IEEE 802.11定义了无线局域网的两种工作模式，其中（）模式是一种点对点连接的网络，不需要无线接入点和有线网络的支持。
- A.Roaming
- B.Ad Hoc
- C.Infrastructure
- D.DiffuseIR
正确答案及解析
正确答案
解析
本题考查无线局域网的相关概念，无线局域网（WLAN）分为两大流派：一是面向数据通信的计算机局域网发展而来的，采用的是无连接协议，即IEEE 802.11标准；另一个是致力于面向语音的蜂窝电话，采用的是基于连接的协议，即HIPERLAN-2标准。在“网络工程师”考试中，主要要求掌握的是IEEE 802.11标准。IEEE 802.11先后发布了四个标准，它们的关键知识点如下表所示：
IEEE 802.11标准定义了两种无线网络的拓扑结构：一是基础设施网络（Infrastructure），它是通过无线接入点（AP）将其连到现有网络中；二是特殊网络（Ad Hoc），它是一种点对点连接。它不需要无线接入点和有线网络的支持。
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