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Palo Alto Networks Network Security Analyst Sample Questions:

1. A Palo Alto Networks firewall configured as an active/passive HA pair is experiencing split-brain scenarios, where both firewalls briefly become active, causing network disruption. Packet captures on the HA interfaces show intermittent high latency and packet loss. The 'HA Link Monitoring' and 'Path Monitoring' are configured. Which of the following is the most likely, yet often overlooked, cause of this complex HA instability?

A) The firewall's management plane is overloaded, causing delays in processing HA state changes and elections.
B) Asymmetric routing in the network, where return traffic for the HA monitoring probes is taking a different path, causing probes to fail intermittently.
C) Network congestion or faulty cabling on the dedicated HA data link (HAI or HA2), leading to missed heartbeats and false failures.
D) Mismatched software versions between the active and passive firewalls, leading to protocol negotiation issues for HA synchronization.
E) Incorrectly configured preemption settings on the passive device, allowing it to become active prematurely.

2. A Palo Alto Networks firewall, part of an HAActive/Passive pair, is experiencing frequent failovers. The logs indicate:

Upon investigation, the physical link for ethernetl/1 (HAI control link) appears to be up and connected, and there are no direct errors on the interface. However, the failovers persist. What is the MOST intricate troubleshooting step to perform given this scenario?

A) Review the 'System > HA > Path Monitoring' configuration to identify if a monitored data interface is failing.
B) Confirm that the HA primary and secondary IP addresses for HAI are correctly configured and are in the same subnet.
C) Examine the 'debug swm log' and 'debug pcom log' output on both firewalls for specific heartbeat packet drops, CPU spikes, or process crashes affecting the HA daemon.
D) Verify the cable and SFP module for ethernetl/1 on both HA peers and replace if faulty.
E) Check the HA interface monitoring settings and adjust the heartbeat interval or failover detection time.

3. An organization is migrating its cloud applications from a public internet connection to a dedicated AWS Direct Connect link through a Palo Alto Networks firewall. To achieve this, all traffic to AWS public IP ranges (e.g., EC2, S3) from the internal network must be forwarded over the Direct Connect interface (ethernet1/3) with a specific next-hop router. Other internet-bound traffic should continue using the primary internet uplink (ethernet1/1 ). Which of the following PBF actions are critical to ensure that if the Direct Connect link fails, the AWS-bound traffic automatically fails over to the primary internet uplink without manual intervention?

A) Configure a PBF rule with 'Action: Forward', 'Egress Interface: ethernet1/3', 'Next Hop: AWS Router_IP', and then create a second PBF rule with a higher priority for the same AWS destinations pointing to ethernet1/1 , which will only activate manually.
B) Set up a static route for the AWS ranges with ethernet1/3 as the next hop, and configure BIDirectional Forwarding Detection (BFD) on the Direct Connect interface.
C) Implement an ECMP route for the AWS public IP ranges, distributing traffic between ethernet1/3 and ethernet1/1 based on load.
D) Create a PBF rule with 'Action: Forward', 'Egress Interface: ethernet1/3', 'Next Hop: AWS_Router_IP', and specify 'Fall back to: Yes' with the primary internet uplink's virtual router and next-hop.
E) Configure a PBF rule with 'Action: Forward', 'Egress Interface: ethernet1/3', 'Next Hop: AWS_Router_IP', and enable 'Monitor Link Group' for ethernet1/3 to trigger a route removal.

4. A company is experiencing performance issues with their cloud-based CRM application (e.g., Salesforce), which uses App-ID: salesforce-base. Users in remote branches report slow response times, even though their internet links appear healthy. Investigation reveals occasional transient packet loss spikes and latency jitter affecting the application's performance. The network team wants to implement an SD-WAN policy that proactively steers Salesforce traffic away from paths experiencing degradation, even if the degradation is intermittent and temporary. Which of the following is the most appropriate configuration?

A) Define an SD-WAN policy for Salesforce. Use 'Dynamic Path Selection' with an SLA profile that monitors latency, jitter, and packet loss. Set the 'Path Selection Type' to 'Best Path' and configure multiple preferred paths. The system will continuously evaluate paths and select the one currently meeting the SLA.
B) Configure health checks on all internet-facing interfaces. If any interface experiences degradation, manually disable that interface in the network configuration to force traffic to other links.
C) Utilize a standard static route for Salesforce traffic to a primary internet link. Implement BFD (Bidirectional Forwarding Detection) on the link to rapidly detect failures and switch to a pre-configured backup static route.
D) Create an SLA profile for Salesforce with strict thresholds for latency and packet loss. Configure a PBF rule for Salesforce traffic, and within the PBF, specify a primary path and a secondary path. The PBF will automatically failover if the primary path violates the SL
E) Implement QOS policies on the WAN interfaces to prioritize Salesforce traffic. Configure a separate security policy for Salesforce to always use the most direct internet link, bypassing SD-WAN intelligence.

5. A critical industrial control system (ICS) network, isolated from the internet, requires extremely low latency and high availability. While internal DoS attacks are rare, a misconfigured or rogue device could potentially flood the network. The security team wants to implement a DoS protection profile that proactively identifies and drops unusually high rates of UDP traffic targeting specific ICS application ports, without introducing any significant processing overhead or latency. Which configuration approach in Palo Alto Networks firewall DoS protection would best achieve this goal?

A) Apply an 'IP Address Block' profile to the ICS interface, monitoring for any source IP exceeding a 'Session Rate' of 100 sessions/second and blocking for 300 seconds.
B) Utilize 'Packet Based Attack Protection' within a 'DoS Protection Policy' rule, targeting 'UDP Flood' on specific destination ports, and configure a 'Per-Packet Rate' threshold with 'Action: Drop'.
C) Implement a 'Data Filtering' profile to identify specific UDP payload patterns associated with ICS applications and block traffic not conforming to these patterns.
D) Configure a 'Zone Protection' profile for the ICS zone with 'Flood Protection' enabled for 'UDP Flood', setting a 'Per-Packet Rate' threshold and 'Action: Drop'.
E) Create a 'DoS Protection Policy' rule with 'Packet Based Attack Protection' for 'UDP Flood' and specify the target application ports, setting 'Action: Syn-Cookie' to mitigate.

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