Palo Alto Certifications and Accreditations Changed PCNSE Questions

The two key exchange algorithms that consume the most resources when decrypting SSL traffic are ECDHE and DHE. These are both Diffie-Hellman based algorithms that enable perfect forward secrecy (PFS), which means that they generate a new and unique session key for each SSL/TLS session, and do not reuse any previous keys. This enhances the security of the encrypted communication, but also increases the computational cost and complexity of the key exchange process. ECDHE stands for Elliptic Curve Diffie-Hellman Ephemeral, which uses elliptic curve cryptography (ECC) to generate the session key. DHE stands for Diffie-Hellman Ephemeral, which uses modular arithmetic to generate the session key. Both ECDHE and DHE require more CPU and memory resources than RSA, which is a non-PFS algorithm that uses public and private keys to encrypt and decrypt the session key123. References: Key Exchange Algorithms, Best Practices for Enabling SSL Decryption, PCNSE Study Guide (page 60)

For an application that is currently identified as unknown-tcp and has sessions that often remain idle for long periods, creating a custom application and using an application override rule is the most time-efficient solution.

C. The process involves:

Creating a custom application in the Palo Alto Networks firewall and configuring it with specific timeouts to accommodate the application's idle session behavior. This step ensures that the firewall does not prematurely close the application's sessions due to inactivity.

Next, creating an application override rule that references the custom application. This rule directs the firewall to identify traffic matching the rule criteria (such as source, destination, and port information) as the custom application, bypassing the App-ID engine's regular identification process.

This approach allows for the quick implementation of a solution that ensures the application is properly identified in traffic logs without undergoing threat scanning, meeting the requirements for both identification and reporting.

WildFire logs showing a "malicious" verdict with an "allow" action indicate that the initial traffic wasn’t blocked in real-time, likely because the Antivirus profile isn’t configured to act immediately on WildFire verdicts. By default, WildFire submits files for analysis, and signatures may take up to 24 hours to propagate globally unless real-time blocking is enabled. Configuring the Antivirus security profile (Option B) to "block" on malicious WildFire verdicts ensures that threats are blocked within minutes once the verdict is returned (typically 5-15 minutes), leveraging WildFire’s real-time signature updates.

Option A (WildFire analysis profile) defines what files are sent to WildFire but doesn’t control blocking actions. Option C (File Blocking profile) manages file type blocking, not threat verdicts. Option D (file size limits) affects submission eligibility, not blocking behavior. The Antivirus profile is the key to real-time WildFire enforcement, as per Palo Alto Networks documentation.

To address the question about the Device Telemetry feature in PAN-OS and its compliance with privacy and data storage laws, let’s examine the details thoroughly.

Understanding Device Telemetry in PAN-OS

Device Telemetry is a feature in Palo Alto Networks’ PAN-OS that collects data from the firewall to provide insights for:

Product usage trends.

Threat analysis.

Operational optimizations.

Telemetry may include:

Configuration data.

Threat logs.

Performance metrics.

However, specific aspects of this feature require attention to ensure compliance with local privacy laws.

Explanation of Options

A. Telemetry feature is automatically enabled during PAN-OS installation

Why It Requires Action:

Telemetry may be enabled by default when upgrading or installing PAN-OS. Local privacy laws (e.g., GDPR in Europe, CCPA in California) often require explicit user consent before enabling data collection.

Relevant Action:

Administrators must review and disable telemetry if required or configure it to align with local compliance laws.

PAN-OS 11.0 Admin Guide: Telemetry configuration is detailed under the "Device Telemetry" section.

PCNSA Study Guide (Domain 1: Device Management): Covers the importance of managing device settings, including Telemetry.

B. Telemetry data is uploaded into Strata Logging Service

Why It Does Not Require Immediate Action:

Data sent to the Strata Logging Service is anonymized and typically adheres to Palo Alto Networks' privacy guidelines. Administrators can disable Strata Logging uploads if necessary.

Optional Action:

Ensure the data is anonymized or disable the service if the organization does not agree with external data storage.