This report presents a network security case study for Denim Company, a computer selling firm with multiple branches. The report begins with an introduction to network security and its importance, followed by the company's requirements, including high-level security, secure communication, and remote access. The solution design section proposes a star topology for the network and details various security aspects, such as intrusion detection and prevention systems, trust-based computing processes, and the effective use of security techniques like authentication, digital signatures, and access control. The report also outlines the services and applications the proposed system will offer, including secure email, file sharing, remote access, and video conferencing. Interface technologies are discussed, emphasizing the importance of monitoring and troubleshooting. The analysis and evaluation section highlights how the proposed solution meets the organization's security requirements and facilitates easy monitoring. Finally, the report concludes with a summary of the key findings and recommendations.