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Service Level Agreements (SLAs) define performance guarantees made by service providers, e.g, in terms of packet loss, delay, delay variation, and network availability. In this paper, the authors describe a new active measurement methodology to accurately monitor whether measured network path characteristics are in compliance with performance targets specified in SLAs. Specifically, they introduce a new methodology for estimating packet loss rate that significantly improves accuracy over existing approaches; a new methodology for measuring mean delay along a path that improves accuracy over existing methodologies, and a method for obtaining confidence intervals on quantiles of the empirical delay distribution without making any assumption about the true distribution of delay.
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