Which RADIUS server authentication protocols are supported on Cisco ASA firewalls?
(Choose three.)

A.
EAP

B.
ASCII

C.
PAP

D.
PEAP

E.
MS-CHAPv1

F.
MS-CHAPv2

Explanation:
The ASA supports the following authentication methods with RADIUS servers:
PAP – For all connection types.
CHAP and MS-CHAPv1 – For L2TP-over-IPsec connections.
MS-CHAPv2 – For L2TP-over-IPsec connections, and for regular IPsec remote access
connections when the password management feature is enabled. You can also use MSCHAPv2 with clientless connections.
Authentication Proxy modes – For RADIUS-to Active-Directory, RADIUS-to-RSA/SDI,
RADIUS- to-Token server
http://www.cisco.com/c/en/us/td/docs/security/asa/asa91/configuration/general/asa_91_gener
al_config/aaa_radius.html#77318