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Palo Alto Networks Network Security Analyst Sample Questions (Q168-Q173):

NEW QUESTION # 168
Consider a highly secure environment where outbound DNS traffic must be rigorously inspected for DNS exfiltration attempts and malicious domain lookups. The security team wants to leverage Palo Alto Networks' DNS Security profiles. They have identified several internal DNS servers (e.g., 10.0.0.10) that are authorized for external lookups, while all other internal hosts should only resolve against these internal servers. Malicious DNS requests should trigger an immediate block and log. How would you configure a DNS Security profile and related objects to achieve this, including handling specific known bad domains and unknown domains effectively?

A. Create a DNS Security profile. Configure 'Domains' to 'block' for 'malware', 'phishing', and 'unknown'. Set 'Sinkhole' to the firewall's management IP Apply this profile to all outbound security policies matching DNS traffic (port 53 UDP/TCP) regardless of source.
B. Create a DNS Security profile with 'Domains' set to 'block' for all threat categories (e.g., malware, phishing, command-and-control, known-bad-domains, unknown)- Enable 'DNS. Sinkhole' and configure a dedicated sinkhole IP Apply this DNS Security profile to all outbound security policies that allow DNS traffic. For the internal DNS servers (10.0.0.10), create an explicit security policy allowing their DNS traffic to external destinations without this DNS Security profile, ensuring it's evaluated first.
C. Create a DNS Security profile with 'Domains' set to 'block' for 'command-and-control', 'malware', and 'phishing'. Configure a custom DNS Sinkhole IP Apply this profile only to security policies where the source is 'any' and destination is 'external-DNS'. Create a separate policy to allow DNS from internal DNS servers to external DNS with no DNS Security profile.
D. Create a DNS Security profile. For 'DNS Query Actions', set 'Domains: Malware' to 'block', 'Domains: Phishing' to 'block'. For 'DNS Tunneling', set 'tunnel-ratio' to 'block'. Configure a custom DNS Sinkhole IP (e.g., 10.0.0.1). Create two security policies: one allowing DNS from internal DNS servers (10.0.0.10) to external with this DNS Security profile, and another blocking DNS from 'any' internal host directly to external DNS.
E. Create a DNS Security profile. Set 'Domains: Malware' and 'Domains: Phishing' to 'block'. Enable 'DNS Tunneling' detection and set the action to 'block'- Configure a DNS Sinkhole IP Apply this DNS Security profile to a security policy rule that permits DNS traffic from internal hosts to the internal DNS servers (10.0.0.10). For traffic from 10.0.0.10 to external, apply a separate DNS Security profile with 'allow' for all categories.

Answer: D

Explanation:
Option C is the most accurate and comprehensive solution for the given requirements- It addresses both the inspection of DNS for malicious activity and the enforcement of internal DNS server usage. By creating two policies, one for allowed internal DNS servers (10.0.0.10) to external, with the DNS Security profile applied for inspection, and another blocking direct external DNS lookups from other internal hosts, the security posture is met The DNS Security profile should focus on blocking C2, malware, and phishing domains, and importantly, detecting DNS tunneling. A custom sinkhole IP is crucial for analysis of blocked traffic. Option D is incorrect as the internal DNS servers should have the DNS Security profile applied when looking up externally Option B is incomplete by not applying DNS Security to the internal DNS server's external lookups. Option A applies the profile too broadly without considering the authorized internal DNS servers- Option E misapplies the DNS security profile to internal-to-internal DNS traffic, which isn't the primary concern for outbound exfiltration.

NEW QUESTION # 169
A Palo Alto Networks Network Security Engineer is investigating an alert on the Incidents and Alerts page indicating 'Port Scan detected'. The alert details point to a source IP of 192.168.1.50 and a destination IP range. In the Log Viewer, filtering for 'threat' logs from 192.168.1.50 reveals numerous 'vulnerability' logs with 'severity: low' for various destination ports. The engineer suspects an advanced, low-and-slow reconnaissance attempt that isn't being fully captured by the default settings. Which of the following advanced configurations or investigative steps would MOST effectively improve detection and incident generation for such sophisticated scanning and potentially identify the true extent of the activity?

