| 1.The ( ) is a collection of computers connected together by phone lines allows for the global sharing of information. |
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| 2.The RGB value is composed of ( ) components. |
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| 3.( ) is used to communicate with another computer over telephone lines. |
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| 4.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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| 5.Multimedia includes ( ). |
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| 6.A （ ） copies a photograph,drawing or page of text into the computer. |
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| 7.Networks, in terms of transmission technology, can be divided into ( ). |
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| 8.One use of networks is to let several computers share （ ） such as file system,printers,and tape drives. |
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| 9.A firewall is a （ ） system designed to protect an organization’s network against threats. |
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| 10.Communication through the Internet, the ( ) performs the reverse function. |
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| 11.Network software consists of （ ） , or rules by which processes can communicate. |
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| 12.The display screen is the most common ( ) device used to show you what the computer is doing. |
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| 13.The firewall device is a （ ） system for connecting a computer network to other computer network. |
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| 14.Virus is a ( ). |
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| 15.( ) is not a linear structure. |
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| 16.One of the basic rules of computer security is to change your （ ） regularly. |
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| 17.Modem is ( ). |
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| 18.Which of the following expressions is true about the Internet? |
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| 19.The OSI model has ( ) layers. |
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| 20.The Internet is an open system, and most information is available to everyone. It is very important to add （ ） to existing system for protecting the secret information. |
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