Which statement about configuration of Layer 2 wireless user authentication on a Cisco WLC is true?
A . Local EAP is used only if an external RADIUS is not configured or is unreachable.
B . The external RADIUS is used only if local EAP is not configured.
C . The administrator chooses whether local EAP or an external RADIUS is used first.
D . The external RADIUS is used only if local EAP is explicitly disabled.
Answer: A
Explanation:
If any RADIUS servers are configured on the controller, the controller tries to authenticate the wireless clients using the RADIUS servers first. Local EAP is attempted only if no RADIUS servers are found, either because the RADIUS servers timed out or no RADIUS servers were configured. If four RADIUS servers are configured, the controller attempts to authenticate the client with the first RADIUS server, then the second RADIUS server, and then local EAP. If the client attempts to then reauthenticate manually, the controller tries the third RADIUS server, then the fourth RADIUS server, and then local EAP.
http://www.cisco.com/c/en/us/td/docs/wireless/controller/7-4/configuration/guides/consolidated/ b_cg74_CONSOLIDATED/b_cg74_CONSOLIDATED_chapter_0110010.html