线接入点(AP)访问骨干网上的设备，或者互相访问。无线接入点主要实现无线网络工作站与WLAN的无缝集成，对无线信号起中继放大的作用，它如同一个网桥实现在IEEE 802.11、IEEE 802.3两种标准的MAC协议之间进行转换。
由于在图2-5拓扑结构中部署了无线接入点AP设备，因此可以判断该无线局域网的工作模式是基础设施网络，即在无线AP配置中“Operating Mode(工作模式)”属性的值应选择“Infrastructure”。

多项选择题

关于脂膜炎，叙述正确的有（）。

A.脂膜炎不是一种临床病名

B.硬皮病在脂肪层表现为间隔性脂膜炎

C.小叶性脂膜炎常见于深在红斑狼疮

D.结节性红斑是间隔性脂膜炎

E.结节性红斑是小叶性脂膜炎
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填空题

It is clear that we are rapidly becoming a global culture. New forms of information technology, intercontinental travel, and the complex nature of economics are all elements in such a change. Japan, an ancient (1) culture, now dominates the West economically while its own traditional (2) is rapidly becoming (3) in the process.
It does not take a great deal of analysis to see the vast interchanges of cultural influences in the world today. The thirst for (4) fashions, popular music, and the other elements of consumer culture (5) great inroads in non-Western lands while the West seeks out everything from the religious traditions of the Ease (6) the art and music these countries produce. In the field of (7) , to cite one conspicuous example, contemporary readers seek books (8) those of the West. Latin American authors, as well as those from Africa, Asia, and India, now find appreciative audiences.
A (9) culture does not mean a unitary or "one world" culture. It does mean that people are increasingly aware of the diversity of culture. World events enter our living rooms so that things that may once have been (10) of as distant (11) now greet us immediately and in color. We may watch those events on a television made in Japan while wearing clothes sewn in Thailand and shoes made in Hungary while snacking (12) food grown in Mexico. Such an economic interdependence reflects the reality of a global banking system, the globalization of the economy, and the increasing (13) of information and information technologies.
(14) has this shrinking of distances (and attitudes) become more clear than in the academic debates over what constitutes a liberal (15) education today. Is it possible (or desirable) to have the Western core of humanities (16) the center-piece of a curriculum The place of non-Western and non-traditional cultures as part of the general (17) of a student is hotly argued in educational circles. The very fact of that discussion (18) to the emergence of a global consciousness with a continued shrinking of parochial attitudes. The (19) that such globalization is hotly debated only emphasizes the profound nature of the (20) taking place in our culture.
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