题型有：1. 选择题
选择题（每小题1分，共75分）下列各题A、B、C、D四个选项中，只有一个选项是正确的，请将此选项涂写在答题卡相应位置上，答在试卷上不得分。
Although a given waveform may contain frequencies over a very broad range．as a practical matter any transmission system will be able to accommodate only a limited band of(71)．This，in turn，limits the data rate that can be carried on the transmission (72)．A square wave has an infinite number of frequency components and hence an infinite (73)．However，the peak amplitude of the kth frequency component，kf，is only 1／k，so most of the (74)in this waveform is in the first few frequency components．In general，any digital waveform will have(75)bandwidth．If we attempt to transmit this waveform as a signal over any medium，the transmission system will limit the bandwidth that can be transmitted.(2010年上半年试题)
1． (71)
A．frequencies
B．connections
C．diagrams
D．resources
正确答案：A 涉及知识点：计算机专业英语
2． (72)
A．procedures
B．function
C．route
D．medium
正确答案：D 涉及知识点：计算机专业英语
3． (73)
A．source
B．bandwidth
C．energy
D．cost
正确答案：B 涉及知识点：计算机专业英语
4． (74)
A．frequency
B．energy
C．amplitude
D．phase
正确答案：B 涉及知识点：计算机专业英语
5． (75)
A．small
B．1imited
C．infinite
D．finite
正确答案：C
解析：译文：虽然一个给定的波形包含了很宽的频率范围，但任何实际的传输系统只能通过有限的频率。这样，就限制了传输介质可以承载的数据速率。一个方波包含了无限多的频率成分，因而也具有无限的带宽。然而，第k个频率成分的峰值幅度kf只是1／k，所以波形的大部分能量只是包含在前面的少数频率成分中。一般来说，任何数字波形都有无限带宽。如果我们试图在某种介质上传输这种波形信号，则传输系统实际上会限制可以发送的带宽。 知识模块：计算机专业英语
Routing protocols use different techniques for assigning(1)to individual network．Further，each routing protocol forms a metric aggregation in a different way．Most routing protocols can use multiple paths if the paths has an equal(2)．Some routing protocols can even use multiple paths when paths have an unequal cost．In either case，load(3)can improve overall allocation of network bandwidth．When multiple paths are used，there are several ways to distribute the packets．The two most common mechanisms are per．packet load balancing and per—destination load balancing．Per—packet load balancing distributes the
(4)across the possible routes in a manner proportional to the route metrics．Per-destination load balancing distributes packets across the possible routes based on(5)．(2009年下半年试题)
6． (1)
A．calls
B．metrics
计算机四级网络工程师C．1inks
D．destinations
正确答案：B 涉及知识点：计算机专业英语
7． (2)
A．user
B．distance
C．entity
D．cost
正确答案：D 涉及知识点：计算机专业英语
8． (3)
A．bracketing
B．balancing
C．downloading
D．transmitting
正确答案：B 涉及知识点：计算机专业英语
9． (4)
A．destinations
B．resources
C．packets
D．sources
正确答案：C 涉及知识点：计算机专业英语
10． (5)
A．destinations
B．resources
C．packets
D．sources
正确答案：A
解析：译文：路由协议使用不同的技术来给独立的网络标记度量值。此外，每种路由协议以不同的形式形成度量聚集。如果路径有一个平等的成本，大多数路由协议可以使用多条路径。即使路径有一个不平等的成本，一些路由协议也可以使用多条路径。在任何情况下，负载均衡可以提高整体的网络带宽分配。当使用多条路径时，有几种方法分发数据包。最常见的两种机制是每个包负载平衡和按目的地负载平衡。每包负载均衡的方式分发数据包的速率与路由度量值成比例；按目的地负载平衡分发数据包是以目的地为依据的。 知识模块：计算机专业英语
The Border Gateway Protocol(BGP)is an interautonomous system (6)protocol．The primary function of a BGP speaking system is to exchange network(7)information with other BGP system．This network reachability information includes information on the list of
Autonomous System(Ass)that reachability information traverses．BGP-4 provides a new set of mechanisms for supporting(8)interdomain routing．These mechanisms include support for advertising an IP (9)and eliminate the concept of network class within BGP．BGP一4 also introduces mechanisms that allow aggregation of routes，including (10)of AS paths．These changes provide support for the proposed supemetting scheme．(2009年上半年试题)
发布评论