
Glossary
SCALANCE WLC711
A-14 C79000-G8976-C260-03, 07/2012, User Guide, V8.11
WMM 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 compliant 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.
WPA Wireless Protected Access, or Wi-Fi Protected Access is a security solution adopted by the
Wi-Fi Alliance that adds authentication to WEPs’ 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.
WPA-PSK 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 AP 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.
Table A-1 Networking Terms and Abbreviations (continued)
Term Explanation
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