Lesson
15: The Internet
In this lesson, we’re going to discuss
the Internet. We’ll cover how the Internet has created
a new business model that’s changing how companies do
business today. We’ll look at intranets, extranets,
and e-commerce. Finally, we’ll look at the technology
implications of the new Internet applications such as the
need for higher bandwidth technologies and security.
The Agenda
- What Is the Internet?
- The
New Business Model
- Intranets
- Extranets
- E-Commerce
- Technology
Implications of Internet Applications
The Internet: A Network of Networks
What is the Internet? The Internet is the
following:
- A flock of independent networks flying
in loose formation, owned by no one and connecting an unknown
number of users
- A grass roots cultural phenomenon
started 30 years ago by a group of graduate students in tie-dyed
shirts and ponytails
- Ma Bell’s good old telephone
networks dressed up for the 1990s
A new way to transmit information
that is faster and cheaper than a phone call, fax, or the
post office
Some Internet facts:
- The number of hosts (or computers)
connected to the Internet has grown from a handful in 1989
to hundreds of millions today.
- The MIT Media Lab says that the size
of the World Wide Web is doubling every 50 days, and that
a new home page is created every
4 seconds.
Internet Hierarchy
The Internet has three components: information,
wires, and people.
- The “wires” are arranged
in a loose hierarchy, with the fastest wires located in the
middle of the cloud on one of
the Internet’s many “backbones.”
- Regional networks connect to the
Internet backbone at one of several Network Access Points
(NAPs), including MAE-EAST,
in Herndon, Virginia; and MAE-WEST, in Palo Alto, California.
- Internet service providers (ISPs)
administer or connect to the regional networks, and serve
customers from one or more points
of presence (POPs).
- Dynamic adaptive routing allows Internet
traffic to be automatically rerouted around circuit failures.
- Dataquest estimates that up to 88
percent of all traffic on the Internet touches a Cisco router
at some point.
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