“提供的接口”描述了其环境通过端口对标识符的请求。

"Provided interfaces" characterize requests to the classifier that its environment may make through the port.

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“需要的接口”描述了标识符对其环境通过端口发出的请求。

"Required interfaces" characterize the requests that may be made from the classifier to its environment through the port.

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地址用来标识一个连接两端的两台计算机，而端口号则确保两台计算机之间的连接都有一个唯一的标识符。

The addresses specify the two machines at each end while the port Numbers ensure that the connection between the two computers has a unique identifier.

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