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In the ecosystem of network security virtualization, the Cisco Adaptive Security Virtual Appliance (ASAv) represents the bridge between traditional hardware firewalling and modern software-defined networking (SDN). While the hardware ASAs (5500-X series, Firepower 2100, etc.) are physical workhorses, the ASAv is the pure software incarnation of the PIX/ASA codebase, designed to run on hypervisors. Cisco Asav Software Download
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