D-Link DWL-8500AP Product Manual - Page 157

Dynamic IP Address, IEEE 802.11, CSMA/CA, Lease Time, Gateway, Beacon, Access Point, IP Address

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Glossary detection whereas with CSMA/CA the emphasis is on collision avoidance. CTS A clear to send (CTS) message is a signal sent by an IEEE 802.11 client station in response to an request to send (RTS) message. The CTS message indicates that the channel is clear for the sender of the RTS message to begin data transfer. The other stations will wait to keep the air waves clear. This message is a part of the IEEE 802.11 CSMA/CA protocol. (See also RTS.) D DCF The Distribution Control Function is a component of the IEEE 802.11e Quality of Service (QoS) technology standard. The DCF coordinates channel access among multiple stations on a wireless network by controlling wait times for channel access. Wait times are determined by a random backoff timer which is configurable by defining minimum and maximum contention windows. See also EDCF. DHCP The Dynamic Host Configuration Protocol (DHCP) is a protocol specifying how a central server can dynamically provide network configuration information to clients. A DHCP server "offers" a "lease" (for a pre-configured period of time-see Lease Time) to the client system. The information supplied includes the client's IP addresses and netmask plus the address of its DNS servers and Gateway. DNS The Domain Name Service (DNS) is a generalpurpose query service used for translating fullyqualified names into Internet addresses. A fullyqualified 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.dlink.com is the fully-qualified name of that server. DNS translates the domain name www.dlink.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. E EAP The Extensible Authentication Protocol (EAP) is an authentication protocol that supports multiple methods, such as token cards, Kerberos, one-time passwords, certificates, public key authentication, and smart cards. 157

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Glossary
157
detection
whereas with CSMA/CA the emphasis is
on collision
avoidance
.
CTS
A
clear to send
(CTS) message is a signal sent by an
IEEE 802.11
client station in response to an
request
to send
(
RTS
) message. The CTS message indicates
that the channel is clear for the sender of the RTS
message to begin data transfer. The other stations
will wait to keep the air waves clear. This message is
a part of the IEEE 802.11
CSMA/CA
protocol. (See
also
RTS
.)
D
DCF
The
Distribution Control Function
is a component of
the IEEE 802.11e Quality of Service (QoS)
technology standard. The DCF coordinates channel
access among multiple stations on a wireless network
by controlling wait times for channel access. Wait
times are determined by a random backoff timer
which is configurable by defining minimum and
maximum contention windows. See also
EDCF
.
DHCP
The
Dynamic Host Configuration Protocol
(DHCP)
is a protocol specifying how a central server can
dynamically provide network configuration
information to clients. A DHCP server “offers” a
“lease” (for a pre-configured period of time—see
Lease Time
) to the client system. The information
supplied includes the client's IP addresses and
netmask plus the address of its
DNS
servers and
Gateway
.
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.dlink.com
is the
fully-qualified name of that server. DNS translates
the domain name
www.dlink.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
.
E
EAP
The
Extensible Authentication Protocol
(EAP) is an
authentication protocol that supports multiple
methods, such as token cards, Kerberos, one-time
passwords, certificates, public key authentication,
and smart cards.