PSE-Strata-Pro-24 Palo Alto Networks Systems Engineer Professional - Hardware Firewall Questions and Answers

In this scenario, the company does not use on-premises Active Directory and manages devices with Entra ID and Jamf, which implies a cloud-native and modern management setup. Below is the evaluation of each option:

Option A: Captive portal

Captive portal is typically used in environments where identity mapping is needed for unmanaged devices or guest users. It provides a mechanism for users to authenticate themselves through a web interface.

However, in this case, the company is managing devices using Entra ID and Jamf, which means identity information can already be centralized through other means. Captive portal is not an ideal solution here.

This option is not appropriate.

Option B: User-ID agents configured for WMI client probing

WMI (Windows Management Instrumentation) client probing is a mechanism used to map IP addresses to usernames in a Windows environment. This approach is specific to on-premises Active Directory deployments and requires direct communication with Windows endpoints.

Since the company does not have an on-premises AD and is using Entra ID and Jamf, this method is not applicable.

This option is not appropriate.

Option C: GlobalProtect with an internal gateway deployment

GlobalProtect is Palo Alto Networks' VPN solution, which allows for secure remote access. It also supports identity-based mapping when deployed with internal gateways.

In this case, GlobalProtect with an internal gateway can serve as a mechanism to provide user and device visibility based on the managed devices connecting through the gateway.

This option is appropriate.

Option D: Cloud Identity Engine synchronized with Entra ID

The Cloud Identity Engine provides a cloud-based approach to synchronize identity information from identity providers like Entra ID (formerly Azure AD).

In a cloud-native environment with Entra ID and Jamf, the Cloud Identity Engine is a natural fit as it integrates seamlessly to provide identity visibility for applications and data.

This option is appropriate.

Cobalt Strike is a popular post-exploitation framework often used by attackers for Command and Control (C2) operations. Malleable C2 profiles allow attackers to modify the behavior of their C2 communication, making detection more difficult. Stopping these attacks in real time requires deep inline inspection and the ability to block zero-day and evasive threats.

Why "Advanced Threat Prevention and PAN-OS 10.2" (Correct Answer B)?Advanced Threat Prevention (ATP) on PAN-OS 10.2 uses inline deep learning models to detect and block Cobalt Strike Malleable C2 attacks in real time. ATP is designed to prevent evasive techniques and zero-day threats, which is essential for blocking Malleable C2. PAN-OS 10.2 introduces enhanced capabilities for detecting malicious traffic patterns and inline analysis of encrypted traffic.

ATP examines traffic behavior and signature-less threats, effectively stopping evasive C2 profiles.

PAN-OS 10.2 includes real-time protections specifically for Malleable C2.

Why not "Next-Generation CASB on PAN-OS 10.1" (Option A)?Next-Generation CASB (Cloud Access Security Broker) is designed to secure SaaS applications and does not provide the inline C2 protection required to stop Malleable C2 attacks. CASB is not related to Command and Control detection.

Why not "Threat Prevention and Advanced WildFire with PAN-OS 10.0" (Option C)?Threat Prevention and Advanced WildFire are effective for detecting and preventing malware and known threats. However, they rely heavily on signatures and sandboxing for analysis, which is not sufficient for stopping real-time evasive C2 traffic. PAN-OS 10.0 lacks the advanced inline capabilities provided by ATP in PAN-OS 10.2.

Why not "DNS Security, Threat Prevention, and Advanced WildFire with PAN-OS 9.x" (Option D)?While DNS Security and Threat Prevention are valuable for blocking malicious domains and known threats, PAN-OS 9.x does not provide the inline deep learning capabilities needed for real-time detection and prevention of Malleable C2 attacks. The absence of advanced behavioral analysis in PAN-OS 9.x makes this combination ineffective against advanced C2 attacks.

A perimeter firewall is traditionally deployed at the boundary of a network to protect it from external threats. It provides a variety of protections, including blocking unauthorized access, inspecting traffic flows, and safeguarding sensitive resources. Here is how the options apply:

Option A (Correct): Perimeter firewalls provide network layer protection by filtering and inspecting traffic entering or leaving the network at the outer edge. This is one of their primary roles.

Option B: Power utilization is not a functional or architectural aspect of a firewall and is irrelevant when describing the purpose of a perimeter firewall.

Option C: Securing east-west traffic is more aligned with data center firewalls, which monitor lateral (east-west) movement of traffic within a virtualized or segmented environment. A perimeter firewall focuses on north-south traffic instead.

Option D (Correct): A perimeter firewall primarily secures north-south traffic, which refers to traffic entering and leaving the network. It ensures that inbound and outbound traffic adheres to security policies.

Option E (Correct): Perimeter firewalls play a critical role in guarding against external attacks, such as DDoS attacks, malicious IP traffic, and other unauthorized access attempts.

