How traffic moves over
Group Web Presentation week12
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The Internet is a global system of interconnected
computer networks that interchange data by
packet switching using the standardized Internet
Protocol Suite (TCP/IP).
Internet is moved by such a part.
Modem (from modulator-demodulator) is a
device that modulates an analog carrier signal
to encode digital information.
For most of us, the Internet starts at our modem.
When your modem dials into your Internet ser-
vice provider, it connect to a special router called
an access cocentrator, located at the ISP's Point
of presence (POP).
High-speed leased lines connect the POPs to the
ISP's main data center.
Large ISPs such as EarthLink and AOL may have
thousands of POPs located around the World.
Most ISPs provide free email service for their
Each ISP must have a high-speed connection to
one of the major Internet backbones.
These are very high-speed fiber-optic connections
that link major ISP data centers, universities and
government agencies. All the major backbones are
interconnected, so that if one fails, the others
automatically pick up the traffic.
Web service is a software system designed to
support interoperable machine-to-machine
interaction over a network.
The internet wouldn't be very interesting without
content, and most of that content comes from
ISPs often provide free hosting services for their
users, and many business host their own Web
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