Much of the IP data is not useful, beyond the protocol and source/destination address information.
其中除了协议和来源/目标地址信息，其余许多IP数据是没有用的。
When an application wants to send data to another host, UDP builds a header that includes a source port, a destination port which provides an address for delivering messages.
当应用软件向另一主机发送数据时，UDP协议生成一个数据头，包括源端口，目的地端口。这些端口提供为送达信息所需要的地址。
Make an IP address from the source address and routing of data sent to the destination address may become.
一个IP地址使得将来自源地址的数据通过路由而传送到目的地址变为可能。
It's an efficient way to deliver IP data package from one source to more destination, send the copy of information to a group of address, to all the recipients at the same time.
IP组播是面向组接收者的有效数据通信方式，利用一种协议将IP数据包从一个源传送到多个目的地，将信息的拷贝发送到一组地址，到达所有想要接收它的接收者处。
It's an efficient way to deliver IP data package from one source to more destination, send the copy of information to a group of address, to all the recipients at the same time.
IP组播是面向组接收者的有效数据通信方式，利用一种协议将IP数据包从一个源传送到多个目的地，将信息的拷贝发送到一组地址，到达所有想要接收它的接收者处。
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