第52題： 下列無線網(wǎng)絡(luò)技術(shù)中，覆蓋范圍最小的是（）。
A、802.15.1藍(lán)牙
B、802.11n無線局域網(wǎng)
C、802.15.4 ZigBee
D、802.16m無線城域網(wǎng)
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第53題： 無線局域網(wǎng)中AP的輪詢會鎖定異步幀，在IEEE802.11網(wǎng)絡(luò)中定義了（）機(jī)制來解決這一問題。
A、RTS/CTS機(jī)制
B、二進(jìn)制指數(shù)退避
C、超級幀
D、無爭用服務(wù)
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第54題： RAID技術(shù)中，磁盤容量利用率最低的是（）。
A、RAID0
B、RAID1
C、RAID5
D、RAID6
答案解析與討論：m.xiexiliangjiufa.com/st/4182811175.html

第56題： 以下關(guān)于網(wǎng)絡(luò)工程需求分析的敘述中，錯(cuò)誤的是（）。
A、任何網(wǎng)絡(luò)都不可能是一個(gè)能夠滿足各項(xiàng)功能需求的萬能網(wǎng)
B、需求分析要充分考慮用戶的業(yè)務(wù)需求
C、需求的定義越明確和詳細(xì)，網(wǎng)絡(luò)建成后用戶的滿意度越高
D、網(wǎng)絡(luò)需求分析時(shí)可以先不考慮成本因素
答案解析與討論：m.xiexiliangjiufa.com/st/418307401.html

第57題： 下圖為某網(wǎng)絡(luò)工程項(xiàng)目的施工計(jì)劃圖，要求該項(xiàng)目7天內(nèi)完工，至少需求投入（）人才能完成該項(xiàng)目（假設(shè)每個(gè)技術(shù)人員均能勝任每項(xiàng)工作）。

A、4
B、6
C、7
D、14
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第58題： 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
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