Sitecom WLR-4001 - Configuring WPA Pre-shared Key Security; WPA Security Standard; WPA-Radius Authentication

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Click <Apply> at the bottom of the screen to save the above configurations.
You can now configure other sections by choosing Continue, or choose Apply
to apply the settings and reboot the device.
WPA Pre-shared Key
Wi-Fi Protected Access (WPA) is an advanced security standard. You can use a
pre-shared key to authenticate wireless stations and encrypt data during
communication. It uses TKIP or CCMP (AES) to change the encryption key
frequently. So the encryption key is not easy to be cracked by hackers. This is
the best security available.
WPA-Radius
Wi-Fi Protected Access (WPA) is an advanced security standard. You can use
an external RADIUS server to authenticate wireless stations and provide the
session key to encrypt data during communication. It uses TKIP or CCMP
(AES) to change the encryption key frequently. Press Apply button when you
are done.