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As a network infrastructure expands in size, the number of concurrent outages can be expected to grow in frequency. The purpose of this paper is to investigate through simulation the characteristics of concurrent network outages and how they impact network operators' perspective of network dependability. The dependability investigated includes network reliability, availability, maintainability and survivability. To assess this phenomenon, a new event definition, called an "Impact epoch", is introduced. Epochs are defined to be either single, concurrent, or overlapping outages in time, which can be best assessed with new metrics and simulation.
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