Core networks today represent the backbone of any network infrastructure, which in today's global business environment combine internal and external forms of communication. Outages, unavailability of information, failures in the management of resources, are just some of the reasons that lead to a decrease in productivity, which requires careful strategic planning of network business.Changed business conditions, based on the implementation of new collaborative platforms, dictate the direction of development of more complex and demanding communication networks. Quickly routing of information to the final devices, the presence of video and VoIP technologies, efficient data management, sound, image and video content and enhancement of business applications are essential requirements which the core network must fulfill. These business trends have led to the development of Cisco service-oriented network architecture that provides the greatest degree of utilization of the network infrastructure, scalability, rapid return on investment and simplicity in system maintenance.