然而，多数包过滤是不分国家的，它们只懂得低级协议，难以配置和验证。

However, most packet-filters are stateless, understand only low-level protocols, and are difficult to configure and verify.

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选择网络传输方法，并在低级协议(如套接字、RMI、URL和文件等等)之中选择。

Select network transport method, choosing among low-level protocols such as sockets, RMI, URLs, files, and so on.

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这使得公司能够描述它们的服务，也使得客户能够按标准方法消费服务，而不必对有关较低级别的交换协议(绑定)，如SOAP，了解很多。

This enables companies to describe their services and enables the client to consume the services in a standard way without knowing much on the lower level exchange protocol (binding) like SOAP.

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