无线城域网标准IEEE 802.16规定的有效覆盖范围最大可达（）。
- A.2km
- B.5km
- C.10km
- D.30km
正确答案及解析
正确答案
解析
IEEE 802.16又称为IEEE Wireless MAN空中接口标准，是适用于2-66 GHz的空中接口规范。由于它所规定的无线接入系统覆盖范围可达30km，因此802.16系统主要应用于城域网，被视为可与DSL竞争的“最后一公里” 宽带接入解决方案。根据使用频段高低的不同，802.16系统可分为应用于视距和非机距两种，其中使用2-11GHz频段的系统应用于非视距范围，而使用 10-66GHz频段的系统应用于视距范围。根据是否支持移动特性，IEEE 802.16标准系列又可分为固定宽带无线接入空中接口标准和移动宽带无线接入空中接口标准，其中的802.16、802.16a、802.16d属于固定无线接入空中接口标准，而802.16e属于移动宽带无线接入空中接口标准。
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