Paloalto Networks PCNSC - Palo Alto Networks Certified Network Security Consultant

To capture a PCAP on your Panorama to troubleshoot DNS resolution issues, the appropriate CLI command is:

B.tcpdump snaplen 0 filter "port 53"

This command captures packets with no size limit (snaplen 0) and filters the traffic for port 53, which is used by DNS. This is the most straightforward and comprehensive way to capture all DNS traffic for analysis.

References:

Palo Alto Networks - Using tcpdump on PAN-OS: https://knowledgebase.paloaltonetworks.com

Palo Alto Networks - Troubleshooting Network Connectivity Issues: https://docs.paloaltonetworks.com

When a packet from an existing session is received by a firewall that is part of an HA (High Availability) pair:

D.The firewall takes ownership of the session from the peer firewall

In a high-availability configuration, if a firewall in an HA pair receives a packet for an existing session that it is not currently handling, it will take ownership of that session from the peer firewall. This ensures seamless continuity of the session and maintains the stateful nature of the firewall's session handling.

References:

Palo Alto Networks - High Availability Concepts: https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-admin/high-availability/ha-concepts

To utilize Host Information Profile (HIP) data collected at the GlobalProtect gateway for policy enforcement throughout the enterprise, the customer needs to purchase aGlobalProtect license for each firewall that will use HIP data to enforce policy. The GlobalProtect license enables the firewall to collect and use HIP data to create policies based on the security posture of the endpoints.

References:

Palo Alto Networks - GlobalProtect Licensing: https://docs.paloaltonetworks.com/globalprotect/10-0/globalprotect-admin/globalprotect-licenses

Disabling App-IDs as part of a content update can be valid in the following circumstances:

B.When you want to immediately benefit from the latest threat prevention: Disabling certain App-IDs can help ensure that the latest threat prevention measures are applied without waiting for the App-IDs to be fully tested in a specific environment. This can be crucial in quickly addressing emerging threats.

D.When an organization operates a mission-critical network and has zero tolerance for downtime: In such environments, administrators might temporarily disable new or modified App-IDs to avoid potential disruptions caused by unverified or untested App-IDs. This ensures that the network remains stable and functional while the new App-IDs are evaluated in a controlled manner.

References:

Palo Alto Networks - Best Practices for Application and Threat Content Updates: https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-admin/app-id/manage-app-id/application-and-threat-content-updates

Palo Alto Networks - Application and Threat Content Release Notes: https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-release-notes/application-and-threat-content-release-notes

To verify whether all SFP, SFP+, or QSFP modules are installed in a firewall, you should use the following CLI command:

C.show system state filter sys.s-phy*

This command provides detailed information about the physical state of the system, including the status of SFP, SFP+, and QSFP modules installed in the firewall.

References:

Palo Alto Networks - CLI Commands for Troubleshooting Hardware Issues: https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-cli-quick-start/troubleshooting-hardware-issues

Palo Alto Networks - Understanding Hardware and Interface Details via CLI: https://knowledgebase.paloaltonetworks.com