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Appendix E: Glossary
DNS
E-10
Psion Teklogix 9160 G2 Wireless Gateway User Manual
DNS
The Domain Name Service (DNS) is a general-purpose query service used for
translating fully-qualified names into Internet addresses. A fully-qualified name
consists of the hostname of a system plus its domain name. For example,
www
is the
host name of a Web server and
www.psionteklogix.com
is the fully-qualified name of that
server. DNS translates the domain name
www.psionteklogix.com
to some IP address, for
example
66.93.138.219
.
A domain name identifies one or more IP addresses. Conversely, an IP address may
map to more than one domain name.
A domain name has a suffix that indicates which top level domain (TLD) it belongs
to. Every country has its own top-level domain, for example
.de
for Germany,
.fr
for
France,
.jp
for Japan,
.tw
for Taiwan,
.uk
for the United Kingdom,
.us
for the U.S.A.,
and so on. There are also
.com
for commercial bodies,
.edu
for educational
institutions,
.net
for network operators, and
.org
for other organizations as well as
.gov
for the U. S. government and
.mil
for its armed services.
DOM
The Document Object Model (DOM) is an interface that allows programs and
scripts to dynamically access and update the content, structure, and style of
documents. The DOM allows you to model the objects in an HTML or XML
document (text, links, images, tables), defining the attributes of each object and how
they can be manipulated.
Further details about the DOM can be found at the W3C.
DTIM
The Delivery Traffic Information Map (DTIM) message is an element included in
some Beacon frames. It indicates which stations, currently sleeping in low-power
mode, have data buffered on the Access Point awaiting pick-up. Part of the DTIM
message indicates how frequently stations must check for buffered data.
Dynamic IP Address
See IP Address.