The transparent firewall feature is designed for security professionals who do not want to change existing address schemes, but still require a firewall to inspect all packets leaving a subnet. Cisco ASA integrates features like security contexts with the transparent firewall and, therefore, presents a complete solution to fit any design scenario. This chapter covered the architectural overview of the transparent firewall and provided detailed configuration guides to suit any network deployments. This chapter also provided two deployment scenarios to enforce learning and to show the robustness of this feature. Extensive show and debug commands were discussed to assist a network administrator in troubleshooting complicated transparent firewall deployments.