Glossary
GL-6
Cisco Aironet 340, 350, and CB20A Wireless LAN Client Adapters Installation and Configuration Guide for Windows
OL-1394-07
T
TKIP
Temporal Key Integrity Protocol. Also referred to as WEP key hashing. A security feature that defends
against an attack on WEP in which the intruder uses the initialization vector (IV) in encrypted packets
to calculate the WEP key. TKIP removes the predictability that an intruder relies on to determine the
WEP key by exploiting IVs.
transmit power
The power level of radio transmission.
U
unicast packets
Packets transmitted in point-to-point communication.
UNII
Unlicensed National Information Infrastructure. An FCC regulatory domain for 5-GHz wireless
devices. UNII bands are 100 MHz wide and divided into four channels when using 802.11a OFDM
modulation.
UNII 1
A UNII band dedicated to in-building wireless LAN applications. UNII 1 is located at 5.15 to 5.25 GHz
and allows for a maximum transmit power of 40 mW (or 16 dBm) with an antenna up to 6 dBi. UNII 1
regulations require a nonremovable, integrated antenna.
UNII 2
A UNII band dedicated to in-building wireless LAN applications. UNII 2 is located at 5.25 to 5.35 GHz
and allows for a maximum transmit power of 200 mW (or 23 dBm) with an antenna up to 6 dBi. UNII
2 regulations allow for an auxiliary, user-installable antenna.
W
WDS
Wireless domain services (WDS). An access point providing WDS on your wireless LAN maintains a
cache of credentials for CCKM-capable client devices on your wireless LAN. When a CCKM-capable
client roams from one access point to another, the WDS access point forwards the client's credentials
to the new access point with the multicast key. Only two packets pass between the client and the new
access point, greatly shortening the reassociation time.
WEP
Wired equivalent privacy. An optional security mechanism defined within the 802.11 standard designed
to protect your data as it is transmitted through your wireless network by encrypting it through the use
of encryption keys.
workstation
A computing device with an installed client adapter.
WPA
Wi-Fi Protected Access. A standards-based, interoperable security enhancement that greatly increases
the level of data protection and access control for existing and future wireless LAN systems. It is
derived from and will be compatible with the upcoming IEEE 802.11i standard. WPA leverages
Temporal Key Integrity Protocol (TKIP) for data protection and 802.1X for authenticated key
management.
