PSE-Strata-Pro-24 Practice Exam Questions and Answers

Aperimeter firewallis 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 providenetwork layer protectionby 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 withdata 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 securesnorth-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 inguarding against external attacks, such as DDoS attacks, malicious IP traffic, and other unauthorized access attempts.

References:

Palo Alto Networks Firewall Deployment Use Cases: https://docs.paloaltonetworks.com

Security Reference Architecture for North-South Traffic Control.

5G Security (Answer A):

In this scenario, the mining company operates on a private mobile network, likely powered by5G technologyto ensure low latency and high bandwidth for controlling robots and vehicles.

Palo Alto Networks5G Securityis specifically designed to protect private mobile networks. It prevents exploitation of vulnerabilities in the 5G infrastructure and ensures the control signals sent to the machines arenot compromisedby attackers.

Key features include network slicing protection, signaling plane security, and secure user plane communications.

IoT Security (Answer C):

The mining operation depends on machines and remote-controlled vehicles, which are IoT devices.

Palo Alto NetworksIoT Securityprovides:

Full device visibilityto detect all IoT devices (such as robots, remote vehicles, or sensors).

Behavioral analysisto create risk profiles and identify anomalies in themachines' operations.

This ensures a secure environment for IoT devices, reducing the risk of a device being exploited.

Why Not Cloud NGFW (Answer B):

WhileCloud NGFWis critical for protecting cloud-based applications, the specific concern here isprotecting control signals and IoT devicesrather than external access into the cloud service.

The private mobile network and IoT device protection requirements make5G SecurityandIoT Securitymore relevant.

Why Not Advanced CDSS Bundle (Answer D):

The Advanced CDSS bundle (Advanced Threat Prevention, Advanced WildFire, Advanced URL Filtering) is essential for securing web traffic and detecting threats, but it does not address thespecific challenges of securing private mobile networksandIoT devices.

While these services can supplement the design, they are not theprimary focusin this use case.

References from Palo Alto Networks Documentation:

5G Security for Private Mobile Networks

IoT Security Solution Brief

Cloud NGFW Overview

The customer’s question focuses on how Palo Alto Networks Strata Hardware Firewalls maintain throughput performance as more Cloud-Delivered Security Services (CDSS) subscriptions—such as Threat Prevention, URL Filtering, WildFire, DNS Security, and others—are enabled. Unlike traditional firewalls where enabling additional security features often degrades performance, Palo Alto Networks leverages its unique architecture to minimize this impact. The systems engineer (SE) should explain two key concepts—Parallel ProcessingandSingle Pass Architecture—which are foundational to the firewall’s ability to sustain throughput. Below is a detailed explanation, verified against Palo Alto Networks documentation.

Step 1: Understanding Cloud-Delivered Security Services (CDSS) and Performance Concerns

CDSS subscriptions enhance the Strata Hardware Firewall’s capabilities by integrating cloud-based threat intelligence and advanced security features into PAN-OS. Examples include:

Threat Prevention: Blocks exploits, malware, and command-and-control traffic.

WildFire: Analyzes unknown files in the cloud for malware detection.

URL Filtering: Categorizes and controls web traffic.

Traditionally, enabling such services on other firewalls increases processing overhead, as each feature requires separate packet scans or additional hardware resources, leading to latency and throughput loss. Palo Alto Networks claims consistent performance due to its innovative design, rooted in theSingle Pass Parallel Processing (SP3)architecture.

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 thenetwork 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.

The customer’s CIO highlights two key pain points: (1) the operations team lacks expertise to efficiently manage PAN-OS upgrades and support interactions, diverting focus from valuable tasks, and (2) the company lacked tools to monitor NGFW capacity, leading to a rushed upgrade. The goal is to recommend long-term solutions leveraging Palo Alto Networks’ offerings for Strata Hardware Firewalls. Options B and D—training and AIOps Premium within Strata Cloud Manager (SCM)—address these issues by enhancing team capability and providing proactive management tools. Below is a detailed explanation, verified against official documentation.

