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Glossary of Terms
271
Term
Definition
Daemon
A program that runs continuously in the background, or is activated by a particular
event (for example, an error may trigger Syslog). The word daemon is Greek for “spirit”
or “soul.” See also, SYSLOG.
DAT
(Dynamic Address Translation) Nomadix Gateways provide “plug-and-play” access to
subscribers who are misconfigured with static (permanent) IP addresses, or subscribers
that do not have DHCP functionality on their computers. DAT is a Nomadix, Inc.
patented technology that allows all users to obtain network access, regardless of their
computer’s network settings. See also, DHCP.
DHCP
(Dynamic Host Configuration Protocol) A standard method for assigning IP addresses
automatically to devices connected on a TCP/IP network. When a new device connects
to the network, the DHCP server assigns an IP address from a list of its available
addresses. The device retains this IP address for the duration of the session. When the
device disconnects from the network, the IP address becomes available for
reassignment to another device. See also, Dynamic IP Address, IP Address, Static IP
Address, and TCP/IP.
DNS
(Domain Name System) A system that maps meaningful domain names with complex
numeric IP addresses. See also, Domain Name and IP Address.
Domain Name
A unique and meaningful name representing each addressable computing device on a
dynamic network (for example, the Internet). Some devices have more than one domain
name. When a user types a domain name, requesting a connection to the device, DNS
converts the domain name into a numeric IP address. The location of the device on the
network is known by its IP address. WWW.YAHOO.COM is an example of a commercial
domain name on the World Wide Web. See also, DNS, Internet, and IP Address.
Driverless Print
Servers
Servers that can bill subscribers’ rooms for printing their documents without them
having to install printers. See also, Print Billing Command.
DSSS
(Direct Sequence Spread Spectrum) One of two types of spread spectrum radio—the
other being Frequency Hopping Spread Spectrum (FHSS). DSSS is a transmission
technology used in WLAN transmissions where a data signal at the sending station is
combined with a higher data rate bit sequence, or “chipping” code, that divides the user
data according to a spreading ratio. The chipping code is a redundant bit pattern for
each bit that is transmitted, which increases the signal's resistance to interference. If one
or more bits in the pattern are damaged during transmission, the original data can be
recovered due to the redundancy of the transmission.
DTIM
(Delivery Traffic Indication Message) A message included in data packets that can
increase wireless efficiency.
Dynamic IP
Address
A temporary IP address that is assigned by the DHCP server to a device. Devices retain
dynamic IP addresses only for the duration of their networking session. When a device
disconnects from the network, the IP address is recaptured by the DHCP server and
becomes available for reassignment to another device. See also, DHCP, IP Address, IP
Address Translation, Static IP Address, and Translation.
EAP
(Extensible Authentication Protocol) An extension to PPP. EAP is a general protocol for
authentication that also supports multiple authentication methods (for example, public
key authentication and smart cards). IEEE 802.1x specifies how EAP should be
encapsulated in LAN frames. In wireless communications using EAP, a user requests
connection to a WLAN through an AP, which then requests the identity of the user and
transmits that identity to an authentication server such as RADIUS. The server asks the
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