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The major objective of this paper is to develop the network security modeling and cyber attack simulation that is able to classify threats, specify attack mechanisms, verify protection mechanisms, and evaluate consequences. To do this, we have employed the advanced modeling and simulation concepts such as System Entity Structure / Model Base framework, DEVS (Discrete Event System Specification) formalism, and experimental frame concept underlying the object-oriented S/W environment. Our approach is to show the difference from others in that (i) it supports a hierarchical and modular modeling environment, (ii) it generates the command-level behavior of cyber attack scenario, (iii) it provides an efficient model building environment based on the experimental frame concept, and (iv) it supports the vulnerability analysis of given node on the network. Simulation test performed on sample network system …