WiFoo..The.Secrets.of.Wireless.Hacking [Electronic resources] نسخه متنی

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NEMA enclosure

An enclosure that conforms to one of the National Electrical Manufacturers Association's many different types. Typically used in WLAN systems for dust, water, and temperature protection of an AP.

OFDM

orthogonal frequency-division multiplexing. A modulation technique used to provide very high data rates for 802.11a and 802.11g.

omnidirectional antenna

An antenna that radiates RF energy in a 360-degree pattern about an axis. An omni antenna can pick up signals from all directions; that is, it does not have to be pointed directly at the source of the signal to pick it up. Typically, this type of antenna is used when the specific direction of the signal is not known, as in a mobile application or when point-to-multipoint operation is desired.

open authentication

An authentication algorithm defined in the IEEE 802.11 specification where a client is permitted to "authenticate" to the network, regardless of whether it possesses the correct WEP key. Open authentication is typically used in conjunction with 802.1x authentication to establish initial client 802.11 connectivity prior to submission of EAP authentication.

oscillator

A device that produces a "vibration" or variation in signal level at a given frequency.