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
5. Resident viruses frequently take over portions of the system software on the pc to hide their existence.
驻留性病毒很快占据PC的系统软件的位置以隐藏自己的存在。 Take over占据
6. Computer security is concerned with protecting information, hardware, and software.
电脑安全是与保护信息、硬件和软件有关的
concern with的意思是与什么有关，concern about 是指关心关注某事
7. Organizations need to determine and classify important information, such as the company’s financial information, employee data, etc, and establish different layers of security.
组织需要对重要信息决定和分类，比如公司的金融信息，聘用数据，等等，并设立不同的安全级别。
Such as 比如 etc是等等简写。
8. Most companies should take some effective measures of trying to keep software and data from being tampered with in the first place.
大部分的公司应该采取积极的措施，努力保护来自第一手（最初的）软件和数据，以免被干扰。
From来自
9. Application proxies, on the other hand, usually run on
standalone servers.
On the other hand另一方面
10. There are five levels of certification: Entry, Associate, Professional, Expert, and Architect, as well as seven different paths.
有五个等级的证书：入门级，助理级，专业级，专家级，架构师，同样也有七个不同的方向（路径）
As well as 也
11. The CCNA certification is earned upon passing the ICND1 640-822 and ICND2 640-816 exams.
CCNA证书是在ICND1 640-822和ICND2 640-816的考试。 Upon某某之上
12. In addition to CCNA exams, professionals must pass either four separate exams, or a composite exam along with two separate exams.
除了CCNA考试，专业级考试必须通过四个不同的考试，或者一科在四科分开的两次综合的考试。
Composite综合的
III. Translate the following into English
把以下的短语翻译成英文
1. 电子的 electronic 2. 数字的 numerical 3. 缺点 shortcoming 4. 随机的 random
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