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  3. 2014年05月网络工程师考试上午真题【基础知识】
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2014年05月网络工程师考试上午真题【基础知识】

【64-65】OSPF协议将其管理的网络划分为不同类型的若干区域(Area),其中标准区域特点是(64);存根区域(stub)的特点是(65)

真题详情及解析

【66-67】NAT技术解决了IPv4地址短缺的问题,假设内网的地址数是m,而外网地址数n,若m>n,则这种技术叫做(66),若m>n,且n=1,则这种技术这叫做(67)

真题详情及解析

【68-69】CIDR技术解决了路由缩放问题,例如2048个C类网络组成一个地址块,网络号从192.24.0.0~192.31.255.0这样的超网号应为(68),其地址掩码应为(69)

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【70】网络系统设计过程中,物理网络设计阶段的任务是(70)

真题详情及解析

【71-75】The traditional way of allocating a single channel among multiple competing users is to chop up its (71) by using one of the multiplexing schemes such as FDM (frequency division multiplexing). if there are n users, the bandwidth is divided into n equal-sized portions,with each user being assigned one portion. since each user has a private frequency (72), there is no interference among users.when there is only a small and constant number of users, each of which has a steady stream or a heavy load of (73), this division is a simple and efficient allocation mechanism. a wireless example is FM radio stations. each station gets a portion of the FM band and uses it most of the time to broadcast its signal.however, when the number of senders is large and varying or the traffic is (74), FDM presents some problems. if the spectrum is cut up into n regions while fewer than n users are currently interested in communicating, a large piece of valuable spectrum will be waste if more than n users want to communicate,some of them will be denied (75) for lack of bandwidth.

真题详情及解析
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