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Terminology
194
for Assigned Names and Numbers (ICANN). Domain names are
a key element of URLs, which identify a specific file at a web site,
e.g., http://www.globespan.net/index.html. See also DNS.
download
To transfer data in the downstream direction, i.e., from the
Internet to the user.
DSL (Digital Subscriber Line)
A technology that allows both digital data and analog voice
signals to travel over existing copper telephone lines.
Ethernet
The most commonly installed computer network technology, usually
using twisted pair wiring. Ethernet data rates are 10 Mbps and
100 Mbps. See also BASE-T,100BASE-T, twisted pair.
filtering
To screen out selected types of data, based on filtering rules.
Filtering can be applied in one direction (upstream or downstream),
or in both directions.
filtering rule
A rule that specifies what kinds of data a routing device will accept
and/or reject. Filtering rules are defined to operate on an interface
(or multiple interfaces) and in a particular direction (upstream,
downstream, or both).
firewall
Any method of protecting a computer or LAN connected to the
Internet from intrusion or attack from the outside. Some firewall
protection can be provided by packet filtering and Network
Address Translation services.