IP网络最初设计用来进行数据通信，但现在却越来越多地被用于实时应用，这就要求IP网络能为用户提供更好的服务质量，而不只是“尽最大努力交付”的服务。
As IP network originally developed for data communications is now used more and more for real-time applications, there is a need for better quality of service than the "best effort".
ESB 可以利用不同的通信协议，以支持请求者和提供者之间的不同服务质量；例如，支持“尽最大努力”或“有保证”的交付。
The ESB can leverage different protocols to support differing qualities of service between requesters and providers; for example, to support best effort or assured delivery.
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