This report provides a comprehensive network security plan for Corporation Techs, addressing key aspects of network design, vulnerabilities, and mitigation strategies. The report begins with an executive summary and an overview of the current network design, highlighting critical points of failure such as switches, connections to administrative offices, and VPN connections. It proposes a GPON network design for improved capacity and future expansion, detailing its features and benefits. The report also outlines hardening strategies, including disabling unnecessary services and patching servers. Furthermore, it identifies various network vulnerabilities, such as malware, unpatched software, weak passwords, and insufficient security training, along with corresponding mitigation strategies like blocking unsafe sites, using vulnerability assessment tools, and implementing multi-factor authentication. Additional mitigation strategies include employing anti-malware software, intrusion detection systems, and strong password policies. The report also discusses mechanisms to secure remote network users, such as firewalls, antivirus software, VPNs, and multi-factor authentication. Finally, the report emphasizes the importance of server registration, security patches, and the use of non-privileged accounts. It concludes by highlighting expectations for redundancy, VLAN isolation, and firewall implementation, along with the benefits of the proposed network security plan. The report includes a works cited section with references to relevant literature.