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Palo Alto Networks Network Security Analyst Sample Questions:

1. A Palo Alto Networks firewall configured with GlobalProtect VPN is experiencing an issue where remote users can establish a VPN connection but cannot access any internal network resources. Troubleshooting steps confirm that client-side routing is correct, and the VPN tunnel is established. The GlobalProtect gateway security policy logs show 'deny' actions with 'Application: incomplete' and 'Service: unknown-tcp'. Which combination of factors is most likely contributing to this problem?

A) Missing or incorrect security policy rules allowing traffic from the GlobalProtect tunnel zone to internal zones, combined with a 'Service: application-default' setting that is preventing proper App-ID classification initially.
B) The GlobalProtect gateway is configured for SSL VPN but the client is attempting to connect via IPsec, leading to protocol mismatch and decryption failure.
C) The 'tunnel interface' for GlobalProtect is incorrectly assigned to a virtual router that does not have routes to the internal networks.
D) Incorrect source NAT configuration on the GlobalProtect security policy and a missing security zone for the VPN tunnel interface.
E) Certificate validation failure between the GlobalProtect client and the gateway, preventing session establishment beyond the initial handshake.

2. You are debugging a connectivity issue where an internal application server, running a custom SSH service on port 2222, cannot establish connections to an external cloud logging service. The firewall logs show 'deny' actions with application 'ssh' and service 'application-default', even though a specific policy rule allows 'custom_ssh_app' (a custom App-ID for port 2222) to the logging service. What is the most likely cause and solution?

A) The security policy rule for 'custom_ssh_app' has a lower priority than a generic 'deny all SSH' rule. The solution is to move the 'custom_ssh_app' rule to a higher priority.
B) The traffic is being identified as 'application-incomplete' before the custom App-ID can classify it. The solution is to allow 'application-incomplete' for the destination IP, then refine the rule.
C) The custom App-ID 'custom_ssh_app' is incorrectly defined and is not identifying the traffic as SSH. The solution is to redefine the custom App-ID to accurately match the SSH handshake on port 2222.
D) The firewall is correctly identifying the traffic as standard SSH (App-ID: ssh) despite the custom port. The solution is to modify the allowing rule to explicitly allow 'ssh' application and 'tcp/2222' as the service.
E) The issue is with Application Override. The firewall is incorrectly overriding the custom App-ID with the default 'ssh' App-I The solution is to remove any Application Override rules that might conflict with this custom application.

3. A Security Administrator reports that users are unable to access certain web applications after a recent Panorama template push. The applications use non-standard ports, and the security policy explicitly allows traffic on these ports. Traffic logs show sessions being dropped with the reason 'application-default'. Which of the following is the most probable cause of this misconfiguration?

A) The application identification (App-ID) for the custom web applications is incorrectly defined or not being learned.
B) The Panorama template push contained a commit scope error, not applying the new policies to the correct device group.
C) The security policy is missing the 'service' object for the non-standard ports, defaulting to 'application-default' port inspection.
D) The decryption profile is not applied, preventing proper App-ID classification for SSL/TLS encrypted traffic.
E) The Zone Protection Profile applied to the ingress zone is blocking non-standard application traffic.

4. A Security Administrator is implementing a new policy on a Palo Alto Networks firewall. The requirement is to allow specific internal users access to Salesforce, but only for the 'Sales Cloud' application, and block all other Salesforce functionalities. The organization also wants to enforce strict file transfer restrictions within this allowed Salesforce access. Which combination of Security Policy elements and profiles would be most effective and precise in achieving this goal?

A) Source Zone: Trust, Source User: any, Destination Zone: Untrust, Application: salesforce-base, Service: tcp/443, Actions: allow, Profile: Data Filtering Profile (block sensitive data).
B) Source Zone: Trust, Source User: sales_team_group, Destination Zone: Untrust, Application: salesforce-base, Service: application-default, Actions: allow, Profile: File Blocking Profile (block all files).
C) Source Zone: Trust, Source User: sales_team_group, Destination Zone: Untrust, Application: any, Service: application-default, Actions: allow, Profile: URL Filtering Profile (allow salesforce.com), File Blocking Profile (block all files).
D) Source Zone: Trust, Source User: sales_team_group, Destination Zone: Untrust, Application: salesforce-salescloud, Service: application-default, Actions: allow, Profile: File Blocking Profile (block executable & archives), Data Filtering Profile (block PII), Antivirus Profile, Vulnerability Protection Profile.
E) Source Zone: Trust, Source IJser: sales_team_group, Destination Zone: Untrust, Application: salesforce-salescloud, Service: application-default, Actions: allow, Profile: File Blocking Profile (block executable & archives), WildFire Analysis Profile.

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'.

Solutions: