Nortel Networks NB5PLUS4/W - Manual (Page 101)

YML754 Rev1 NB5Plus4/W User Guide
www.netcomm.com.au 101
domain­ n­ame A domain name is a user-friendly name used in place of
its associated IP address. For example, www.globespan.
net is the domain name associated with IP address
209.191.4.240. Domain names must be unique; their
assignment is controlled by the Internet Corporation 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 dig-
ital data and analog voice signals to travel over existing
copper telephone lines.
Ethern­et The most commonly installed computer network technol-
ogy, 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 filter-
ing and Network Address Translation services.
FTP File Transfer Protocol - A program used to transfer files
between computers connected to the Internet. Common
uses include uploading new or updated files to a web
server, and downloading files from a web server.
GGP Gateway to Gateway Protocol. An Internet protocol that
specifies how gateway routers communicate with each
other.
Gbps Abbreviation for Gigabits (GIG-uh-bits) per second, or
one billion bits per second. Internet data rates are often
expressed in Gbps.
GRE Generic Routing Encapsulation. TCP/IP protocol suite,
transport layer encapsulation protocol.
hop When you send data through the Internet, it is sent first
from your computer to a router, and then from one router
to another until it finally reaches a router that is directly
connected to the recipient. Each individual “leg” of the
data’s journey is called a hop.
hop coun­t The number of hops that data has taken on its route to its