通常这些工具必须使用协议和/或端口号来确定正在传输的内容。
Often these tools rely on the protocol and/or port number to identify the content being transferred.
它还可以识别哪些主机是可以访问的、它们的IP和mac地址，并扫描和检查已打开的端口、所使用的协议和主机操作系统。
It also identifies which hosts are accessible, their IP and MAC addresses, and scans and checks the open ports, protocols used, and the host operating system.
binding：将抽象的端口类型与其消息和操作绑定到传输协议和消息格式。
Binding: Binds the abstract port type, along with its messages and operations, to a transport protocol and message format.
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