This report presents a comprehensive network infrastructure design and implementation plan for a Chinese mining company expanding its operations in Australia. The company requires a robust network connecting its head office in Sydney with two branch offices in Darwin and Perth. The report outlines the network design, IP addressing scheme, protocol configuration, and testing strategy. It utilizes Cisco Packet Tracer for simulation and addresses the specific requirements of the company, including VLAN segmentation for different departments and secure communication between sites. The report also includes a detailed analysis of the testing process and troubleshooting steps.