| Intranet/Extranet
Definitions |
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Internet
The Internet is the public, global network
of networks that is based on the Internet Protocol (IP) and related
standards. This technology was designed to provide a standard means
of interconnecting networks so that any system could communicate
with any other system. It operates as a confederated network of
networks (an "Internet"), and offers universal accessibility.
The term often includes the World Wide Web, a powerful, standard
facility for network-based publishing, as well as electronic mail,
and the growing suite of other network applications that are based
on Internet communications. Standardisation and wide acceptance
of the Internet has stimulated many billions of dollars of broadly
applicable software and network development.
Intranet
An intranet is a private application of the
same internetworking technology, software, and applications within
a private network, for use within an enterprise or company. It may
be entirely disconnected from the public Internet, but is usually
linked to it and protected from unauthorized access by security
firewall systems. More loosely, the term may include extranets,
as well.
Extranet
An extranet is a use of Internet/Intranet
technology to serve an extended enterprise, including defined sets
of customers or suppliers or other partners. It is typically behind
a firewall, just as an intranet usually is, and closed to the public
(a "closed user group"), but is open to the selected partners,
unlike a pure intranet. More loosely, the term may apply to mixtures
of open and closed networks.
Summary
What is more useful (but not yet common)
is to think of intranets and extranets as classes of applications:
intranet, extranet, and public Internet applications will all run
on the same network infrastructure, but their content (program and
data) resources will be administered for different levels of accessibility
and security.
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