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 On a WLAN that uses IEEE 802.1X for wireless network authentication, enabling local EAP allows clients to authenticate using locally stored credentials on the Cisco Wireless LAN Controller (WLC), which is useful in scenarios where the external RADIUS server is unavailable. The LDAP server option is used to authenticate clients against a central repository, such as an LDAP directory. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide