DHCP server Dynamic Host Conguration Protocol server
A DHCP server is a computer that is responsible for assigning
IP addresses to the computers on a LAN. SeeDHCP.
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. Seeanalog.
DNS Domain Name System
The DNS maps domain names into IP addresses. DNS in-
formation 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 nd its
corresponding IP address. If the DNS server cannot nd the
IP address, it communicates with higher-level DNS servers to
determine the IP address. Seedomainname.
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 As-
signed Names and Numbers (ICANN). Domain names are a
key element of URLs, which identify a specic le at a web
site. SeeDNS.
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.
encryption keys See networkkeys
Ethernet The most commonly installed computer network technology,
usually using twisted pair wiring. Ethernet data rates are
10 Mbps and 100 Mbps. Seealso10BASE-T,100BASE-T,
twistedpair.
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