原始系统接口接收请求，并向目标系统接口发送一个传输响应，以告知是否成功接收到相应数据。

The originating System Interface receives the request and sends a transmission response back to the target System Interface announcing whether or not it has successfully received the data.

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系统接口接收请求，并向中介发送一个传输响应，以告知是否成功接收到相应数据。

The System Interface receives the request and provides a transmission response back to the Mediator announcing whether or not it has successfully received the data.

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如果ping不成功，可以使用ifconfig检查用来发送请求的适配器是否启动了。

If the ping was unsuccessful, you can check whether the adapter used to send the request is up by using ifconfig.

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