Most of NMBD's functions require it to bind to TCP port 137, but master browser duties involve User Datagram Protocol port 138.

虽然大多数nmbd的功能都需要将其绑定到TCP端口137，但是主浏览器职责涉及用户数据报协议(user Datagram Protocol)端口138。

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Often these tools rely on the protocol and/or port number to identify the content being transferred.

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。

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For example, some will hide content by misusing a standard port with a different protocol, like using HTTP over port 25.

例如，有些应用会通过将一个标准端口用于不同的协议而隐藏内容，如在端口25上使用HTTP协议。

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Security solutions based on physical infrastructure, and policy expressed in terms of a particular device, the corporate PC, an IP address, network port, or application protocol are becoming useless in a mobile, borderless world.

FORBES: Going Mobile: Security in the Age of Ubiquity