| 1.The purpose of the ( ) is to provide fully integrated analog services to users. |
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| 2.Computer （ ） is a complex consisting of two or more connected computing units， it is used for the purpose of data communication and resource sharing. |
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| 3.（ ） means the conducting of business communication and transaction over network and through computers． |
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| 4.With （ ） you can communicate in real time with people all around the world． |
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| 5.One use of networks is to let several computers share （ ） such as file system,printers,and tape drives. |
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| 6.Network software consists of （ ） , or rules by which processes can communicate. |
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| 7.Bitmap images use a grid of small squares known as （ ） to represent images． |
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| 8.A firewall is a （ ） system designed to protect an organization’s network against threats. |
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| 9.The display screen is the most common ( ) device used to show you what the computer is doing. |
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| 10.（ ）：Messages that are sent electronically over a network. |
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| 11.One of the basic rules of computer security is to change your （ ） regularly. |
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| 12.Multimedia includes ( ). |
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| 13.You might work for an organization whose computer system is spread ( ) a building. |
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| 14.Anti-Virus protects your computer from viruses by ( ) your computer's memory and disk devices. |
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| 15.Communication through the Internet, the ( ) performs the reverse function. |
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| 16.The ( ) is a collection of computers connected together by phone lines allows for the global sharing of information. |
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| 17.The OSI model has ( ) layers. |
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| 18.Multimedia will become increasingly ( ) throughout every aspect of our lives. |
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| 19.( ) is not a linear structure. |
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| 20.Which of the following expressions is true about the Internet? |
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