Another information technology security device is the

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Another information technology security device is the proxy server. These devices are used as an intermediary between a personal computer and the Internet. They separate the enterprise network from the Internet or other outside networks. Proxy serv- ers are often used in tandem with firewalls. When they receive a request to access the Internet, they determine whether the user is allowed to make the request and then look to see if a copy of the requested web page is stored in cache. If the web page is stored in cache, it is sent to the user; otherwise, the server requests the page from the Internet. Terms & Concepts Cache Memory: Special high-speed random access memory that temporarily holds frequently used data or information. Firewall: A special-purpose software program or piece of com- puter hardware that is designed to prevent unauthorized access to or from a private network. Firewalls are often used to prevent unauthorized access to a private network from the Internet. Hacker: Although the term is used by some to refer to any clever programmer, it is used specifically to refer to an individual who attempts to break into a computer system without authorization. Information Technology: The use of computers, communica- tions networks, and knowledge in the creation, storage, and dispersal of data and information. Information technology com- prises a wide range of items and abilities for use in the creation, storage, and distribution of information. Local Area Network (LAN): Multiple computers that are located near each other and linked into a network that allows the users to share files and peripheral devices such as printers, fax machines, and storage devices. Metropolitan Area Network (MAN): Computer networks that transmit data and information citywide and at greater speeds than a local area network. Network: A set of computers that are electronically linked together. Security: The process of safeguarding and protecting the data, hardware, software, and processes of a business's information technology assets. Virus: In computer science, a virus is a program or piece of code that is loaded onto the computer without the user's knowl- edge and against the user's wishes that alters the way that the computer operates or that modifies the data or programs that are stored on the computer. Simple viruses can be self-replicating and use up a computer's memory or otherwise disable a com- puter; more complex viruses can transmit themselves across networks and bypass security systems to infect other computers or systems. Wide Area Network (WAN): Multiple computers that are widely dispersed and that are linked into a network. Wide area networks typically use high-speed, long- distance communications net- works or satellites to connect the computers within the network.
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