第52题： 下列无线网络技术中，覆盖范围最小的是（）。
A、802.15.1蓝牙
B、802.11n无线局域网
C、802.15.4 ZigBee
D、802.16m无线城域网
答案解析与讨论：www.cnitpm.com/st/418264974.html

第53题： 无线局域网中AP的轮询会锁定异步帧，在IEEE802.11网络中定义了（）机制来解决这一问题。
A、RTS/CTS机制
B、二进制指数退避
C、超级帧
D、无争用服务
答案解析与讨论：www.cnitpm.com/st/4182720634.html

第54题： RAID技术中，磁盘容量利用率最低的是（）。
A、RAID0
B、RAID1
C、RAID5
D、RAID6
答案解析与讨论：www.cnitpm.com/st/4182811175.html

第56题： 以下关于网络工程需求分析的叙述中，错误的是（）。
A、任何网络都不可能是一个能够满足各项功能需求的万能网
B、需求分析要充分考虑用户的业务需求
C、需求的定义越明确和详细，网络建成后用户的满意度越高
D、网络需求分析时可以先不考虑成本因素
答案解析与讨论：www.cnitpm.com/st/418307401.html

第57题： 下图为某网络工程项目的施工计划图，要求该项目7天内完工，至少需求投入（）人才能完成该项目（假设每个技术人员均能胜任每项工作）。

A、4
B、6
C、7
D、14
答案解析与讨论：www.cnitpm.com/st/4183111673.html

第58题： Network security consists of policies and practices to prevent and monitor (1) access,misuse, modification, or denial of a computer network and network-accessible resources.Network security involves the authorization of access to data in a network, which is controlled by the network（2).Users choose or are assigned an ID and password or other authenticating information that allows them to access to information and programs within their authority.Network security secures the network, as well as protecting and overseeing operations being done. The most common and simple way of protecting a network resource is by assigning it a (3) name and a corresponding password. Network security starts with authentication. Once authenticated,a（4）enforces access policies such as what services are allowed to be accessed by the network users.Though effective to prevent unauthorized access, this component may fail to check potentially harmful content such as computer(5)or Trojans being transmitted over the network.
(1) A、unauthorized
B、harmful
C、dangerous
D、frequent
(2) A、user
B、agent
C、server
D、administrator
(3) A、complex
B、unique
C、catchy
D、long
(4) A、firewall
B、proxy
C、gateway
D、host
(5) A、spams
B、malwares
C、worms
D、programs
答案解析与讨论：www.cnitpm.com/st/4183220320.html