You cannot use a multicast address for a subnet or for both the source address and the destination address.
您不能将多播地址用作子网地址，或者同时用作源地址和目标地址。
Multicast algorithm is to build a multicast tree from the source node to destination nodes, and to assign wavelength.
组播算法就是要建立一棵从源节点到目的节点的组播树，并给这棵组播树分配波长。
The issue of multicast security consists of data confidentiality, group management, data source authentication and so on.
组播安全问题包括：数据保密、组管理和访问控制、源认证等多个方面。
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