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Firewall: A program or set of programs designed to keep unauthorized users or messages from accessing a private network. The firewall usually has rules or protocols that authorize or prohibit outside . . . View Full Definition

Undernet: An alternative IRC which is accessed through a normal, or public, chat area. Its access is limited, and it is usually used for private conversations. But be warned: unless you are behind a s . . . View Full Definition

Proxy Server: A server that acts as an intermediary between a workstation user and the internet so that the enterprise can ensure security, administrative control, and caching service. A proxy server is a . . . View Full Definition

Intranet: A private network for communications and sharing of information that, like the Internet, is based on TCP/IP but is accessible only to authorized users within an organization. An organization . . . View Full Definition

Extranet: An extranet is similar to an intranet. They both use Internet protocols. The difference is that the extranet is designed to give a certain amount of access to outside users where an intranet . . . View Full Definition