Hardware Support
WPA was specifically designed to work with wireless hardware that was produced prior to the introduction of the WPA protocol which had only supported inadequate security through WEP. Some of these devices support the security protocol only after a firmware upgrade. Firmware upgrades are not available for some legacy devices.
Wi-Fi devices certified since 2006 support both the WPA and WPA2 security protocols. WPA2 may not work with some older network cards.
Read more about this topic: Wi-Fi Protected Access
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