This document details a comprehensive network design project for South West Solar, a company requiring a secure and efficient network infrastructure. The design incorporates private addressing, VLANs for segmentation, DHCP for dynamic IP assignment, and OSPF for routing. The network spans multiple locations, including the headquarters in Exeter, and remote sites in Liverpool, Campbelltown, and Parramatta, connected via Frame Relay. The solution provides logical diagrams, addressing tables for both LAN and WAN, and detailed configurations for routers and switches, including DHCP pools, OSPF configurations, and Frame Relay settings. The design prioritizes security by using private IP addresses and limiting internet access. The project also addresses specific requirements such as server placement and network segmentation to control broadcasts and enhance security. The document includes configurations for HQ, Liverpool, Campbelltown, and Parramatta routers and switches, providing a complete and practical network solution.