第52題： 下列無線網絡技術中，覆蓋范圍最小的是（）。
A、802.15.1藍牙
B、802.11n無線局域網
C、802.15.4 ZigBee
D、802.16m無線城域網
答案解析與討論：www.tronclassroom.com/st/418264974.html

第53題： 無線局域網中AP的輪詢會鎖定異步幀，在IEEE802.11網絡中定義了（）機制來解決這一問題。
A、RTS/CTS機制
B、二進制指數(shù)退避
C、超級幀
D、無爭用服務
答案解析與討論：www.tronclassroom.com/st/4182720634.html

第54題： RAID技術中，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：www.tronclassroom.com/st/4182811175.html

第56題： 以下關于網絡工程需求分析的敘述中，錯誤的是（）。
A、任何網絡都不可能是一個能夠滿足各項功能需求的萬能網
B、需求分析要充分考慮用戶的業(yè)務需求
C、需求的定義越明確和詳細，網絡建成后用戶的滿意度越高
D、網絡需求分析時可以先不考慮成本因素
答案解析與討論：www.tronclassroom.com/st/418307401.html

第57題： 下圖為某網絡工程項目的施工計劃圖，要求該項目7天內完工，至少需求投入（）人才能完成該項目（假設每個技術人員均能勝任每項工作）。

A、4
B、6
C、7
D、14
答案解析與討論：www.tronclassroom.com/st/4183111673.html

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
答案解析與討論：www.tronclassroom.com/st/4183220320.html