A. Configure a 'Correlation Object' on the firewall that triggers a 'critical' severity incident if 'N' low-severity vulnerability logs from the same source IP are observed within 'X' seconds, targeting different ports. This would require specific Custom Reports in the Log Viewer or a SIEM integration.
B. Increase the logging level for all security policies to 'session-start' and 'session-end' to capture more granular traffic details, and then review all session logs for the source IP.
C. Enable 'DDoS Protection' profiles and configure zone-based protection with aggressive thresholds for SYN flood and UDP flood, as port scans often precede these attacks.
D. Adjust the 'Scan Detection' threshold in the Anti-Spyware profile to a lower value and set the action to 'block' and 'generate alert' for port scan events. Also, enable packet capture for the source IP.
E. Create a custom 'Threat Signature' in the Vulnerability Protection profile based on the specific port scan patterns observed in the low-severity logs, assigning it a 'high' severity and 'alert' action. Correlate this with existing Incidents.

Answer: A,D

Explanation:
This is a multiple-response question. Both A and C are highly effective for detecting and escalating sophisticated low-and-slow scans. 'A' directly addresses the 'Port Scan detected' alert. Lowering the 'Scan Detection' threshold in the Anti-Spyware profile makes the firewall more sensitive to port scans, including low-and-slow ones. Setting the action to 'block' provides immediate mitigation, and 'generate alert' ensures an incident is created. Packet capture provides crucial forensic evidence. 'C' addresses the 'low-and-slow' aspect by leveraging correlation. While a direct 'Correlation Object' on the firewall for this specific scenario isn't a native feature for generic log correlation, the concept of building correlation rules based on aggregated low-severity events is a core principle in advanced threat detection (often in a SIEM). It recognizes that multiple low-severity events can indicate a high-severity incident. For a Palo Alto Networks Network Security Analyst, this would primarily involve using a SIEM or custom reporting to achieve this correlation on aggregated log data, or potentially leveraging Autofocus/Cortex XDR for more advanced correlation capabilities if integrated. However, the question asks for advanced configurations or investigative steps, and the conceptual approach of correlating low-severity events is highly relevant and effective for this scenario. Option B might work for very specific, known patterns but is less effective for generalized port scanning where patterns might vary. Option D is for DDoS attacks, not specifically port scanning. Option E increases log volume but doesn't inherently improve detection or correlation of subtle scan patterns.

NEW QUESTION # 170
A critical infrastructure organization is upgrading its SCADA network and has deployed Palo Alto Networks NGFWs to secure the environment. They need to implement an IoT security profile that strictly adheres to the Purdue Model for segmentation and communication. Specifically, they want to:
1. Allow only specific Modbus/TCP function codes (Read Coils, Read Holding Registers) between Zone 3 (Control Servers) and Zone 2 (PLCs).
2. Block all internet access for devices in Zone 2 and Zone 3.
3. Alert on any new, unclassified device attempting to communicate within Zone 2 or Zone 3.
4. Implement signature-based protection against known ICS exploits.
Which of the following configuration steps, in combination, are necessary to achieve these requirements using a Palo Alto Networks IoT Security Profile and related features? (Multiple Response)

A. Configure 'Security Policies' with 'Source Zone: Zone 2/3', 'Destination Zone: Untrust', 'Application: any', 'Service: any', and 'Action: Deny'. Ensure these rules are placed higher than any default permit rules.
B. Utilize 'Device-ID' within the IoT Security Profile to automatically identify and classify devices in Zone 2 and Zone 3. Configure 'IoT Policy Rules' to use 'IoT Device Groups' as source/destination and set 'Action: Alert' for unknown device communication attempts.
C. Configure a 'Vulnerability Protection' profile with a focus on 'Critical' and 'High' severity signatures, especially those related to SCADA/ICS vulnerabilities, and apply it to all relevant security policies.
D. Create an 'IoT Security Profile' for ICS, enabling 'Application Function Filtering' for Modbus/TCP to permit only 'Read Coils' and 'Read Holding Registers'. Apply this profile to an 'IoT Policy Rule' between Zone 3 and Zone 2, with 'Application' set to 'modbus-tcp'.
E. Create a custom 'Anti-Spyware' profile with specific Modbus/TCP signatures and apply it to all security rules for Zone 2 and Zone 3 traffic.

