Determines the security modes of the WLAN port.
none - The default value, no any security mode is set.
psk - Access to the port is denied until the port client is
authorized (by 802.1X key negotiation).
radius - Access to the port is denied until the port
client is authorized (by 802.1X).
wlanex - Access to the port is denied until the port client is
authenticated by wlan cert.