Definition: Technically, it only takes two computers, or hosts, to form a network. A network is any two or more computers connected together to share data or resources. Common network resources are things like printers that may be shared by many users rather than each user having their own printer. The Internet is one large network of shared data and resources.
Network
From Tony Bradley, CISSP-ISSAP, for About.com
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Explore Internet / Network Security
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