a classification of low priority network traffic,used especially with regard to the Internet. Different kinds of traffic have different priorities.Videoconferencing and other types of real-time communication,for example,require a certain minimum guaranteed bandwidth and latency and so must be given a high priority.Electronic mail,on the other hand,can tolerate an arbitrarily long delay and is classified as a best-effort service.

or redes de servicio mínimo posible

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Note added at 13 mins (2003-12-26 23:25:01 GMT)
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best effort service = servicio mínimo posible = a service model which provides minimal performance guarantees, allowing an unspecified variance in the measured performance criteria (Networks:Wireless Networking:Third Generation Wireless Networks)

redes de calidad de servicio mínima posible = the quality of service delivered by the bearer network if the guaranteed quality of service cannot be delivered. The lowest of all quality of service traffic classes.