Zyxel N4100 - Manual (Page 10)

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symbols). Use the advanced wireless setup screen if you want to use
WPA or WPA2 with a RADIUS server (see the User's Guide for
details).
WEP provides data encryption only (no user authentication).
3. You can configure a backup e-mail server in the event that a
subscriber's e-mail server is unreachable from the N4100.