每一台电脑或共享设备在网络上被称为——。A是服务器，B是工作站，C是网络节点，D是网桥
15. A B is a special computer on a network that provides & controls services(resources) for other computers on the network to use.
A. workstation B. server C. bridge D. switch
在网络上_____是一台特殊的电脑，专门为其他计算机提供和控制网络的使用。 B是服务器
16. A have limited access to the resources found on the network.
A. Client B. Administrator C. Nodes D. servers
译：_____已经被限制访问网络上的资源。 A是客户，B是超级管理员 C是节点 D是服务器
17. Every network has a “shape” which is normally referred to as its B .
A. bus B. topology C. star D. tree
每一个网络有一种“形状”，通常指的是_____. A是总线（型），公车 B是拓扑结构，C是星型 D是树形。故选 B
18. In a C , each device has its own cable run connecting the device to a common hub or concentrator.
A. Bus B. Mesh C. Star D. Tree
译：在____中，每一个设备都有自己专门的线连接共同的中继器或者集线器。 A是总线形，B是网形，C是星形 D是树形
19. NICs are considered Layer 2 devices because each individual NIC throughout the world carries a unique code, called D . A. binary impulses B. serial format
C. code of network interface card D. Media Access Control Address
译：网卡被认为是第二层设备因为每一块单独的网卡上都有通过网络世界的独一无二的编码被称为_____.
A是二进制脉冲 B是版本系列，格式系列. C是网卡序列号 D是MAC地址
20. One of the disadvantages of the type of cable that we primarily use, CAT 5 UTP, is C . A. the cost of this kind of medium B. different installation C. cable length D. it’s too complicated
译：我们主要使用的线缆类型，CAT5类非屏蔽双姣线的缺点之一是______。A是种类之间的花费 B是不同的安装 C是线缆长度 D太复杂了 据我们所知5类非屏蔽双姣线的使用最大只能是100米。故选线缆长度。
21. Consequently, bridges are concerned only with passing or not passing frames, based on C .
A. internet protocol address B. logical address C. the destination MAC address D. the format of the frame
译：通常地，网桥是基于______协商通过或不通过框架。 A是IP地址 B是逻辑地址 C是目标MAC地址 D是框架的结构 网络知识不解释。
22. The purpose of a router is to examine incoming packets, choose the best path for them through the network, and C . A. then let them wait there for some time
B. then change the information coming from the application layer
C. then switch them to the proper outgoing ports D. then put them to another router
译：路由器的目的是审查进来的数据包，选择最佳路径让数据通过网络，然后______。A是让它们等待一段时间 B是在应用层改变信息 C是帮它们选择合适的出端口 D是把他们放到其他路由器
23. A is the best transfer media at present.
A. Optical fiber B. Coaxial cable C. Twisted pair D. Radio
译：目前_____是传输最好的介质。A是光纤 B是同轴电缆 C是双姣线 D是无线电
24. D can select the best path to route a message. A. NIC B. Bridge C. Switch D. Router
译：_____可以选择最佳的路径路由信息。A网卡 B网桥 C交换机 D路由器
II. Fill in the blanks with the proper word.
用恰当的词填空
1. Only connect devices when the computer is turned off. 只有当电脑关机的时候才能连接硬件设备（不考虑热拔插） turn off 关机
2. C language was developed in the Bell laboratory in the beginning of the 1970’s.
C语言是在1970年初期在贝尔实验室开发的。in the
3. A network is an interconnected system of computers that can communicate with each other and share files, data and network resources.
beginning of在开始的。无in the begin of.
网络是连接电脑系统与其他电脑共享文件、数据、网络资源的。 在这里other相当于other computer
4. Virus writers want their programs to spread as far as possible.
病毒编写者希望他们的程序能尽可能远地传播。
As far as possible尽可能远
