Zone Based Firewall is the most advanced method of a stateful firewall that is available on Cisco IOS routers. The idea behind ZBF is that we don’t assign access-lists to interfaces but we will create different zones. Interfaces will be assigned to the different zones and security policies will be assigned to traffic between zones
Using ASA (Adaptive Security Appliance)
Using Reflexive ACL
Using CBAC (Context Base Access Control)
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