Step 1: Analyzing the Customer’s Challenges

Expertise Gap: The CIO notes that identifying issues and engaging support requires expertise the operations team doesn’t fully have or can’t prioritize. Upgrading PAN-OS on Strata NGFWs involves tasks like version compatibility checks, pre-upgrade validation, and troubleshooting, which demand familiarity with PAN-OS tools and processes.

Capacity Visibility: The rushed upgrade stemmed from not knowing the NGFWs were nearing capacity (e.g., CPU, memory, session limits), indicating a lack of monitoring or predictive analytics.

Long-term solutions must address both operational efficiency and proactive capacity management, aligning with Palo Alto Networks’ ecosystem for Strata firewalls.

Palo Alto Networks AIOps for NGFW is a cloud-delivered service that leverages telemetry data and machine learning (ML) to provide proactive operational insights, best practice recommendations, and issue prevention.

Why "It is offered in two license tiers: a free version and a premium version" (Correct Answer B)?AIOps for NGFW is available in two tiers:

Free Tier:Provides basic operational insights and best practices at no additional cost.

Premium Tier:Offers advanced capabilities, such as AI-driven forecasts, proactive issue prevention, and enhanced ML-based recommendations.

Why "It uses telemetry data to forecast, preempt, or identify issues, and it uses machine learning (ML) to adjust and enhance the process" (Correct Answer C)?AIOps uses telemetry data from NGFWs to analyze operational trends, forecast potential problems, and recommend solutions before issues arise. ML continuously refines these insights by learning from real-world data, enhancing accuracy and effectiveness over time.

Why not "It is offered in two license tiers: a commercial edition and an enterprise edition" (Option A)?This is incorrect because the licensing model for AIOps is based on "free" and "premium" tiers, not "commercial" and "enterprise" editions.

Why not "It forwards log data to Advanced WildFire to anticipate, prevent, or identify issues, and it uses machine learning (ML) to refine and adapt to the process" (Option D)?AIOps does not rely on Advanced WildFire for its operation. Instead, it uses telemetry data directly from the NGFWs to perform operational and security analysis.

When planning a firewall deployment with SSL/TLS decryption enabled, it is crucial to consider the additional processing overhead introduced by decrypting and inspecting encrypted traffic. Here are the details for each statement:

Why "SSL decryption traffic amounts vary from network to network" (Correct Answer A)?SSL decryption traffic varies depending on the organization’s specific network environment, user behavior, and applications. For example, networks with heavy web traffic, cloud applications, or encrypted VoIP traffic will have more SSL/TLS decryption processing requirements. This variability means each deployment must be properly assessed and sized accordingly.

Why "Perfect Forward Secrecy (PFS) ephemeral key exchange algorithms such as Diffie-Hellman Ephemeral (DHE) and Elliptic-Curve Diffie-Hellman Exchange (ECDHE) consume more processing resources than Rivest-Shamir-Adleman (RSA) algorithms" (Correct Answer C)?PFS algorithms like DHE and ECDHE generate unique session keys for each connection, ensuring better security but requiring significantly more processing power compared to RSA key exchange. When decryption is enabled, firewalls must handle these computationally expensive operations for every encrypted session, impacting performance and sizing requirements.

Why not "Large average transaction sizes consume more processing power to decrypt" (Option B)?While large transaction sizes can consume additional resources, SSL/TLS decryption is more dependent on the number of sessions and the complexity of the encryption algorithms used, rather than the size of the transactions. Hence, this is not a primary best practice consideration.

Why not "Rivest-Shamir-Adleman (RSA) certificate authentication method consumes more resources than Elliptic Curve Digital Signature Algorithm (ECDSA), but ECDSA is more secure" (Option D)?This statement discusses certificate authentication methods, not SSL/TLS decryption performance. While ECDSA is more efficient and secure than RSA, it is not directly relevant to sizing considerations for firewall deployments with decryption enabled.