问题 单项选择题

下面的无线网络加密方法中,()的安全性高。

A.MAC地址过滤

B.WEP

C.WPA

D.WPA2

答案

参考答案:D

解析:

无线MAC地址过滤功能通过MAC地址允许或拒绝无线网络中的计算机访问广域网,有效控制无线网络内用户的上网权限。   

有线等效加密(Wired Equivalent Privacy),又称无线加密协议(Wireless Encryption Protocol),简称WEP,是个保护无线网络(Wi-Fi)信息安全的体制。因为无线网络是用无线电把信息传播出去,它特别容易被窃听。WEP的设计是要提供和传统有线的局域网路相当的机密性,而依此命名的。不过密码分析学家已经找出WEP好几个弱点,因此在2003年被Wi-Fi Protected Access(WPA)淘汰。   

WAP(Wireless Application Protocol)为无线应用协议,是一项全球性的网络通信协议。WAP使移动Internet有了一个通行的标准,其目标是将Internet的丰富信息及先进的业务引入到移动电话等无线终端之中。WAP定义可通用的平台,把目前Internet网上HTML语言的信息转换成用WML(Wireless Markup Language)描述的信息,显示在移动电话的显示屏上。WAP只要求移动电话和WAP代理服务器的支持,而不要求现有的移动通信网络协议做任何的改动,因而可以广泛地应用于GSM、CDMA、TDMA、3G等多种网络。   

WAP2.0是为加强WAP的实用性而设计的,迎合了市场的需求,并且适应了当前更高带宽、更快的数据传输速度、更强大的接入能力和不同的屏规格大小等最新的行业发展趋势。利用先进的网络和新增的服务功能,支持WAP2.0的终端将可以接入到各种基于互联网的内容、应用和服务。   

所以,WPA2的安全性高。

单项选择题

When I was young, my parents ran a snack bar in our small town.One evening in early April, my mother told me to fill in at the snack bar (1) a worker who had the flu. I told her I would mess it up, (2) I had never worked at the bar before. I (3) that instead of making money, I would end up owing it."You can do it," said my mother," (4) , you won’t get much business until lunch. ""But I’ll never remember the orders, and I’m no good (5) money. Please, Mom, don’t (6) me."Then I’ll help you", she said.I shrugged my shoulders. I thought my mother’s (7) was a bad one, but I (8) .When I got to the bar the next day, I found my mother was (9) . Because the weather that day was rainy and cold, people wanted hot snacks and drinks. (10) , I was really slow at taking the orders and making change. The line of people grew, and everybody seemed (11) , I was so nervous that my hands shook, and I (12) a cup into pieces. What a mess! Then my mother came to (13) me, and she also showed me how to make (14) . If someone gave me $ 5 for something that cost $ 3.25, I handed over (15) quarters and a dollar and said, "75 cents makes four dollars, plus one dollar makes five. " Things went more (16) after that.By the end of the day, I could remember orders, (17) the bill, and make change quickly with a smile. I was even a little (18) when the sun came out and dried up business. My mother said she was proud of me, and when she (19) that I work at the snack bar again next year, I did not even shrug. I was too busy (20) the restaurant I would open one day.

 

第(7)空应选择()

A.idea

B.bar

C.day

D.answer

单项选择题 A1/A2型题