Information systems, security and networks are the main asset of organizations today. This is reflected in the resources they are investing in order to prevent further attacks and vulnerabilities. This project shows how the IEAISA company has to restructure its local area network (LAN) in order to improve the security and to increase the efficiency in their daily operation. In order to carry out the remodeling a Network Access Control (NAC) solution has been proposed allowing to control the access of all devices among the company. This technology enables the possibility to analyze and separate organization devices throughout the use of internal policies and procedures that restric the access according to specific control policies. Furthermore, it is capable to restrict the access to the resources of the company for those users who do not have a permission, regardless from where they try to access (i.e., inside the company or remotely). Additionally, this solution requires that many devices must be reconfigured, by adapting them to the new operation and behavior of the network. An investigation has been carried out on the operation of the NAC solution and associated technologies, followed by a choice of the NAC that best fits the characteristics of the company. The entire process has been documented, including the whole change process followed by IEAISA network and summing up with the configuration of all the devices and the NAC solution chosen in order to achieve the established objectives.
