NetComm Gateway Series manual Dns

DHCP relay	Dynamic Host Configuration Protocol relay. A DHCP relay is a computer that
	forwards DHCP data between computers that request IP addresses and the DHCP
	server that assigns the addresses. Each of the My ADSL Modem’s interfaces can
	be configured as a DHCP relay. See DHCP.
DHCP server	Dynamic Host Configuration Protocol server. A DHCP server is a computer that is
	responsible for assigning IP addresses to the computers on a LAN. See DHCP.
digital	Of data, having a form based on discrete values expressed as binary numbers (0’s
	and 1’s). The data component in DSL is a digital signal. See also analog.
DNS	Domain Name System. The DNS maps domain names into IP addresses. DNS
	information is distributed hierarchically throughout the Internet among computers
	called DNS servers. When you start to access a web site, a DNS server looks up
	the requested domain name to find its corresponding IP address. If the DNS server
	cannot find the IP address, it communicates with higher-level DNS servers to
	determine the IP address. See also domain name.
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.netcomm.com.au. 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	Local area network traffic will be carried by standard Category 5 cable referred to
	as 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 ap-
	plied 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 intru-
	sion 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 con-
	nected 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 rout-
	ers 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.
SmartVoice Gateway(s) User Guide	85
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