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Glossary
10BASE-T
IEEE 802.3 specification for 10 Mbps Ethernet over two pairs of Category
3, 4, or 5 UTP cable
100BASE-TX
IEEE 802.3u specification for 100 Mbps Fast Ethernet over two pairs of
Category 5 UTP cable
Asymmetric Digital Subscriber Line (ADSL)
ADSL allows more data to be sent over existing copper telephone lines than
analog or ISDN technologies. ADSL supports data rates up to8 Mbps
downstream rate and up to 640 Kbps upstream
Bandwidth
The difference between the highest and lowest frequencies available for
network signals. Also synonymous with wire speed, the actual speed of the
data transmission along the cable
Demilitarized Zone (DMZ)
A term taken from the military term for a safety zone between battle lines,
this refers to an area within the firewall. Often this is a single machine with
access to the internal site and the outside network
Denial of Service (DoS)
Action(s) that prevent any part of an information system from functioning
in accordance with its intended purpose. Usually flooding a system to
prevent it from servicing normal and legitimate requests
Domain Name Server (DNS)
An Internet service that translates domain names into IP addresses. Every
time you use a domain name, a DNS service must translate the name into
the corresponding IP address.
Dynamic DNS (DDNS)
A method/service which allows a DNS name to be constantly synchronized
with a dynamic IP address.
Dynamic Host Configuration Protocol (DHCP)