Which firewall network setting allows DHCP lease states to be periodically written to Flash?

The setting that allows DHCP lease states to be periodically written to Flash is known as Enable DHCP Server Persistence. This feature is important for maintaining the configuration and lease information of the Dynamic Host Configuration Protocol (DHCP) server after a reboot or power failure. By enabling persistence, the DHCP server can save its lease states to non-volatile memory, ensuring that the DHCP assignments can be recovered and maintained, even if the system restarts.

This is particularly vital in environments where reliability and continuity of service are crucial. If a firewall is managing a network with numerous devices relying on DHCP for IP address assignment, having the lease state data stored in Flash helps to prevent issues such as IP address conflicts or loss of connection for devices if the device unexpectedly reboots.

Other options provided do not specifically pertain to the functionality of writing DHCP lease states to Flash. For example, although DHCP Server Logging can assist in keeping track of events and operational logs, it does not directly address the persistence of lease states. Automatic IP Address Assignment relates to the basic function of DHCP but does not involve the persistence aspect. DHCP Lease Time Modification pertains to adjusting the duration that a device can hold an assigned IP address rather than saving lease states across reboots or outages.