Glossary
Cable Modem
A device that connects your PC to a local TV line and receives data at 1.5Mpbs.
One of its connections is connected to your PC and the other one is to the cable
wall outlet. It attaches a standard 10BASE-T ethernet card to a computer and
modulates between digital and analog signals.
DHCP
DHCP is a protocol for automatic IP configuration. Computers at client premise
can get one IP address from DHCP server automatically. Using DHCP can save
the effort for setting IP addresses on every LAN computer.
DMZ
Abbreviation for Demilitarized Zone. It is an area between a computer’s private
network and its outside public network. DMZ prevents the external users from
accessing directly to the server that contains company data.
Domain Name
A name that identifies one or more IP addresses. For example, the domain name
"microsoft.com" represents many IP addresses. Domain names are used in URLs
to identify particular Web pages. For example, in the URL http://www.pcwebope-
dia.com/index.html, the domain name is pcwebopedia.com.
DSL
DSL stands for Digital Subscriber Line. DSL transfers high-bandwidth information
and data to homes and small businesses through copper telephone lines. It is pre-
dicted to replace IDSN in bringing both motion, 3-D, voice and data signals to the
users.
Dynamic IP address
A dynamic IP address is an IP address that is given out automatically from a
DHCP Server to client computers or routers on a LAN or WAN.
Firewall
A set of related programs that protects inforamtions of private network users from
other networks.
Firmware
A program that is inserted into a programmable read-only memory to become a
computing device. It is created and tested like a software.
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Glossary
