How failover happens in cisco asa Firewall

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Cisco ASA Firewall uses failover to ensure high availability and uninterrupted network services.

Failover is the process of switching to a backup device in case of a failure in the primary device.
Cisco ASA Firewall supports two types of failover: Active/Standby and Active/Active.
In Active/Standby failover, one firewall is active and the other is in standby mode, ready to take over in case of a failure.
In Active/Active failover, both firewalls are active and share the traffic load, providing redundancy and load balancing.
Failover can be triggered by various events such as hardware failure, software failure, or network connectivity loss.
During failover, the active firewall sends a gratuitous ARP to update the ARP cache of the network devices.
Failover can be configured using the Cisco Adaptive Security Device Manager (ASDM) or the Command Line Interface (CLI).

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