问题 单项选择题

5km2的某大学拟建设无线校园网,要求室外绝大部分区域、主要建筑物内实现覆盖,允许同时上网用户数量为3000个以上,主要业务网络包括上网浏览、电子邮件、FTP、QQ等。设计师在无线设备选型阶段,最可能采用______。

A.基于3G的高性价比设备方案
B.基于LTE的高性价比设备方案
C.基于802.11n的高性价比瘦AP方案
D.基于802.11n的高性价比胖AP方案

答案

参考答案:C

解析: 依题意,通常,“瘦”AP组网模式是将WLAN所有的数据处理与控制能力都放置在无线交换机上,将AP集中,统一由无线控制器(WNC)进行管理,这是一种集中式架构体系。相对而言,“胖”AP组网模式是将WLAN所有的数据处理与控制能力都放置在AP上。这是一种传统的、分布式架构体系,也称为自治型无线接入点的组网模式。综合对比这两种WLAN组网模式在管理、功能、安全、成本、可扩展性方面的区别,并考虑该校园网无线AP数量较多(通常,单个无线AP在开放空间最大覆盖范围仅为100m~400m)且有很多AP部署在室外,为方便管理,张工最可能采用基于IEEE802.11n的高性价比瘦AP的设备选型方案。

阅读理解
阅读理解。
     To make sure that you enjoy your visit to the Hamper Hot Springs (泉)
and that you are safe during your visit, please take time to read the following: 
     ◆ Do not place your head under the hot water because it may be bad
for your health. ? Do not run around because the floors may be slippery. 
     ◆ Do not leave your children alone.
     ◆ Do not leave your things about. Just ask one of our workers to look
after your things. ? Do not eat or drink anything in the area because we want
to keep here clean.
     There is a place for you to eat and have soft drinks, when you want to have a rest. 
     ◆ Do not bring into the area anything made of glass, because it may be easily broken when you fall.
     ◆ Do not bring any hard drinks into the area. 
     ◆ Do not smoke in the area. 
     ◆ Do not stay in the sunlight for too long. We hope that you will enjoy your visit here.
1. The purpose of this notice is _____. 
A. to ask people to visit the springs
B. to make visitors know the area
C. to tell visitors what not to do
D. to tell the visitors to have a rest
2. The notice is written for _____.
A. visitors
B. children
C. workers
D. managers
3. People are not allowed to _____.
A. bring angthing into the area
B. have soft drinks in the area
C. look after children in the area
D. sit in the sun for long in the area
4. _____ is NOT mentioned in the notice.
A. How long visitors can stay in the area
B. What visitors cannot bring to the area
C. Who looks after the visitors' things
D. Whether smoking is allowed in the area
5. The Chinese meaning for "slippery" is _____.
A. 平坦的
B. 湿滑的
C. 狭窄的
D. 冰凉的
多项选择题