DNS Security (Answer C):

DNS Security is the appropriate subscription for addressing threats over port 53.

DNS tunneling is a common method used for data exfiltration, infiltration, and C2 activities, as it allows malicious traffic to be hidden within legitimate DNS queries.

The DNS Security service applies machine learning models to analyze DNS queries in real-time, block malicious domains, and prevent tunneling activities.

It integrates seamlessly with the NGFW, ensuring advanced protection against DNS-based threats without requiring additional infrastructure.

Why Not Threat Prevention (Answer A):

Threat Prevention is critical for blocking malware, exploits, and vulnerabilities, but it does not specifically address DNS-based tunneling or C2 activities over port 53.

Why Not App-ID and Data Loss Prevention (Answer B):

While App-ID can identify applications, and Data Loss Prevention (DLP) helps prevent sensitive data leakage, neither focuses on blocking DNS tunneling or malicious activity over port 53.

Why Not Advanced Threat Prevention and Advanced URL Filtering (Answer D):

Advanced Threat Prevention and URL Filtering are excellent for broader web and network threats, but DNS tunneling specifically requires the DNS Security subscription, which specializes in DNS-layer threats.

References from Palo Alto Networks Documentation:

DNS Security Subscription Overview

The PA-400 Series is the most cost-efficient Palo Alto Networks NGFW for small branch offices. Let’s analyze the options:

PA-400 Series (Recommended Option)

The PA-400 Series (PA-410, PA-415, etc.) is specifically designed for small to medium-sized branch offices with fewer than 50 users.

It provides all the necessary security features, including Advanced Threat Prevention, at a lower price point compared to higher-tier models.

It supports PAN-OS and Cloud-Delivered Security Services (CDSS), making it suitable for securing internet traffic at branch locations.

Why Other Options Are Incorrect

PA-200: The PA-200 is an older model and is no longer available. It lacks the performance and features needed for modern branch office security.

PA-500: The PA-500 is also an older model that is not as cost-efficient as the PA-400 Series.

PA-600: The PA-600 Series does not exist.

Key Takeaways:

For branch offices with fewer than 50 users, the PA-400 Series offers the best balance of cost and performance.

When adopting additional security features over time, remaining aligned with Zero Trust principles requires a focus on constant visibility, control, and adherence to best practices. The following actions are the most relevant:

Why "Apply decryption where possible to inspect and log all new and existing traffic flows" (Correct Answer B)?Zero Trust principles emphasize visibility into all traffic, whether encrypted or unencrypted. Without decryption, encrypted traffic becomes a blind spot, which attackers can exploit. By applying decryption wherever feasible, organizations ensure they can inspect, log, and enforce policies on encrypted traffic, thus adhering to Zero Trust principles.

Why "Use the Best Practice Assessment (BPA) tool to measure progress toward Zero Trust principles" (Correct Answer C)?The BPA tool provides detailed insights into the customer’s security configuration, helping measure alignment with Palo Alto Networks’ Zero Trust best practices. It identifies gaps in security posture and recommends actionable steps to strengthen adherence to Zero Trust principles over time.

Why not "Turn on all licensed Cloud-Delivered Security Services (CDSS) subscriptions in blocking mode for all policies" (Option A)?While enabling CDSS subscriptions (like Threat Prevention, URL Filtering, Advanced Threat Prevention) in blocking mode can enhance security, it is not an action specifically tied to maintaining alignment with Zero Trust principles. A more holistic approach, such as decryption and BPA analysis, is critical to achieving Zero Trust.

Why not "Use the Policy Optimizer tool to understand security rules allowing users to bypass decryption" (Option D)?Policy Optimizer is used to optimize existing security rules by identifying unused or overly permissive policies. While useful, it does not directly address alignment with Zero Trust principles or help enforce decryption.

Step 1: Understanding User-to-IP Mappings

User-to-IP mappings are the foundation of User-ID, a core feature of Strata Hardware Firewalls (e.g., PA-400 Series, PA-5400 Series). These mappings link a user’s identity (e.g., username) to their device’s IP address, enabling policy enforcement based on user identity rather than just IP. Palo Alto Networks supports multiple methods to populate these mappings, depending on the network environment and authentication mechanisms.

Purpose: Allows the firewall to apply user-based policies, monitor user activity, and generate user-specific logs.

Strata Context: On a PA-5445, User-ID integrates with App-ID and security subscriptions to enforce granular access control.

To help a customer understand how Palo Alto Networks can bring value when adopting a Zero Trust architecture, the systems engineer must focus on understanding the customer's specific needs and explaining how the Zero Trust strategy aligns with their business goals. Here’s the detailed analysis of each option:

Option A: Ask the customer about their internal business flows, such as how their users interact with applications and data across the infrastructure

Understanding the customer's internal workflows and how their users interact with applications and data is a critical first step in Zero Trust. This information allows the systems engineer to identify potential security gaps and suggest tailored solutions.

