Which two statements are true about multicast communication within a cluster?
A.
Multicastcan be usedforclusterheartbeatmessages.
B.
Multicastis used to replicate session state between servers.
C.
Multiple cluster can share the same multicast address and port.
D.
You may disable multicast on individual cluster members.
E.
Multicasttraffic is often limited to a single subnet.
Correct answer: A, E
Answers : A/ E/
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A is right :
Explanation : For backward compatibility with previous versions, WebLogic Server also allows you to use multicast for communications between clusters.
Each heartbeat message contains data that uniquely identifies the server that sends the message. Servers broadcast their heartbeat messages at regular intervals of 10 seconds. In turn, each server in a cluster monitors the multicast or unicast address to ensure that all peer servers’ heartbeat messages are being sent.
Source : http://docs.oracle.com/cd/E11035_01/wls100/cluster/failover.html
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E is right : In many deployments, clustered server instances reside within a single subnet, ensuring multicast messages are reliably transmitted.
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B is wrong, IP multicast is a simple broadcast technology that enables multiple applications to “subscribe” to a given IP address and port number and listen for messages. Source > http://docs.oracle.com/cd/E11035_01/wls100/cluster/features.html
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D is wrong, is not necessary to disable it
A , E.
Answer: A,E
The corect answer is A and E. Believe me because most of this exam paper’s answers given by website are wrong.