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ZyXEL X-550 User’s Guide
Client
A program or user that requests data from a server
Collision
When do two devices on the same Ethernet network try and transmit data at the exact same time.
Cookie
Information that is stored on the hard drive of your computer that holds your preferences to the site that
gave your computer the cookie
D
Data
Information that has been translated into binary so 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 request them
Digital certificate:
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