This report provides a comprehensive IT infrastructure design for iTech, a five-story building with 900 devices. It begins with an introduction and outlines the project's aims and objectives, including blocking unauthorized network access and configuring essential services like DHCP, DNS, and web servers. The report covers the organization's requirements, geographical scope, and scalability considerations. It proposes both dedicated server and cloud-based designs, detailing required components, the three-layer hierarchical model, and IP address allocation. The dedicated server design focuses on load balancing and server virtualization. The cloud design emphasizes the benefits of cloud services like Amazon Web Services (AWS). The report includes network simulation configurations for DHCP, DNS, and web servers. It concludes with recommendations and highlights the importance of a well-designed IT infrastructure for iTech's future growth and security. The report is a complete analysis and offers a detailed design proposal for the IT infrastructure of iTech.