Efficient Networks 802.11g Turbo WLAN USB Adapter with RP-SMA Connector - Manual (Page 18)

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3.2.1.2 Authentication and Security
Parameter Description
Authentication Type This setting has to be consistent with the wireless networks that
the adapter intends to connect.
Open – No authentication is needed among the wireless network.
Shared – Only wireless devices using a shared key (WEP Key
identified) are allowed to connecting each other.
LEAP – LEAP is a pre-EAP, Cisco-proprietary protocol, with many
of the features of EAP protocols. Cisco controls the ability of other
vendors to implement this protocol, so it should be selected for
use only when limited vendor choice for client, access-point, and
server products is not a concern. When you have set up LEAP
authentication, you have to enter the user name and password of
your computer.
WPA – WPA provides a scheme of mutual authentication using
either IEEE 802.1x/Extensible Authentication Protocol (EAP)
authentication or pre-shared key (PSK) technology. It provides a
high level of assurance to enterprises, small businesses and
home users that data will remain protected and that only
authorized users may access their networks. For enterprises that
have already deployed IEEE 802.1x authentication, WPA offers
the advantage of leveraging existing authentication databases
and infrastructure.