Bedienungsanleitung Netgear WPN824 (Seite 163 von 174) (Englisch)

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Reference Manual for the RangeMax Wireless Router WPN824

Glossary

202-10072-01, March 2005

CSMA/CD (Carrier Sense Multiple Action/Collision Detection)

A method of managing traffic and reducing noise on an Ethernet network. A network device transmits data

after detecting that a channel is available. However, if two devices transmit data simultaneously, the sending

devices detect a collision and retransmit after a random time delay.

DHCP (Dynamic Host Configuration Protocol)

A utility that enables a server to dynamically assign IP addresses from a predefined list and limit their time

of use so that they can be reassigned. Without DHCP, an IT Manager would have to manually enter in all the

IP addresses of all the computers on the network. When DHCP is used, whenever a computer logs onto the

network, it automatically gets an IP address assigned to it.

Diversity: antenna

A type of antenna system that uses two antennas to maximize reception and transmission quality and reduce

interference

DNS (Domain Name System)

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.

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.

Enhanced Data Encryption through TKIP

To improve data encryption, Wi-Fi Protected Access utilizes its Temporal Key Integrity Protocol (TKIP).

TKIP provides important data encryption enhancements including a per-packet key mixing function, a

message integrity check (MIC) named Michael, an extended initialization vector (IV) with sequencing rules,

and a re-keying mechanism. Through these enhancements, TKIP addresses all WEP known vulnerabilities.

Enterprise-level User Authentication via 802.1x and EAP

WEP has almost no user authentication mechanism. To strengthen user authentication, Wi-Fi Protected

Access implements 802.1x and the Extensible Authentication Protocol (EAP). Together, these

implementations provide a framework for strong user authentication. This framework utilizes a central

authentication server, such as RADIUS, to authenticate each user on the network before they join it, and also

employs "mutual authentication" so that the wireless user doesn’t accidentally join a rogue network that

might steal its network credentials.

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