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Networking terms and abbreviations
Wi-Fi Multimedia (WMM), a Wi-Fi Alliance certified standard that
provides multimedia enhancements for Wi-Fi networks that improve
the user experience for audio, video, and voice applications. This
standard is complicant with the IEEE 802.11e Quality of Service (QoS)
extensions for 802.11 networks. WMM provides prioritized media
access by shortening the time between transmitting packets for higher
priority traffic. WMM is based on the Enhanced Distributed Channel
Access (EDCA) method.
Wireless Protected Access, or Wi-Fi Protected Access is a security
solution adopted by the Wi-Fi Alliance that adds authentication to
WEP's basic encryption. For authentication, WPA specifies IEEE
802.1x authentication with Extensible Authentication Protocol (EAP).
For encryption, WPA uses the Temporal Key Integrity Protocol (TKIP)
mechanism, which shares a starting key between devices, and then
changes their encryption key for every packet. Certificate
Authentication (CA) can also be used. Also part of the encryption
mechanism are 802.1X for dynamic key distribution and Message
Integrity Check (MIC) a.k.a. "Michael".
WPA requires that all computers and devices have WPA software.
Wi-Fi Protected Access with Pre-Shared Key, a special mode of WPA
for users without an enterprise authentication server. Instead, for
authentication, a Pre-Shared Key is used. The PSK is a shared secret
(passphrase) that must be entered in both the wireless access point or
router and the WPA clients.
This preshared key should be a random sequence of characters at
least 20 characters long or hexadecimal digits (numbers 0-9 and
letters A-F) at least 24 hexadecimal digits long. After the initial shared
secret, the Temporal Key Integrity Protocol (TKIP) handles the
encryption and automatic rekeying.
A31003-W1010-A100-1-7619, July 2005
HiPath Wireless Controller, Access Points and Convergence Software V3.0: User Guide