310 Chapter 12 The three-dimensional attack taxonomy was motivated by the cellular network specific abstract model, which is an atomic model of cellular network service nodes. It enabled better study of interactions within the cellular network and aided in derivation of several insightful characteristics of attacks on the cellular network. The abstract model not only led to the development of the three-dimensional attack taxonomy that has been instrumental in uncovering (1) cascading attacks, a type of attack in which the adversary targets a specific network location but attacks another location, which in turn propagates the attack to the target location, and (2) cross-infrastructure cyber attack, a new breed of attack in which the cellular network may be attacked from the Internet [30]. In this part of the chapter we further detail the three-dimensional attack taxonomy and cellular network abstract model. Abstract Model The abstract model dissects functionality of the cellular network to the basic atomic level, allowing it to systematically isolate and identify vulnerabilities. Such identification of vulnerabilities allows attack classification based on vulnerabilities, and isolation of network functionality aids in extraction of interactions between network components, thereby