Now let's see at a high level how a network packet is structured. Depending on the protocol being used for the communication, you could be dealing with one of the following IP packets.

现在我们从更高的层次看看网络包的结构是怎样的。

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Since the UDP protocol is non-connection, a transfer control should be taken on the high level to avoid high packet loss when the network is bad.

而UDP协议是无连接的，因此要在上层对用户数据报协议包的发送速率进行控制，来避免在网络情况不良的时候，产生较大的丢包率。

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