Answer: A,B,C,D

Explanation:
This question requires a comprehensive understanding of Palo Alto Networks' IoT security features.
A: Correct. 'Application Function Filtering' is precisely for granular control over industrial protocols like Modbus/TCP functions.
B: Correct. Explicit deny rules are essential for blocking unwanted internet access, especially for critical infrastructure, and their placement in the rulebase is crucial.
C: Correct. Device-ID and IoT Device Groups are fundamental for dynamic classification and alerting on rogue devices. This fulfills requirement #3.
D: Incorrect. 'Anti-Spyware' is primarily for C2 and malware. 'Vulnerability Protection' (E) is the correct profile for signature-based ICS exploit protection.
E: Correct. 'Vulnerability Protection' profiles are designed for blocking known exploits and vulnerabilities, including those specific to ICS, fulfilling requirement

NEW QUESTION # 171
A network administrator is troubleshooting an intermittent application connectivity issue that only affects a specific subnet, but only when traffic traverses a particular firewall managed by Panoram a. The administrator suspects a recent policy change. How can Panorama's features be leveraged to efficiently diagnose and potentially revert problematic policy changes for this specific firewall, minimizing impact to other devices?

A. Disable all security policies on the problematic firewall to isolate the issue, then re-enable them one by one.
B. Export the full configuration of all firewalls, use a diff tool to compare them, then manually reconfigure the problematic firewall.
C. Use the 'Commit Scope' feature in Panorama to commit only the changes made to the problematic device group and then review the commit history on the device itself.
D. Perform a 'Revert to Last Saved Configuration' directly on the affected firewall, then manually re-apply all necessary changes.
E. Utilize Panorama's 'Configuration History' and 'Load Named Configuration' features to review recent changes, identify the specific commit that introduced the issue, and revert only that firewall's configuration to a previous, known-good state without affecting other devices managed by Panorama.

Answer: E

Explanation:
Option C is the most effective and safe method. Panorama's 'Configuration History' allows administrators to view all past commits, including who made them and what changes were included. The 'Load Named Configuration' feature enables loading a specific historical configuration point for a particular firewall or device group, rather than the entire Panorama configuration. This granular control allows for targeted troubleshooting and reversion without impacting other firewalls. Option A is partially correct but doesn't offer direct reversion of specific historical commits. Option B is risky as it might revert more than intended and lose recent valid changes. Option D is cumbersome and manual. Option E is disruptive and not a targeted diagnostic approach.

NEW QUESTION # 172
A global financial institution is implementing Strata Logging Service for their extensive Palo Alto Networks firewall deployment. They face stringent regulatory requirements for data residency and auditability, necessitating that certain log types (e.g., authentication, sensitive data filtering) remain within specific geographic regions while others (e.g., general traffic, threat) can be stored globally Furthermore, auditors require immutable log records for a minimum of 7 years. How can this complex requirement be met using Strata Logging Service and related Palo Alto Networks capabilities?

A. Strata Logging Service natively supports data residency through geo-fencing options for specific log types. Enable this feature and set retention to 7 years. For immutability, integrate with a WORM (Write Once Read Many) storage solution provided by Palo Alto Networks.
B. Configure all firewalls to send logs to a single global Strata Logging Service instance. Use advanced SLQL queries with 'geo_location' field filters and export relevant logs to regional SIEMs or long-term storage solutions.
C. Use multiple Strata Logging Service instances, each configured for a specific geographic region, and direct firewalls to the appropriate regional instance based on their location. Leverage Strata Logging Service's native data retention policies for the 7-year requirement.
D. This requirement cannot be fully met with Strata Logging Service alone due to its global nature; a hybrid approach with dedicated regional syslog servers and a separate immutable archive is the only viable option.
E. Deploy local Panorama log collectors in each region, forward sensitive logs to them, and then use a global Strata Logging Service for non-sensitive logs. Implement a separate archival solution for 7-year immutability.

Answer: C

Explanation:
Strata Logging Service instances are provisioned in specific geographic regions. To meet strict data residency requirements, an organization would deploy multiple Strata Logging Service instances, one in each required region. Firewalls are then configured to forward their logs to the Strata Logging Service instance located in their respective region (or the region where their data must reside). Strata Logging Service offers configurable data retention policies, allowing for the 7-year retention period directly within the service, which inherently provides immutability for the stored logs as they cannot be altered after ingestion. Option D is incorrect as Strata Logging Service does not offer geo- fencing for specific log types within a single instance, but rather operates on a per-instance regional basis. Option C introduces unnecessary complexity with local Panorama collectors when Strata Logging Service is designed for scalable cloud logging.

NEW QUESTION # 173
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Palo Alto Networks Network Security Analyst Sample Questions (Q168-Q173):

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