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Palo Alto Networks Network Security Analyst Sample Questions:

1. A Palo Alto Networks firewall, running PAN-OS 10.1 , is experiencing intermittent CPU spikes to 95%+, leading to dropped new sessions and slow policy commit times. You suspect a potential resource exhaustion issue related to a specific application or threat signature. Which of the following commands or features would be MOST effective for initial diagnosis to identify the root cause of the high CPU usage without causing further service disruption?

A) Running debug device-server top-sessions count 100 to identify top bandwidth consumers.
B) Navigating to Monitor > Logs > System and filtering for high severity events related to resource usage.
C) Using the CLI command show running resource-monitor hour to observe historical CPU and session trends.
D) Executing debug software restart process all to clear any hung processes.
E) Accessing Device > Support > Technical Support File and generating a 'Full' TS file for offline analysis.

2. A security analyst is developing an automated threat hunting script using the Strata Logging Service API. The script aims to identify suspicious file downloads (executables, scripts) from unapproved or unknown websites. The desired output is a list of sessions including the user, source IP, destination URL, and the WildFire verdict. Assuming a Python script is used, which API endpoint(s) and minimum set of query parameters are necessary to achieve this efficiently, and what should be the primary filter criteria in the query?

A) API Endpoint: /log/threat and /log/url. Parameters: Separate queries for each, then manual correlation for 'file_type' and 'wildfire_verdict' from threat logs, and 'url_category' from URL logs.
B)

C)

D)

E)

3. A cybersecurity team suspects a sophisticated, custom malware campaign targeting specific internal hosts. Traditional signature-based AV and WildFire submissions show no hits, yet anomalous network behavior persists, and host forensics confirm compromise. The Palo Alto Networks firewall's Threat Prevention policies are enabled. Which specific, less common misconfiguration or oversight on the firewall's advanced threat prevention features could be allowing this stealthy malware to bypass detection, and what troubleshooting step would best confirm it?

A) The 'WildFire Analysis' security profile is configured for 'forward all' rather than 'block' for unknown files, allowing zero-day malware to reach endpoints before a verdict. Troubleshooting: Check WildFire profile's 'File Blocking' action for 'unknown files'.
B) The 'Antivirus' security profile is not configured to inspect all file types, allowing executable binaries to pass uninspected via non-standard ports. Troubleshooting: Verify the Antivirus profile's 'File Types' tab for 'any' or specific executable types.
C) The 'DNS Sinkhole' feature is misconfigured or disabled, allowing internal hosts to resolve and connect to known malicious C2 domains instead of being redirected. Troubleshooting: Check the 'DNS Sinkhole' configuration under 'Objects > DNS Sinkhole' and verify it's applied in a 'Zone Protection' profile or 'Security Policy'.
D) The 'Vulnerability Protection' security profile has certain critical signatures set to 'alert' instead of 'reset-both' or 'block', or the 'rule action' for specific critical vulnerabilities is set too permissively, allowing exploit attempts to succeed. Troubleshooting: Review 'Vulnerability Protection' logs for signature IDs, and check the action for 'critical' or 'high' severity threat IDs relevant to the attack vectors.
E) The 'Data Filtering' security profile is enabled, but the custom data patterns are too generic, leading to high false positives and subsequent disabling of the profile, or they are not configured to detect specific C2 indicators. Troubleshooting: Review 'Data Filtering' logs and policy actions; test with known C2 strings.

4. A large enterprise uses a critical, internally developed database replication service that communicates exclusively between two specific database clusters (Cluster-A and Cluster-B) over TCP/1433 and TCP/50000-50005. App-ID occasionally misidentifies traffic on TCP/1433 as 'ms-sql-smb' and TCP/50000-50005 as 'unknown-tcp'. The security team wants to enforce strict security profiles on this replication traffic, ensuring it's always classified as 'internal-db-replication', a custom application previously defined. Additionally, they need to apply a specific QOS profile. Which set of configurations will best achieve this, considering the need for both precise identification and performance?

A) 1. Create two custom application signatures, one for TCP/1433 and another for TCP/50000-50005, both named 'internal-db-replication'. 2. Create a security policy allowing 'internal-db-replication' between Cluster-A and Cluster-B, applying the desired security and QOS profiles.
B) 1. Create a Service Group including TCP/1433 and TCP/50000-50005. 2. Create a security policy allowing 'any' application with this Service Group between Cluster-A and Cluster-B, applying the security and QOS profiles.
C) 1. Create an Application Filter that includes 'ms-sql-smb' and 'unknown-tcp'. 2. Create a security policy allowing this Application Filter between Cluster-A and Cluster-B, with the desired profiles.
D) 1. Create two Application Override policies:

E) 1. Disable App-ID for all traffic between Cluster-A and Cluster-B. 2. Create a security policy based on IP addresses and ports, applying the security and QOS profiles.

5. A distributed manufacturing company utilizes several IoT devices across its factories that transmit telemetry data via MQTT to a central cloud broker. The MQTT traffic is highly sensitive to packet loss but can tolerate moderate latency. The company has a mix of Satellite, 4G, and MPLS links at each factory. They want an SD-WAN policy that prioritizes MPLS for MQTT, then 4G, and only uses Satellite as a last resort, unless the Satellite link offers exceptionally low packet loss (below 0.1 %) even if its latency is higher than 4G. If no link meets the packet loss requirement for MQTT (i.e., packet loss on all links exceeds 0.5%), the traffic should be dropped to prevent unreliable data transmission. Which SD-WAN configuration achieves this, considering the complex conditional preference for Satellite?

A) Utilize a single SD-WAN policy for MQTT. Define path quality profiles for MPLS, 4G, and Satellite. Implement a custom health check script that dynamically assigns a 'cost' to each link based on current packet loss and latency. The script should assign a very low cost to Satellite if its packet loss is below 0.1%. The SD-WAN policy will then select the lowest cost path. Configure the policy to drop if no path's cost falls below a threshold.
B) Define two SLA profiles: (packet-loss < 0.5%, latency < 200ms) and (packet-loss < 0.1%, latency unlimited). Create an SD-WAN policy for MQTT. Set a primary path group for MPLS and 4G, using Create a secondary path group for Satellite, using 'MQTT Satellite_Exception_SLA'. Configure a 'Fail Action' of 'Drop' if no path in any group meets its respective SLA.
C) Create an SLA profile for MQTT: 'latency < 200mS, 'packet-loss < 0.5%'. Define three path quality profiles: 'MPLS_Q, '4G_Q, 'Satellite_Q. Configure an SD-WAN policy for MQTT, setting the path preference order: MPLS, 4G, Satellite. Configure the 'Fail Action' to 'Drop'. The system will automatically select the best path based on the SLA and preference.
D) Configure an SD-WAN policy for MQTT. create a PBF rule for MQTT traffic that explicitly prefers MPLS, then 4G. create a second PBF rule for MQTT with a lower priority that, under specific conditions (e.g., custom script checking Satellite link quality), forwards traffic to Satellite if its packet loss is below 0.1 %. If no PBF rules are met, rely on a default route to drop traffic.
E) Create an SD-WAN policy for MQTT using 'Dynamic Path Selection'. Define a single SLA profile that prioritizes packet loss over latency. Configure the path preference order for MPLS, then 4G. For Satellite, enable 'Conditional Path Selection' and define a specific condition where Satellite is preferred if its packet loss is below 0.1 overriding the general latency preference. Set the global 'Fail Action' to 'Drop'.

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