| 1.The Internet is the world's largest computer （ ）. |
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| 2.Communication through the Internet, the ( ) performs the reverse function. |
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| 3.Which of the following expressions is true about the Internet? |
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| 4.Virus is a ( ). |
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| 5.The source code of a Web page consists of ( ). |
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| 6.A firewall is a （ ） system designed to protect an organization’s network against threats. |
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| 7.The OSI model has ( ) layers. |
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| 8.Photoshop is the leading professional ( ) program, released by Adobe. |
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| 9.Networks, in terms of transmission technology, can be divided into ( ). |
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| 10.Network software consists of （ ） , or rules by which processes can communicate. |
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| 11.The firewall device is a （ ） system for connecting a computer network to other computer network. |
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| 12.Anti-Virus protects your computer from viruses by ( ) your computer's memory and disk devices. |
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| 13.( ) is not a linear structure. |
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| 14.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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| 15.Modem is ( ). |
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| 16.（ ）：Messages that are sent electronically over a network. |
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| 17.Bitmap images use a grid of small squares known as （ ） to represent images． |
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| 18.（ ） means the conducting of business communication and transaction over network and through computers． |
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| 19.( ) is a device that enables the computer to handle sounds. |
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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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