This is correct.

Option B: Explain how Palo Alto Networks can place virtual NGFWs across the customer's network to ensure assets and traffic are seen and controlled

While placing NGFWs across the customer's network may be part of the implementation, this approach focuses on the product rather than the customer's strategy. Zero Trust is more about policies and architecture than specific product placement.

This is incorrect.

Option C: Use the Zero Trust Roadshow package to demonstrate to the customer how robust Palo Alto Networks capabilities are in meeting Zero Trust

While demonstrating capabilities is valuable during the later stages of engagement, the initial focus should be on understanding the customer's business requirements rather than showcasing products.

This is incorrect.

Option D: Ask the customer about their approach to Zero Trust, explaining that it is a strategy more than it is something they purchase

Zero Trust is not a product but a strategy that requires a shift in mindset. By discussing their approach, the systems engineer can identify whether the customer understands Zero Trust principles and guide them accordingly.

This is correct.

DNS-based threats, such as DNS tunneling, phishing, or malware command-and-control (C2) activities, are commonly used by attackers to exfiltrate data or establish malicious communications. Palo Alto Networks firewalls provide several mechanisms to address these threats, and the correct method is DNS sinkholing.

Why "DNS sinkholing" (Correct Answer D)?DNS sinkholing redirects DNS queries for malicious domains to an internal or non-routable IP address, effectively preventing communication with malicious domains. When a user or endpoint tries to connect to a malicious domain, the sinkhole DNS entry ensures the traffic is blocked or routed to a controlled destination.

DNS sinkholing is especially effective for blocking malware trying to contact its C2 server or preventing data exfiltration.

Why not "DNS proxy" (Option A)?A DNS proxy is used to forward DNS queries from endpoints to an upstream DNS server. While it can be part of a network's DNS setup, it does not actively stop DNS-based threats.

Why not "Buffer overflow protection" (Option B)?Buffer overflow protection is a method used to prevent memory-related attacks, such as exploiting software vulnerabilities. It is unrelated to DNS-based threat prevention.

Why not "DNS tunneling" (Option C)?DNS tunneling is itself a type of DNS-based threat where attackers encode malicious traffic within DNS queries and responses. This option refers to the threat itself, not the method to stop it.

Advanced WildFire is Palo Alto Networks' cloud-based malware analysis and prevention solution. It determines whether files are malicious by executing them in a sandbox environment and observing their behavior. To address the customer's concern about the file categorization, the systems engineer must provide evidence of the file's behavior. Here’s the analysis of each option:

Option A: Review the threat logs for information to provide to the customer

Threat logs can provide a summary of events and verdicts for malicious files, but they do not include the detailed behavior analysis needed to convince the customer.

While reviewing the logs is helpful as a preliminary step, it does not provide the level of proof the customer needs.

This option is not sufficient on its own.

Option B: Use the WildFire Analysis Report in the log to show the customer the malicious actions the file took when it was detonated

WildFire generates an analysis report that includes details about the file's behavior during detonation in the sandbox, such as network activity, file modifications, process executions, and any indicators of compromise (IoCs).

This report provides concrete evidence to demonstrate why the file was flagged as malicious. It is the most accurate way to assure the customer that WildFire's decision was based on observed malicious actions.

This is the best option.

Option C: Open a TAG ticket for the customer and allow support engineers to determine the appropriate action

While opening a support ticket is a valid action for further analysis or appeal, it is not a direct way to assure the customer of the current WildFire verdict.

This option does not directly address the customer’s request for immediate proof.

This option is not ideal.

Option D: Do nothing because the customer will realize Advanced WildFire is right

This approach is dismissive of the customer's concerns and does not provide any evidence to support WildFire's decision.

This option is inappropriate.

The appropriate CDSS subscription to inspect and mitigate suspicious DNS traffic is Advanced DNS Security. Here’s why:

Advanced DNS Security protects against DNS-based threats, including domain generation algorithms (DGA), DNS tunneling (often used for data exfiltration), and malicious domains used in attacks. It leverages machine learning to detect and block DNS traffic associated with command-and-control servers or other malicious activities. In this case, unusually high DNS traffic to an unfamiliar IP address is likely indicative of a DNS-based attack or malware activity, making this the most suitable service.

Option A: Advanced Threat Prevention (ATP) focuses on identifying and blocking sophisticated threats in network traffic, such as exploits and evasive malware. While it complements DNS Security, it does not specialize in analyzing DNS-specific traffic patterns.

Option B: Advanced WildFire focuses on detecting and preventing file-based threats, such as malware delivered via email attachments or web downloads. It does not provide specific protection for DNS-related anomalies.

