1. A computer-implemented method for using multi-dimensional geometry in simulations of packet flows through network devices, the computer-implemented method comprising: receiving, by an access control list evaluator at a network security server application, an input object for traffic simulation of network devices from a network authentication systems application of a computing device, wherein the input object comprising a source and destination host ranges and source and destination port ranges, and protocol, application and vulnerability ranges, targeted for the destination host ranges, wherein the traffic simulation is filtered by access control lists and routing tables of the network devices, wherein a section of at least two cuboids of the input object is missing during the traffic simulation of the network devices, and wherein the missing section of the at least two cuboids of the simulated traffic is blocked by the access control list; representing, by the access control list evaluator, blocked traffic of the simulated traffic by an intersection of at least two n-dimensional cuboids in n-dimensional space; subtracting, by the access control list evaluator, an access control list shape from an input shape to obtain a concave form representing permitted host, port, protocol, application, and vulnerability combinations of ranges, based on the input object and access control list rules and route tables, wherein the input shape yields a concave form that represents the permitted host, port, protocol, application, and vulnerability combinations of ranges, based on the traffic simulated input; and decomposing, by the access control list evaluator, the obtained concave shape into multiple convex shapes, each representing a single set of the host, port, protocol, application and vulnerability ranges that satisfy a set of predetermined input conditions.