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176 PUBLICNETWORKSconnectivity with value-added services such as Web
hosting and CDNs and are a good choice for many busi-
nesses.
In the future, only organizations with special require-
ments in the areas of performance, control, and security
will continue to maintain and install private networks.
Many organizations with private networks today will mi-
grate their private networks to public networks or use
VPNs via their Internet connection. Even organizations
that continue to have private networks will have at least
one connection to the one global public network called
the Internet to participate in activities such as e-mail and
E-commerce.GLOSSARY
Asynchronous transfer mode A network technology,
characterized by sending data in fixed size 53-byte cells
and offering various levels of service.
Asynchronous digital subscriber line A digital service
that uses ordinary telephone lines to connect a cus-
tomer to a public network. Asynchronous DSL has
download speeds that are much faster than the upload
speeds.
Content delivery network (CDN) A value-added ser-
vice that distributes the content to multiple locations
and closer to the end user. By sophisticated caching
schemes a CDN reduces response times.
Frame relay The most popular technology choice
within public switched data networks. Data are divided
into frames that are sent on switched networks.
Interexchange carrier A long-distance carrier in the
public switched telephone network system.
Internet service provider An organization that pro-
vides access to the Internet by providing an Internet
address and support of Internet protocols to the sub-
scriber.
Leased line A digital line that provides dedicated trans-
mission capacity between sites.
Local exchange carrier A carrier that controls traffic
within a single local access and transport area.
Public network A network that is publicly available to
subscribers. A public network can be under govern-
ment control, operate as a national monopoly, or can
be a privately owned network whose services are sold
to the public.
Private network A business network composed of
point-to-point leased lines between sites.
Public switched telephone network The network that
makes up the public telephone system.
Value-added carrier A network provider that provides
a value-added network.
Value-added network A network constructed by a net-
work provider that owns the packet-switching nodes
and leases transmission capacity to add value to the
network.
Value-added reseller A business that provides a service
(e.g., Web hosting) that requires network connectivity
and sells it for use with a particular public network
provider. The network provider often gives discounts
to the business for using the network.Virtual private network A network that uses a collec-
tion of technologies applied to the public network to
provide the same levels of privacy, security, quality of
service, and manageability as private networks.CROSS REFERENCES
SeeIntegrated Services Digital Network (ISDN): Narrow-
band and Broadband Services and Applications; Virtual
Private Networks: Internet Protocol (IP) Based; Wide Area
and Metropolitan Area Networks.REFERENCES
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