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Appendix
57 D-Link Systems, Inc.
D
Data – Information that has been translated into binary do that it can be processed or moved to another device
Data Encryption Standard – Uses a randomly selected 56-bit key that must be known by both the sender and
the receiver when information is exchanged
Data-Link layer – The second layer of the OSI model. Controls the movement of data on the physical link of
a network
Database – Organizes information so that it can be managed updated, as well as easily accessed by users or
applications.
DB-25 – A 25 ping male connector for attaching External modems or RS-232 serial devices
DB-9 – A 9 pin connector for RS-232 connections
dBd - decibels related to dipole antenna
dBi - decibels relative to isotropic radiator
dBm - decibels relative to one milliwatt
Decrypt – To unscramble an encrypted message back into plain text
Default – A predetermined value or setting that is used by a program when no user input has been entered for
this value or setting
Demilitarized zone – DMZ. A single computer or group of computers that can be accessed by both users on
the Internet as well as users on the Local Network, but that is not protected by the same security as the Local
Network.
DHCP – Dynamic Host Configuration Protocol. Used to automatically assign IP addresses from a predefined
pool of addresses to computers or devices that requests them
Digital certificate – An electronic method of providing credentials to a server in order to have access to it or
a network
Direct Sequence Spread Spectrum – DSSS. Modulation technique used by 802.11b wireless devices
DNS – Domain Name System. Translates Domain Names to IP addresses
DOCSIS – Data Over Cable Service Interface Specifications. The standard interface for cable modems
Domain name – A name that is associated with an IP address
Download – To send a request from one computer to another and have the file transmitted back to the requesting
computer
DSL – Digital Subscriber Line. High bandwidth Internet connection over telephone lines
Duplex – Sending and Receiving data transmissions at the sane time
Dynamic DNS service – DDNS is provided by companies to allow users with Dynamic IP addresses to obtain
a Domain Name that will always by linked to their changing IP address. The IP address is updated by either
client software running on a computer or by a router that supports DDNS, whenever the IP address changes