A Cisco Unified CallManager cluster contains a first node and four subsequent nodes. If the first node becomes unavailable, which three of these statements are true? (Choose three.)
A.
Available Cisco Unified CallManager servers work from the local backup database.
B.
The Informix database will save configuration changes on subsequent nodes to be uploaded to the first node when available.
C.
All on-net calls are dropped
D.
New Cisco Unified CallManager devices can be configured.
E.
The Informix database automatically locks.
F.
All IP telephony devices continue to operate.
Explanation:
The first node (primary) reads its own local database for information. The subsequent nodes (subscribing nodes) look to the primary database for their information. In the event of a failure to the first node, the subsequent nodes read their local copy of the database. Only the first node can make changes to its Informix database. Backup CallManager servers provide call-processing redundancy to primary servers. If a CallManager server fails, then survivable endpoints can home to a secondary CallManager server. Survivable endpoints are needed to support call survivability, meaning that the RTP bearer stream (voice conversation) between two IP endpoints is preserved even if the CallManager that originally established the stream between the endpoints is no longer reachable.