Option C: Advanced URL Filtering is designed to prevent access to malicious or inappropriate websites based on their URLs. While DNS may be indirectly involved in resolving malicious websites, this service does not directly inspect DNS traffic patterns for threats.

Option D (Correct): Advanced DNS Security specifically addresses DNS-based threats. By enabling this service, the customer can detect and block DNS queries to malicious domains and investigate anomalous DNS behavior like the high traffic observed in this scenario.

How to Enable Advanced DNS Security:

Ensure the firewall has a valid Advanced DNS Security license.

Navigate to Objects > Security Profiles > Anti-Spyware.

Enable DNS Security under the "DNS Signatures" section.

Apply the Anti-Spyware profile to the relevant Security Policy to enforce DNS Security.

SASE (Secure Access Service Edge) is a cloud-based solution that combines networking and security capabilities to address modern enterprise needs. However, there are scenarios where an on-premises solution is more appropriate.

A. High growth phase with existing and planned mergers, and with acquisitions being integrated.

This scenario typically favors a SASE solution since it provides flexible, scalable, and centralized security that is ideal for integrating newly acquired businesses.

B. Most employees and applications in close physical proximity in a geographic region.

This scenario supports the choice of an on-premises solution. When employees and applications are concentrated in a single geographic region, traditional on-premises firewalls and centralized security appliances provide cost-effective and efficient protection without the need for distributed, cloud-based infrastructure.

C. Hybrid work and cloud adoption at various locations that have different requirements per site.

This scenario aligns with a SASE solution. Hybrid work and varying site requirements are better addressed by SASE’s ability to provide consistent security policies regardless of location.

D. The need to enable business to securely expand its geographical footprint.

Expanding into new geographic areas benefits from the scalability and flexibility of a SASE solution, which can deliver consistent security globally without requiring physical appliances at each location.

Key Takeaways:

On-premises solutions are ideal for geographically concentrated networks with minimal cloud adoption.

SASE is better suited for hybrid work, cloud adoption, and distributed networks.

Zero Trust principles revolve around minimizing trust in the network and verifying every interaction. To adopt Zero Trust, customers should start by gaining visibility and understanding the network and its transactions.

A. Understand which users, devices, infrastructure, applications, data, and services are part of the network or have access to it.

The first step in adopting Zero Trust is understanding the full scope of the network. Identifying users, devices, applications, and data is critical for building a comprehensive security strategy.

C. Map the transactions between users, applications, and data, then verify and inspect those transactions.

After identifying all assets, the next step is to map interactions and enforce verification and inspection of these transactions to ensure security.

Why Other Options Are Incorrect

B: Enabling CDSS subscriptions is important for protection but comes after foundational Zero Trust principles are established.

D: Implementing VM-Series NGFWs is part of enforcing Zero Trust, but it is not the first step. Visibility and understanding come first.

Advanced DNS Security on Palo Alto Networks firewalls is designed to identify and prevent a wide range of DNS-based attacks. Among the listed options, "High entropy DNS domains" is a specific example of a DNS attack that Advanced DNS Security can detect and block.

Why "High entropy DNS domains" (Correct Answer A)?High entropy DNS domains are often used in attacks where randomly generated domain names (e.g., gfh34ksdu.com) are utilized by malware or bots to evade detection. This is a hallmark of Domain Generation Algorithms (DGA)-based attacks. Palo Alto Networks firewalls with Advanced DNS Security use machine learning to detect such domains by analyzing the entropy (randomness) of DNS queries. High entropy values indicate the likelihood of a dynamically generated or malicious domain.

Why not "Polymorphic DNS" (Option B)?While polymorphic DNS refers to techniques that dynamically change DNS records to avoid detection, it is not specifically identified as an attack type mitigated by Advanced DNS Security in Palo Alto Networks documentation. The firewall focuses more on the behavior of DNS queries, such as detecting DGA domains or anomalous DNS traffic patterns.

Why not "CNAME cloaking" (Option C)?CNAME cloaking involves using CNAME records to redirect DNS queries to malicious or hidden domains. Although Palo Alto firewalls may detect and block malicious DNS redirections, the focus of Advanced DNS Security is primarily on identifying patterns of DNS abuse like DGA domains, tunneling, or high entropy queries.

Why not "DNS domain rebranding" (Option D)?DNS domain rebranding involves changing the domain names associated with malicious activity to evade detection. This is typically a tactic used for persistence but is not an example of a DNS attack type specifically addressed by Advanced DNS Security.

Advanced DNS Security focuses on dynamic, real-time identification of suspicious DNS patterns, such as high entropy domains, DNS tunneling, or protocol violations. High entropy DNS domains are directly tied to attack mechanisms like DGAs, making this the correct answer.