| 1.One of the basic rules of computer security is to change your （ ） regularly. |
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| 2.One of the greatest features of a home （ ） is the ability to share one Internet connection simultaneously over two or more computers. |
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| 3.Network software consists of （ ） , or rules by which processes can communicate. |
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| 4.( ) is a device that enables the computer to handle sounds. |
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| 5.( ) is used to communicate with another computer over telephone lines. |
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| 6.A （ ） computer is a personal computer whose hardware is capable of using any or all of the following media in a program : audio,text,graphics,video and animation. |
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| 7.Multimedia will become increasingly ( ) throughout every aspect of our lives. |
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| 8.（ ）：Messages that are sent electronically over a network. |
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| 9.Communication through the Internet, the ( ) performs the reverse function. |
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| 10.Anti-Virus protects your computer from viruses by ( ) your computer's memory and disk devices. |
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| 11.Bitmap images use a grid of small squares known as （ ） to represent images． |
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| 12.A firewall is a （ ） system designed to protect an organization’s network against threats. |
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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.The Internet is the world's largest computer （ ）. |
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| 15.Photoshop is the leading professional ( ) program, released by Adobe. |
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| 16.Most （ ） measures involve data encryption and password. |
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| 17.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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| 18.Modem is ( ). |
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| 19.Virus is a ( ). |
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| 20.The OSI model has ( ) layers. |
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