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Only need to practice for 20 to 30 hours

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H3CSE-WLAN Sample Questions:

1. 下列属于控制帧的是

A) ACK
B) PS-Poll
C) Null
D) RTS/CTS

2. （多选题)关于 WLAN 常用术语的解释中正确的是

A) BSSID : BSS 的标识,一般为 AP radio 口的 MAC 地址
B) SSID : Service Set ID 服务集识别码,是 WLAN 服务的标识,用于指导用户选择连接哪个 WLAN 服务
C) ESS : Extended Service Set ,采用相同 SSID 的多个 BSS 形成的更大规模的扩展服务集
D) BSS : Basic Service Set 基本服务集,包括 AP 和与之关联的 STA 构成的集合

3. 以下哪些无线 WLAN PHY 层协议只能工作在 5G 频段 ?

A) 802.11n
B) 802.11a
C) 802.11ac
D) 802.11ax

4. 对半径大,并发用户少的区域覆盖规划,说法正确的是

A) 此类区域可使用室内分布式系统进行覆盖,利用原有无线网路（如 PHS 、 CDMA 等)的天馈系统进行 WLAN 系统合路,以达到一个 AP 覆盖较大区域的效果。
B) 在此类区域部署多 AP 时,需要考虑 AP 间信道的划分, AP 间采用较差信道部署以较少干扰,例如部署三个 AP 时, AP1 , AP2 , AP3 ,的信道可分别设置为 1 、 6 、 11
C) 此类区域可使用小功率 AP 分别进行覆盖,覆盖方式可按照半径小、用户少区域的覆盖方式进行,覆盖时需要注意各 AP 频点额隔离。
D) 此类区域是主要的 WLAN 室内应用场所,如综合功能区域,酒店客房等,此类区域可以根据房间、墙壁、立柱等分割成小的区域,看作是多个半径小用户少的组合

5. 关于隐藏节点的描述中正确的是

A) 室外 AP+CPE 环境下为降低隐藏节点的影响可以在 AP 侧开启 RTS/CTS 功能
B) 室分环境下为降低隐藏节点的影响可以在 AP 侧开启 RTS/CTS 功能
C) AP 与 AP 之间形成隐藏节点可能会导致 AP 发给 STA 的报文发生碰撞丢失
D) cts-to-self 是为解决隐藏节点问题的

Solutions: