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H3C GB0-342 Exam Syllabus Topics:

H3CSE-WLAN Sample Questions:

1. 以下哪些是 wlan 频段

A) 1900- 1920
B) 825-835
C) 2400-2483.5
D) 1710-1715

2. Wlan 工程中哪些部位的安装不规范,可能导造成对无线信号覆盖强度和质量的影响

A) 线缆（网线、馈线、电源线)
B) AP
C) 供电
D) 天线

3. 以下采用 OFDM 调制技术的 802.11 PHY 层协议是

A) 802.11e
B) 802.11a
C) 802.11g
D) 802.11b

4. 一个 1024QAM 模式下 symbol 符号传输了多数数据（单选题)

A) 16bit
B) 10bit
C) 8bit
D) 6bit

5. 在无线信号的远距离传输中,菲涅尔区（ Fresnel Zone )是一个重要的概念。
以下关于菲涅尔区说法正确的是

A) 在菲涅尔区中的任何障碍物都有可能影响网络的通信,最好给与清楚,保证 60% 的菲涅尔区被视为有效的。一般可以根据经验值
B) 无线信号沿直线传播,但在传播时会散开,而波束之间必需净空就称为菲涅尔区。
C) 菲涅尔区是在视距的路径中形成的一个椭圆区域。它随着可视距离和信号频率的改变而改变,必须的菲涅尔区净空在路径中心处
D) 菲涅尔区的大小是路径长度的函数,路径越长,则菲涅尔区越宽。

Solutions: