This document provides administrators and engineers guidance on securing Cisco firewall appliances, which increases the overall security of an end-to end architecture. The functions of network devices are structured around three planes: management, control, and data. This document is structured around security operations (best practices) and the three functional planes of a network. In addition, this document provides an overview of each included feature and references to related documentation. For the purposes of this document, all mentions of "Cisco firewall" refer explicitly to the Cisco ASA Adaptive Security Appliances, though the concepts may apply to other firewall and security devices.

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