9. Wireless Network Glossary
DDNS
Dynamic Domain Name System. An algorithm that allows the use of dynamic IP address
for hosting Internet Server. A DDNS service provides each user account with a domain
name. A router with DDNS capability has a built-in DDNS client that updates the IP
address information to DDNS service provider whenever there is a change. Therefore,
users can build website or other Internet servers even if they don't have fixed IP
connection.
DHCP
Dynamic Hosting Configuration Protocol. A protocol that enables a server to dynamically
assign IP addresses. When DHCP is used, whenever a computer logs onto the network, it
automatically gets an IP address assigned to it by DHCP server. A DHCP server can
either be a designated PC on the network or another network device, such as a router.
DMZ
Demilitarized Zone. When a router opens a DMZ port to an internal network device, it opens
all the TCP/UDP service ports to this particular device. The feature is used commonly for
setting up H.323 VoIP or Multi-Media servers.
DNS
A program that translates URLs to IP addresses by accessing a database maintained on a
collection of Internet servers.
Domain Name
The unique name that identifies an Internet site. Domain Names always have 2 or more
parts, separated by dots. In www.airlive.com, the "airlive.com" is the domain name.
DoS Attack
Denial of Service. A type of network attack that floods the network with useless traffic.
Many DoS attacks, such as the Ping of Death and Teardrop attacks, exploit limitations in
the TCP/IP protocols.
Encryption
Encoding data to prevent it from being read by unauthorized people. The common
wireless encryption schemes are WEP, WPA, and WPA2.
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