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Jargon Demystified 

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 
 
Firewall 
A security system that prevents computers on a network from communicating directly with computers on another network. Instead, all communication is routed through a proxy server, which determines whether a particular message or file may pass to or from the host.. 
 
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Telephone System Maintenance 
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