Which two statements are true about multicast communication within a cluster?
A.
Multicast can be used for cluster heartbeat messages.
B.
Multicast is used to replicate session state between servers.
C.
Multiple clusters can share the same multicast address and port.
D.
You may disable multicast on individual cluster members.
E.
Multicast traffic is often limited to a single subnet.
Explanation:
A: WebLogic Server instances in a cluster communicate with one another using two
basic network technologies:
* IP sockets, which are the conduits for peer-to-peer communication between clustered server
instances.
* IP unicast or multicast, which server instances use to broadcast availability of services and
heartbeats that indicate continued availability.
E: In many deployments, clustered server instances reside within a single subnet, ensuring
multicast messages are reliably transmitted. However, you may want to distribute a WebLogic
Server cluster across multiple subnets in a Wide Area Network (WAN) to increase redundancy, or
to distribute clustered server instances over a larger geographical area.
Reference: Using WebLogic Server Clusters, Communications In a Clusterhttp://docs.oracle.com/cd/E11035_01/wls100/cluster/features.html
A E
A,E