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(wù)
答案解析與討論：www.xomuzic.com/st/4182720634.html

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：www.xomuzic.com/st/4182811175.html

第55題： 三層網(wǎng)絡(luò)設(shè)計方案中，（）是匯聚層的功能。
A、不同區(qū)域的高速數(shù)據(jù)轉(zhuǎn)發(fā)
B、用戶認證、計費管理
C、終端用戶接入網(wǎng)絡(luò)
D、實現(xiàn)網(wǎng)絡(luò)的訪問策略控制
答案解析與討論：www.xomuzic.com/st/4182926020.html

第57題： 下圖為某網(wǎng)絡(luò)工程項目的施工計劃圖，要求該項目7天內(nèi)完工，至少需求投入（）人才能完成該項目（假設(shè)每個技術(shù)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.xomuzic.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.xomuzic.com/st/4183220320.html