Explanation
https://docs.paloaltonetworks.com/wildfire/10-2/wildfire-admin/monitor-wildfire-activity/use-the-firewall-to-mo

Explanation
The best way to minimize the BGP configuration and management overhead on on-prem network devices is to summarize BGP routes before advertising them. Route summarization is a technique that reduces the number of routes in a routing table by aggregating multiple routes into a single route with a less specific prefix. This reduces the size of routing updates and the memory and CPU usage of routers. Prisma Access supports route summarization for service connections and remote network connections that use BGP routing1. You should not implement target service connection for traffic steering, as this is a feature that allows you to select a specific service connection for traffic from a remote network connection or a mobile user based on destination IP address or application. This does not affect the BGP configuration or management on on-prem network devices2. You should not implement hot potato routing, as this is a routing technique that selects the closest exit point to the destination network based on the number of hops or the lowest IGP metric. This does not affect the BGP configuration or management on on-prem network devices3. You should not implement default routing, as this is a routing technique that uses a default route to forward packets to an unknown destination. This does not affect the BGP configuration or management on on-prem network devices, and it may not provide optimal routing for Prisma Access traffic4. References: 1:
https://docs.paloaltonetworks.com/prisma/prisma-access/prisma-access-panorama-admin/prepare-the-prisma-acc
2:
https://docs.paloaltonetworks.com/prisma/prisma-access/prisma-access-panorama-admin/prepare-the-prisma-acc
3:
https://docs.paloaltonetworks.com/prisma/prisma-access/prisma-access-cloud-managed-admin/prisma-access-ser
4:
https://docs.paloaltonetworks.com/prisma/prisma-access/prisma-access-cloud-managed-admin/prisma-access-ser

Explanation
According to the Palo Alto Networks documentation , the User-ID XML API is a feature that allows external systems to send user mapping information to the firewall or Panorama using XML messages over HTTPS. The User-ID XML API can be used to integrate with third-party identity management solutions (IDM) that can provide authentication events for VPN and wireless users. Therefore, the correct answer is C.
The other options are not effective or relevant for extracting and learning IP-to-user mapping information from authentication events for VPN and wireless users:
Add domain controllers that might be missing to perform security-event monitoring for VPN and wireless users: This option would not help because the root cause analysis showed that authentication events were not captured on the domain controllers that were being monitored. Adding more domain controllers would not change this fact, unless they were configured to receive authentication events from RADIUS servers, which is not mentioned in the scenario.
Configure the integrated User-ID agent on PAN-OS to accept Syslog messages over TLS: This option would not help because it assumes that the IDM solution can send Syslog messages over TLS, which is not mentioned in the scenario. Moreover, Syslog messages are less reliable and secure than XML messages for user mapping information.
Configure the Windows User-ID agents to monitor the VPN concentrators and wireless controllers for IP-to-User mapping: This option would not help because it assumes that the VPN concentrators and wireless controllers can provide IP-to-User mapping information, which is not mentioned in the scenario. Moreover, this option would require additional configuration and maintenance of Windows User-ID agents, which may not be feasible or scalable.
References: 1:
https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/user-id/map-ip-addresses-to-users/send-user-mappin

Explanation
As long as the action is set to allow, then it will still allow it. Threats that have the ability to become critical but have mitigating factors; for example, they may be difficult to exploit, do not result in elevated privileges, or do not have a large victim pool. WildFire Submissions log entries with a malicious verdict and an action set to allow are logged as High.
https://docs.paloaltonetworks.com/pan-os/10-1/pan-os-admin/monitoring/view-and-manage-logs/log-types-and-s

Explanation
B: Protocol Protection: Protocol protection is used to limit or block traffic that uses certain protocols or application functions. For example, a Zone Protection profile can be configured to block traffic that uses non-standard protocols, such as IP-in-IP, or to limit the number of concurrent sessions for certain protocols, such as SIP.
C: DoS Protection: DoS protection is used to protect against various types of denial-of-service (DoS) attacks, such as SYN floods, UDP floods, ICMP floods, and others. A Zone Protection profile can be configured to limit the rate of traffic for certain protocols or to drop traffic that matches specific patterns, such as malformed packets or packets with invalid headers.
D: Reconnaissance Protection: Reconnaissance protection is used to prevent attackers from gathering information about the network, such as by using port scans or other techniques. A Zone Protection profile can be configured to limit the rate of traffic for certain types of reconnaissance, such as port scans or OS fingerprinting, or to drop traffic that matches specific patterns, such as packets with invalid flags or payloads.