The network security has become more important since people spend most of their
time to get connected through computer network. The quick development of Internet
and internal networking requires the security towards internal network from external
network attacks or even by the internal network itself. Universitas Negeri Manado
(UNIMA) is one of the universities in North Sulawesi that has been implementing and
adapting information technology and communication. The related problems about
the issue of network security, such as, hacker activity, virus attacs, denial of service
attack (DoS), spyware, malware, and the other attacks may threaten the network
security anytime when there is no good management and control because of the
limitation of experts in that infrastructure and network security. In order to
overcome and prevent the network security problem, it needs to do the network
infrastructure analysis and to design the infrastructure that is suitable with the recent
and future demands by using Access/Distribution/Core Architectural Model as the
basic research development that will be done. The result of this research is the
programming of short term and long term network security.