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Denial-of-service (DoS) attacks are an imminent and real threat to many enterprises. Decision makers in these enterprises need be able to assess the risk associated with such attacks and to make decisions regarding measures to put in place to increase the security posture of their systems. Experiments, simulations and analytical research have produced data related to DoS attacks. However, these results have been produced for different environments and are difficult to interpret, compare, and aggregate for the purpose of decision making. This paper aims to summarize knowledge available in the field by synthesizing the judgment of 23 domain experts using an establishing method for expert judgment analysis. Different system architecture's vulnerability to DoS attacks are assessed together with the impact of a number of countermeasures against DoS attacks.