Which two statements about Cisco Unified Communications Manager mixed-mode clusters are true? (Choose two.)
A. Cluster security mode configures the security capability for your standalone server or a cluster.
B. The device security mode in the phone configuration file is set to nonsecure.
C. The phone makes nonsecure connections with Cisco Unified Communications Manager even if the device security mode specifies authenticated or encrypted.
D. Security-related settings other than device security mode, such as the SRST Allowed check box, get ignored.
E. Auto-registration does not work when you configure mixed mode.
E for 11.0
A and C
B is with non-secure mode
D is with non-secure mode
E is supported in both modes
Autoregistration
The system supports autoregistration in both mixed mode and nonsecure mode. The default configuration file will also be signed. Cisco IP Phones that do not support Security by Default will be served a nonsigned default configuration file.
When the cluster security mode equals nonsecure, the device security mode equals nonsecure in the phone configuration file. In these circumstances, the phone makes nonsecure connections with the SRST-enabled gateway and Unified Communications Manager, even if the device security mode specifies authenticated or encrypted. Security-related settings other than device security mode, such as the SRST Allowed check box, also get ignored. The security configuration does not get deleted in Unified Communications Manager Administration, but security does not get provided.
The phone attempts a secure connection to the SRST-enabled gateway only when the cluster security mode equals mixed, the device security mode in the phone configuration file is set to authenticated or encrypted, the SRST Allowed? check box is checked in the Trunk Configuration window, and a valid SRST certificate exists in the phone configuration file.
Unified Communications Manager security mode that you configure to allow devices with secure/nonsecure profiles and RTP/ SRTP media to connect to Unified Communications Manager.