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文库首页网络技术网络基础计算机网络练习题（含答案）

计算机网络练习题（含答案）

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计算机网络课后习题，含答案 Chapter 1: Introduction and Overview Chapter 2: Network Classification Chapter 3: Network Architectures and Standards。。。。 Chapter 19: Network Management and Operation

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Chapter 1: Introduction and Overview

Fill In the Blank

1-1. The transmitter or sender of a message is also called the _____.

1-2. The vehicle through which a message travels from sender to receiver is called the

_____.

1-3. A set of rules that guide the progress of a message from sender to receiver is called a

_____.

1-4. The company that passed up the opportunity to own the basic patents on the

telephone was _____.

1-5. Signals that are continuous are called _____.

1-6. Signals that have discrete values are called _____.

1-7. A process that allows information to pass between a sender and one or more

receivers is called _____.

1-8. A copper wire in a telephone network is an example of a _____.

1-9. The first printing telegraph system used the _____ code.

1-10.When an analog signal is converted to digital form it is said to be _____.

True or False

1-1. The telephone network totally and quickly eliminated the need for teleprinting

networks and services.

1-2. Protocols are never used in voice communication.

1-3. The switching of data, voice, and other signals through a network is done by

specialized computers.

1-4. If you tapped into a digital communications circuit, you would be able to tell whether

the signals you saw were computer data, digitized voice signals, or digitized video.

1-5. Alexander Graham Bell was instantly successful with telephone technology after he

received the patent for his device.

1-6. Analog communications devices handle signals that vary discretely with time.

1-7. Computers are the only devices that can handle switching in networks.

1-8. The communications regulatory environment changes constantly.

1-9. There are fundamental differences among data, voice, and image transmissions.

1-10.To qualify as a network, the devices that are interconnected must be of different

types and use multiple technologies.

1-11.A communication circuit is only implemented using copper wire or optical fiber.

1-12.Private companies are not allowed to build their own communications networks.

1-13.Alexander Graham Bell offered to sell his patent for the telephone to Siemens

Electronics of Germany but the company declined his offer.

1-14.Teleprinter signals could never be transmitted by radio because of the speed at which

humans type.

1-15.The average time to connect a telephone call is under three seconds.

1-16.Most telephone handsets are analog devices.

1-17.When an analog voice signal is converted to digital form, it is said to be digitized.

1-18.When you make a call on your cell phone, you are using a wireless network.

1-19.The first true telecommunications network was established in the United Sates over

150 years ago.

1-20.Telex service is still in limited use today.

Multiple Choice

1-1. Rules that guide the progress of messages through a network are called _____.

a. media

b. circuits

c. switches

d. protocols

e. sinks

1-2. A teleprinter is a _____.

a. talking typewriter

b. device that switches analog signals

c. successor to the telephone

d. personal computer printer connected by infrared signals

e. None of the above.

1-3. In the telephone system, a computer in a central office _____.

a. switches calls between telephones

b. totally eliminates the need for telephone operators

c. only exists to handle billing and administrative tasks

d. is no longer required in modern telephone networks

1-4. Networks that connect computers _____.

a. eliminate the need for wires between the computers

b. are never used in banks for security reasons

c. are rarely found in hospitals because of the potential of radiation exposure

d. never have sources or sinks

e. do not require protocols

f. None of the above.

1-5. Telephone signals are _____.

a. normally converted to digital form at some point during their transmission

b. switched by computers

c. transmitted through a communication company’s CO

d. All of the above.

e. None of the above.

1-6. Basic elements of a network are called the _____.

a. telephone, telegraph, and personal computer

b. personal computer, modem, and Internet

c. source, medium, and sink

d. line, circuit, and cable

e. hardware, software, and firmware

1-7. Two pioneers of the telephone industry were _____ and _____.

a. Bell and Gray

b. Morse and Code

c. Baudot and Murray

d. Rowe and Schuh

e. Black and White

1-8. Digital signals, as shown in Figure 1-5 ___________.

a. have many levels and a gradual change between them

b. represent the 1 bit and the 2 bit

c. have just two states

d. None of the above.

1-9. Networks you may have used include ___________.

a. the public switched telephone network (PSTN)

b. the Internet

c. a bank network

d. a supermarket network

e. a credit card network

f. All of the above.

1-10. The telex and TWX networks were ___________.

a. different names for the same service

b. both developed in the U.S.

c. rarely used because cell phones became available

d. early telephone services

e. None of the above.

1-11. An example of a communications medium is ___________.

a. a telephone

b. a personal computer

c. a teleprinter

d. a copper wire

e. None of the above.

1-12. To use a network you must always___________.

a. be a registered user

b. have a password

c. have basic PC skills

d. All of the above.

e. None of the above.

Chapter 2: Network Classification

FILL IN THE BLANK

2-1. A communications _____ is an interconnected system of computers, terminals, and

other hardware established for the purpose of exchanging information or services

between individuals, groups, or institutions.

2-2. A _____ on a network is a point of connection into a network, such as a computer

terminal, or a point, such as a router or a switch, at which one or more transmission lines

(circuits) interconnect.

2-3. Three ways that networks can be classified are _____, _____, and _____.

2-4. A _____ _____ network covers a small geographic area such as an office of a

campus.

2-5. A _____ _____ network covers a large geographic area such a s a state, country, or

may even be global.

2-6. A _____ _____ network covers an intermediate area, such as a city and usually links

several LANS.

2-7. A _____ _____ network usually crosses public rights of way.

2-8. A _____ _____ network frequently uses a bus topology.

2-9. A _____ _____ network usually uses circuits provided by one or more

communication carriers.

2-10. A _____ _____ network could be installed in a home.

2-11. _____ _____ is the primary reason that fully interconnected mesh networks are

rarely installed.

2-12. A _____ network is usually a high-speed network that links other networks

together. It may be a MAN that links LANS at several locations of a university, or a high

speed circuit linking several offices of a company.

2-13. _____ _____ is optical fiber that has been installed (typically in the ground) but

which does not have the necessary electronics installed at each end to make it usable.

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