Which three statements about RADIUS are true? (Choose three.)

A.
RADIUS uses TCP port 49.

B.
RADIUS uses UDP ports 1645 or 1812.

C.
RADIUS encrypts the entire packet.

D.
RADIUS encrypts only the password in the Access-Request packet.

E.
RADIUS is a Cisco proprietary technology.

F.
RADIUS is an open standard.

Explanation:
TACACS+ and RADIUS Protocol Comparison
Point of Comparison
TACACS+
RADIUS
Transmission Protocol

TCP—Connection-oriented transport-layer protocol, reliable full-duplex data transmission.
UDP—Connectionless transport-layer protocol, datagram exchange without acknowledgments or
guaranteed delivery. UDP uses the IP to get a data unit (called a datagram) from one computer to
another.
Ports Used
49
Authentication and Authorization: 1645 and 1812Accounting: 1646 and 1813.
Encryption
Full packet-body encryption.
Encrypts only passwords up to 16 bytes.
AAA Architecture
Separate control of each service: authentication, authorization, and accounting.
Authentication and authorization combined as one service.
Intended Purpose
Device management.
User access control.
Open Standards
Developed by Cisco
Open standard
Reference:
http://www.cisco.com/c/en/us/td/docs/net_mgmt/cisco_secure_access_control_system/5-
2/user/guide/acsuserguide/rad_tac_phase.html