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Palo Alto Networks Network Security Analyst Sample Questions:

1. A company wants to implement a 'kill switch' for critical applications. In case of a severe security incident, they need to instantly block all outbound traffic to a specific set of critical external services. The list of these services might change rapidly. How can External Dynamic Lists be leveraged for the most agile response in this scenario?

A) Pre-configure an EDL containing a single, dummy IP address. During an incident, update the EDL source file on an internal web server with the actual critical service IPs/URLs, and the firewall will fetch the changes.
B) Maintain a local file on the firewall with the list of critical services and manually update it during an incident.
C) Integrate with a SOAR platform that can directly push policy updates to the firewall to block the services.
D) Create an EDL with all critical service IPs and URLs, set its update frequency to 'Every Minute', and configure a security policy with a deny rule.
E) Use a script to dynamically update a custom URL category, which is then blocked by a URL filtering profile.

2. A security analyst observes unusual outbound DNS queries for newly registered domains (NRDs) originating from several internal workstations, followed by attempts to establish C2 communication on non-standard ports. This behavior is indicative of a sophisticated malware infection. Which combination of Palo Alto Networks profiles and configurations, applied to outbound security policies, would be most effective in detecting and preventing this type of multi-stage attack?

A) Custom Application Signature for non-standard C2 ports, User-ID for affected users, and a Port-Based Security Policy blocking all non-standard ports.
B) DNS Security Profile (Sinkhole & Block NRD category), Anti-Spyware Profile (DNS Signatures), and WildFire Analysis Profile for all unknown executables.
C) DNS Security Profile (Sinkhole unknown domains, enable DNS signatures), Anti-Spyware Profile (Enable DNS Sinkhole, signatures for C2), WildFire Analysis (all file types), and a Security Policy with application 'ping' and 'web-browsing' explicitly denied on outbound.
D) Vulnerability Protection Profile (Critical severity, Block), Data Filtering Profile (Predefined PII), and QOS profile for suspicious traffic.
E) URL Filtering Profile (Block 'newly-registered-domain' category), Antivirus Profile (Heuristics), and a custom 'File Blocking' profile for all executables.

3. 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. 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.
C) 1. Create two Application Override policies:

D) 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.
E) 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.

4. Consider an advanced SD-WAN deployment using Panorama managing multiple regional hubs and spokes. The design requires that certain high-volume data replication traffic (App-Rep) originating from a spoke must always use the regional hub's primary MPLS path if available. However, if the MPLS path experiences any degradation (even minor), the traffic must immediately switch to a dedicated high-bandwidth IPsec tunnel over the internet, and remain on the IPsec tunnel until the MPLS path is fully restored and stable for a prolonged period (e.g., 5 minutes) to avoid flapping. All other traffic should use standard 'Best Quality' path selection. Which SD-WAN features and their specific configurations are essential to achieve the 'sticky failover' for App-Rep?

A) For App-Rep, use an SD-WAN policy rule with 'Active/Backup' path selection, setting the MPLS link as 'Active' and the IPsec tunnel as 'Backup'. To prevent flapping, disable 'Automatic Failback' for this specific rule, and rely on manual intervention or a separate script to re-enable MPLS when stable.
B) The SD-WAN policy rule for App-Rep should use 'Performance-Based' path selection. The key is to define a 'Path Quality' profile for the MPLS link with precise 'Good' and 'Bad' thresholds. The 'Failback Timer' (or 'Revert Timer') within the SD-WAN profile's 'Advanced Settings' is the mechanism to control the stickiness, ensuring MPLS only becomes active again after prolonged stability.
C) Implement an SD-WAN policy rule for App-Rep using 'Performance-Based' path selection and a 'Path Quality' profile. Configure the 'Path Monitoring' profile for the MPLS link with aggressive probes and a higher 'Consecutive Failures' threshold to quickly detect degradation, and a 'Recovery Wait Time' for the stickiness.
D) For App-Rep, create an SD-WAN policy rule with 'Performance-Based' path selection. Associate it with a 'Path Quality' profile defining strict SLA thresholds for MPLS. Crucially, configure the 'Failback Timer' within the SD-WAN profile or the specific rule to a value like 300 seconds (5 minutes) to achieve stickiness.
E) For App-Rep, define an SD-WAN policy rule with 'Best Quality' path selection. In the associated 'Path Quality' profile for MPLS, set very tight 'Good' thresholds. To enforce stickiness, utilize an 'Application Override' policy to force App-Rep to the IPsec tunnel after the initial failover, and manually remove it when MPLS is stable.

5. A large enterprise with a global presence is deploying Palo Alto Networks firewalls across hundreds of branch offices. The security team needs to ensure consistent security policies, network configurations, and software versions across all devices, while also allowing localized administrative control for specific regions without compromising central oversight. They are currently struggling with policy sprawl and inconsistent configurations due to a lack of a standardized management approach.

A) Deploy a single, monolithic firewall and route all branch traffic through it to simplify policy management.
B) Implement Panorama as a centralized management system, utilizing Device Groups to logically organize firewalls and manage shared policies. Then, use Administrative Roles to delegate granular access based on regions.
C) Utilize an Ansible playbook to push configurations to all firewalls, relying solely on automation for consistency.
D) Use a third-party SIEM solution to monitor firewall configurations and manually correct any discrepancies.
E) Manage each firewall individually via its web interface and create custom policy sets for each branch based on regional requirements.

Solutions: