本次实验要做的数据报套接字是无连接的，由于它不需要建立连接、内部工作也不需流量控制与差错控制，因此速度快、效率高，并且不限于一对一通信、能向若干目标结点发送数据，也能接收来自多个源结点的数据。-To do this experiment is a connectionless datagram socket, because it does not need to establish a connection, the internal work without flow control and error control, so fast, efficient, and are not limited to-one communication, can be to a number of destination node to send data, but also able to receive from multiple sources of data nodes.