Introduction - If you have any usage issues, please Google them yourself
We have to discuss how communication between the network processes? The most pressing issue is how to uniquely identify a process, otherwise the communication is out of the question! Locally through the process PID to uniquely identify a process, but it does not work in the network. In fact, the TCP/IP protocol suite has been helping us solve this problem, " ip address" of the network layer can be uniquely identifies network host transport layer protocol the+ port " can uniquely identify the host application (process). This triples (ip address, protocol, port) can identify the network process, the process of communication in the network can use this flag to interact with other processes.