“…It presents an integrated development program that has become extremely popular over several years among engineers, researchers and specialists in almost all fields of modern science and technology. The software product of the American company Cisco Systems offers great opportunities for complex calculations, simulation and visualization of small and large local, urban and global networks, as well as high-quality graphical presentation of the results [1, 3,4,6,8,10,12,15,18,19,27,30,31,32]. The program allows network architects to construct their own virtual network model to access important graphical images of network devices in order to combine the provision of communication networks, adding special data packets and creating many more useful network features.…”