Installation manual

Chapter 7: Glossary
Page 80
DHCP Dynamic Host Configuration Protocol
DHCP automates address assignment and management. When a computer
connects to the LAN, DHCP assigns it an IP address from a shared pool of
IP addresses; after a specified time limit, DHCP returns the address to the
pool.
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 Copper Jet’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 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. For example, www.yahoo.com is the domain name
associated with IP address 216.115.108.243. 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 domain name.
domain name A domain name is a user-friendly name used in place of its associated IP
address. 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. See 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 10BASE-T, 100BASE-T, twisted pair.
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.
Gbps Abbreviation of Gigabits per second, or one billion bits per second. Internet
data rates are often expressed in Gbps.
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 web browser, web site.