Explanation
Firewalls with an active WildFire WildFire signatures every five minutes. If you do not have a WildFire subscription, are made available within 24-48 hours as part of the antivirus update for firewalls with an active Threat Prevention license.
https://docs.paloaltonetworks.com/wildfire/9-0/wildfire-admin/wildfire-overview/wildfire-concepts/wildfire-sign

By default, the firewall implicitly allows intrazone traffic (within a zone) and implicitly denies interzone traffic (between zones).
By default, traffic allowed or denied by the implicit Security policy rules is not logged on the firewall.

説明/参照:
参照：
https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-admin/user-id/map-ip-addresses-to- users/configureuser-mapping-using-the-windows-user- id-agent/configure-the-windows-based-user-id-agent-for-usermapping.html

To reference the same address object in Security policies on 100 Panorama-managed firewalls, across 10 device groups and five templates, the administrator should ensure that the Shared option is checked when creating the address object. This option allows the administrator to create a shared address object that is available to all device groups and templates on Panorama. The shared address object can then be used in multiple firewall policy rules, filters, and other functions1. This reduces the complexity and duplication of managing address objects across multiple firewalls2. References: Address Objects, Create a Shared Address Object, Certifications - Palo Alto Networks, Palo Alto Networks Certified Network Security Administrator (PAN-OS 10.0) or [Palo Alto Networks Certified Network Security Administrator (PAN-OS 10.0)].