[ATP/FLEX]What does the "guest network" mean in interface?

Zyxel_Cooldia

Question:
What does the "guest network" mean in interface?

Answer:
Once the guest network is enabled, clients from this interface can only access the Internet and are unable to reach other internal interface subnets hosts.

For example, the VLAN99 is in default security policy by default.

After enabling the "Guest Network" on VLAN99, the firewall removes VLAN99 from the original security policy and adds three implicit allow rules for VLAN99. There is no security for destination any.

From vlan99 to Internet service any, action=allow
From vlan99 to Device HTTP,HTTPS, and DNS(UDP), action=allow
From vlan99 to Device DNS(TCP), action=allow