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run more than one DHCP server on your network, you will experience network errors, such as conflicting IP
addresses.
Diversity Antenna
A type of antenna system that uses two antennas to maximize reception and transmission quality and reduce
interference.
DMZ
Demilitarized Zone. A computer or small subnetwork that sits between a trusted internal network, such as a
corporate private LAN, and an distrusted external network, such as the public Internet.
Typically, the DMZ contains devices accessible to Internet traffic, such as Web (HTTP) servers, FTP servers, SMTP
(e-mail) servers and DNS servers.
The term comes from military use, meaning a buffer area between two enemies.
DNS
A program that translates URLs to IP addresses by accessing a database maintained on a collection of Internet
servers. The program works behind the scenes to facilitate surfing the Web with alpha versus numeric addresses. A
DNS server converts a name like mywebsite.com to a series of numbers like 107.22.55.26. Every website has its
own specific IP address on the Internet.
Domain Name
The unique name that identifies an Internet site. Domain Names always have 2 or more parts, separated by dots.
The part on the left is the most specific, and the part on the right is the most general. A given machine may have
more than one Domain Name but a given Domain Name points to only one machine.
DoS Attack
A type of attack on a network that is designed to bring the network to its knees by flooding it with useless traffic.
Many DoS attacks, such as the Ping of Death and Teardrop attacks, exploit limitations in the TCP/IP protocols. For
all known DoS attacks, there are software fixes that system administrators can install to limit the damage caused by
the attacks. But, like viruses, new DoS attacks are constantly being dreamed up by hackers.
Download
To receive a file transmitted over a network.
DTIM
Delivery Traffic Indication Message. A message included in data packets that can increase wireless efficiency.
Dynamic IP Address
A temporary IP address assigned by a DHCP server.
Encryption
Encoding data to prevent it from being read by unauthorized people.
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