|Project Description: ||Network Security tools must be developed and improved rapidly to defend against increasingly sophisticated and determined attackers. This project examines the rationale and methodology behind “Defense in Depth” network security systems, the design and functioning of these systems, and provides examples of network security tools that can be configured and used. It also contains information on network security tools, their classifications (e.g. traffic analysis, vulnerability assessment, etc.) from a review of the literature. The project details freely available network security tools and how they can be used to improve network security. For a number of tools discussed, the project features tutorial videos on their installation and use. The project concludes by emphasizing the need for network security professionals to keep themselves abreast of new developments, in this constantly changing field, regarding both threats and defenses to those threats. It also suggests areas for future work.