多播是将同一信息从源节点传送到网络中多个目的节点。
Data packet is transmitted from source node to multiple destination nodes in multicast communication.
在该区域中的节点，将会收到目的节点的跳数报文，获得到达目的节点的路由。
Those nodes who are in the repair area will receive the packets from the destination node to know the routing path to reach the destination node.
集群的每一半都包含完全相同数目的节点，若其中的一半丢失，就会带来仲裁问题。
As each half of the cluster contains exactly the same number of nodes, should one half be lost, quorum becomes an issue.
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