Sets the name of a multicast scope.

设置一个多播作用域的名称。

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In multicast communication, how to distribute and manage keys for secure communication is the research scope of multicast key management.

在组播通信中，如何实现有效的分配、管理安全通信的密钥是组播密钥管理的研究范畴。

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Set the default time-to-live for multicast packets sent out on this MulticastSocket in order to control the scope of the multicasts.

设置在此多播套接字发出的多播包的默认存活时间以便控制多播的作用域。

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