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Glossary
EN/LZT 108 6492 R2 - October 2003
119
Broadband
A telecommunications technology that can send different types of data over
the same medium. DSL is a broadband technology.
Broadcast
To simultaneously send the same message to multiple recipients.
- C -
CHAP
Short for Challenge Handshake Authentication Protocol. A type of
authentication in which the authentication agent (typically a network server)
sends the client program a random value that is used only once and an ID
value. Both the sender and peer share a predefined secret.
- D -
Device
Any
machine or component that attaches to a computer. Examples of
devices include disk drives, printers, mice and modems.
DHCP
Short
for Dynamic Host Configuration Protocol, which is a protocol for
assigning dynamic IP addresses to devices in a network. With dynamic
addressing, a device can have a different IP address every time it connects
to the network. Many ISPs use dynamic IP addressing for dial-up users.
DHCP 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.
DHCP Server
A DHCP server is a computer that is responsible for assigning IP
addresses to the computers on a LAN. See also DHCP.
DMZ
A Demilitarized Zone is used by a company that wants to host its own
Internet services without sacrificing unauthorized access to its private
network. The DMZ sits between the Internet and an internal network's line
of defense, usually some combination of firewalls and bastion hosts.
DNS
Short for Domain Name System (or Service), an Internet service that
translates domain names into IP addresses. Because domain names are
alphabetic, they're easier to remember. The Internet however, is really
based on IP addresses. Every time you use a domain name, therefore, a
DNS service must translate the name into the corresponding IP address.