Computer network-socket Overview

(1) socket Concept

For inter-network process communication, the two processes must be uniquely identified. The "ip address" at the network layer can uniquely identify the network host. The "IP + port" at the transport layer can uniquely identify the two processes on the network.

After two processes are identified, socket is usually used for communication.

The socket originated from UNIX and continued the concept of "Everything is a file". It uses the "Open-read-write-close" file operation method.

Shows the relationship between the socket layer and the application layer.

(2) socket communication process

Server: socket-> bind-> listen-> Accept-> receive-> close

Client: socket-> connect-> send-> close

The server needs to obtain the IP address and the bound port number for the client to call. Therefore, bind and listern are required. The client port number is bound to the port number during connect.

(3) socket connection establishment process

Establish a connection with the three-way handshake of TCP/IP

Using the packet capture tool, you can see the three handshakes of my visit to the blog http://blog.csdn.net/wangpeifeng669.

(4) socket release process

Release connections four times

For Java Socket Connection demo, refer to here

From:

Http://blog.csdn.net/dlutbrucezhang/article/details/8577810

Http://www.cnblogs.com/dolphinX/p/3460545.html

Computer network-socket Overview