Internet service provider (ISP)
is a commercial
organization with a permanent connection to the Internet that sells temporary
connections to retail subscribers. EarthLink, NetZero, AT&T, and Time Warner
are ISPs. Individuals also connect to the Internet through their business firms,
universities, or research centers that have designated Internet domains.
There are a variety of services for ISP Internet connections. Connecting via a
traditional telephone line and modem, at a speed of 56.6 kilobits per second
(Kbps) used to be the most common form of connection worldwide, but it has
been largely replaced by broadband connections. Digital subscriber line (DSL),
cable, satellite Internet connections, and T lines provide these broadband
services.
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Part Two
Information Technology Infrastructure
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