Quatech 802.11B/G Spezifikationen PDF herunterladen (Seite 35)

100-8004-102G Airborne Wireless LAN Node Module Data Book

Page 29

Quatech, Inc. Confidential

CHAPTER 4

WIRELESS SECURITY

4.1 WPA AND LEAP SECURITY

The WPA and LEAP software modules provide advanced security configuration and

communication services required by today’s enterprise-class deployments.

Please refer to IEEE standard 802.1X 2001 (section 4) and IEEE standard 802.11i 2004

(section 4) for additional information.

4.1.1 Terminology

 “4-Way Handshake” refers to a connection method where each side of the

connection acts independently (four packets are exchanged between the supplicant and

the authenticator) and is required to successfully complete the WPA authentication

process.

 "Authentication Server" refers to an entity providing authentication service to the

authenticator. It may be co-located with an authenticator (e.g., as in a Cisco 1200

Access Point), but is usually an external server (e.g., RADIUS).

 "Authenticator" refers to the entity that requires the entity on the other end of the link

to be authenticated.

 “EAP” refers to Extensible Authentication Protocol, a general protocol supporting

multiple authentication methods used between the client and the authenticator. The

802.1X standard specifies encapsulation methods for transmitting EAP messages so

they can be carried over different media.

 “EAPOL” refers to EAP over LAN, an 802.1X delivery mechanism used in

authentication. EAPOL encapsulates EAP messages between the supplicant and the

authenticator.

 “ESS”. Each set of wireless devices communicating directly with each other is called

a basic service set (BSS). Several BSSs can be joined together to form one logical

WLAN segment, referred to as an extended service set (ESS). A Service Set Identifier

(SSID) is the 1-32 byte alphanumeric name given to each ESS.

 “IEEE 802.1X” refers to the IEEE standard for port-based network control. 802.1X

provides multiple methods to authenticate devices attached to a LAN port and functions

with both wired and wireless LAN media. 802.1X is based on the Extensible

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