Chapter 1. Before You Start
Air Live IAS-2000 User’s Manual V1.0
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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.
Encryption key
An alphanumeric (letters and/or numbers) series that enables data to be encrypted and then decrypted so it can be
safely shared among members of a network. WEP uses an encryption key that automatically encrypts outgoing
wireless data. On the receiving side, the same encryption key enables the computer to automatically decrypt the
information so it can be read.
ESSID
The identifying name of an 802.11 wireless network. When you specify your correct ESSID in your client setup you
ensure that you connect to your wireless network rather than another network in range. (See SSID.) The ESSID can
be called by different terms, such as Network Name, Preferred Network, SSID or Wireless LAN Service Area.
