Lesson Objective
1.1: Understand the concepts of the Internet, intranet, and
extranet. This objective may include but is not limited to: VPN,
security zones, firewalls.
Content
1. The
Internet has been called the “Information Superhighway.” Define the Internet
and discuss why you would agree or disagree with this alternative label for the
Internet.
Sample answer:
Internet: A worldwide computer network that allows people to communicate and
exchange information. The Internet is not owned by any particular company or
person.
Most students would probably agree with the label Information Superhighway,
citing such things as the global/international reach of the Internet, the
high-speed connections of the Internet’s backbone.
2. The
term extranet was coined by Mark Andreesen, a key developer of the early
Web browser Mosaic, in 1996. He was actually criticized by Network World . The
editorial stated that "... extranet is just a piece of marketing-speak
gobbledygook that some people with too much time on their keyboards and a lack
of inspiration are using" and ended with the statement, "an extranet
by any other name is still an intranet."
Define an intranet and an
extranet. Discuss your view of this editorial: do you think a single term
should be used or are both terms necessary?
Sample answer:
Intranet: A private network based on Internet protocols such as TCP/IP that is
strictly internal to the organization and is not connected to the Internet
directly. It is designed for information management within a company or
organization, and includes such services as specialized applications, document
distribution, software distribution, access to databases, and training.
Extranet: An extension of a corporate intranet using World Wide Web
technology to facilitate communication with the corporation’s suppliers,
customers, and business partners. An extranet allows limited access to a
company’s intranet in order to enhance the speed and efficiency of their
business relationship.
Yes, both terms are necessary—if we take net to mean network then intranet
means internal network and extranet means external network, which makes it
easier to understand how that type of network is being used.
Networking can be a complicated subject, so when you can capture the meaning of
something in a single word it helps the public grasp a concept in a simple way.
Yes, it can be a catchy marketing tool, but if it’s useful it will continue to
be used over time. Intranet and extranet have become useful words such that
they are now part of the networking lexicon.
3. Provide
a brief overview of each of the four basic features common to all VPN
connections.
Sample answer:
The four basic features common to all VPN
connections are:
Authentication: The process of assuring
the person who
is accessing the VPN is really the person who is authorized to use the system.
Authorization: The capability of limiting access to only authorized users
to the VPN.
Confidentiality: The capability of preventing anyone else from reading
the data outside of the VPN.
Data integrity: The process of ensuring the data that leaves the source and
arrives at the destination has not been tampered with while passing through the
VPN.
4. A
company wants to connect all employees’ computers so they can share information
without accessing the Internet—what type of network should they implement?
Sample answer:
An intranet would be the best network for this company.