(4) 连接状态协议 ( Connected State Protocol )：提供在打开了一个连接时接入终端和接入网络的过程。主要管理接入终端和接入网络之间的无线链路以及关闭连接的过程。
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控制现在返回到connect函数，该函数处于睡眠状态，直到协议层唤醒—指示连接现在是ESTABLISHED，或套接字上存在错误。
The control now returns to the connect function, which sleeps until the protocol layer wakes up-indicating that the connection is now ESTABLISHED or that there has been an error on the socket.
只有版本 4 可以使用有状态的连接，且只有版本 4 将 TCP 用作其传输协议。
Only Version 4 can use stateful connections, and only Version 4 uses TCP as its transport protocol.
使用 netstat，可以查看当前活动的连接（按单个协议进行查看），查看特定状态的连接（比如处于监听状态的服务器套接字）和许多其他的信息。
With netstat, you can view currently active connections (on a per-protocol basis), view connections in a particular state (such as server sockets in the listening state), and many others.
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