Netcom NB9 - Manual (Page 77)

NB9/NB9W ADSL+ VoIP Router 77
YML790 Rev8
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.
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 destination. Alternatively, the maximum number of hops that
a packet is allowed to take before being discarded , See also TTL.
host A device (usually a computer) connected to a network.
HTTP Hyper-Text Transfer Protocol HTTP is the main protocol used to transfer data from web sites so that it can be displayed
by web browsers. See also web browser
ICMP Internet Control Message Protocol An Internet protocol used to report errors and other network-related information. The
ping command makes use of ICMP.
IGMP Internet Group Management Protocol An Internet protocol that enables a computer to share information about its
membership in multicast groups with adjacent routers. A multicast group of computers is one whose members have
designated as interested in receiving specific content from the others. Multicasting to an IGMP group can be used to
simultaneously update the address books of a group of mobile computer users or to send company newsletters to a
distribution list.
in-line filter See Microfilter
Internet
The global collection of interconnected networks used for both private and business communications.
intranet A private, company-internal network that looks like part of the Internet (users access information using web browsers),
but is accessible only by employees.
IP See TCP/IP.
IP address Internet Protocol address The address of a host (computer) on the Internet, consisting of four numbers, each from 0 to
255, separated by periods, e.g., 209.191.4.240. An IP address consists of a network ID that identifies the particular
network the host belongs to, and a host ID uniquely identifying the host itself on that network. A network mask is
used to define the network ID and the host ID. Because IP addresses are difficult to remember, they usually have an
associated domain name that can be specified instead. See also domain name, network mask.
ISP Internet Service Provider A company that provides Internet access to its customers, usually for a fee.
LAN Local Area Network A network limited to a small geographic area, such as a home, office, or small building.
LED Light Emitting Diode An electronic light-emitting device. The indicator lights on the front of the My ADSL Modem are
LEDs.
MAC address Media Access Control address The permanent hardware address of a device, assigned by its manufacturer. MAC
addresses are expressed as six pairs of characters.
mask See network mask.
Mbps Abbreviation for Megabits per second, or one million bits per second. Network data rates are often expressed in Mbps.