Which three authentication services are supported by Cisco NAC Appliance? (Choose three.)
A . RADIUS
B . LDAP
C . Kerberos
D . TACACS+
E . local
F . SNMP
Answer: ABC
Explanation:
Working with Existing Backend Authentication Servers When working with existing backend authentication servers, Cisco supports the following authentication protocol types:
– Kerberos
– RADIUS (Remote Authentication Dial-In User Service)
– Windows NT (NTLM Auth Server)
– LDAP (Lightweight Directory Access Protocol)
https://www.cisco.com/c/en/us/td/docs/security/nac/appliance/configuration_guide/47/cam/
47cam-book/m_auth.html