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Palo Alto Networks Network Security Analyst Sample Questions (Q55-Q60):

NEW QUESTION # 55
A Palo Alto Networks administrator is troubleshooting a scenario where GlobalProtect VPN users are intermittently failing to authenticate against an external RADIUS server. Packet captures on the firewall show RADIUS requests being sent to the server, but no responses are received. The RADIUS server itself shows no incoming connection attempts from the firewall. The firewall's routing table is confirmed to be correct for reaching the RADIUS server. What advanced troubleshooting step, specific to the firewall's internal processing, should be performed to diagnose this 'black hole' issue?

A. Verifying the NAT policy applied to the GlobalProtect traffic to ensure the source IP of the RADIUS request is routable back to the firewall.
B. Executing the command
C. Using the CLI command
D. Checking the firewall's system logs for any 'dataplane-out-of-memory' or 'resource-limit' errors that might be silently dropping RADIUS outbound packets.
E. Performing a test radius-server authentication from the CLI, ensuring the correct server profile and username are used to isolate authentication failures from network issues.

Answer: C

Explanation:
The key here is 'Packet captures on the firewall show RADIUS requests being sent to the server, but no responses are received. The RADIUS server itself shows no incoming connection attempts from the firewall.' This indicates an issue where the firewall believes it's sending traffic, but the remote end isn't seeing it. While NAT (A) is a possibility, the problem description implies the firewall itself isn't successfully sending the packets out its physical interface as seen by the server, or the packets are malformed or sourced from an unexpected IR Option C, using debug commands to trace the internal RADIUS authentication flow, is the most specific and advanced step to diagnose why the packet, even if 'sent' by the management plane, isn't reaching the wire or is being malformed/dropped internally before leaving the physical interface. This level of debugging can reveal issues like incorrect source interface binding, or internal routing within the firewall that isn't reflected in the external routing table, or issues with the RADIUS client implementation on the firewall itself. The useridd.log would show the actual packet formation and sending process. Options A, B, D, E are good general troubleshooting but don't address the 'black hole' symptom as directly.

NEW QUESTION # 56
A Palo Alto Networks firewall needs to forward all security-related logs (traffic, threat, URL, data, wildfire, auth) to a Splunk instance via syslog. However, a critical requirement dictates that for 'threat' logs specifically, only those with a 'high' or 'critical' severity should be sent to Splunk, while all other selected log types (traffic, URL, data, wildfire, auth) should be sent regardless of severity. How would this granular filtering be achieved within a single Log Forwarding Profile?

A. Create one Log Forwarding Profile. Select all required log types. For 'threat' logs, adjust the minimum forwarding severity to 'high'. All other log types will be forwarded based on their default minimum severity.
B. This level of conditional filtering based on severity for a specific log type while others are unfiltered is not directly supported within a single Log Forwarding Profile in PAN-OS. Two separate profiles would be required.
C. Use two Log Forwarding Profiles. One for threat logs (filtered for high/critical severity), and another for all other security logs (no severity filter). Apply both profiles to the relevant Security Policies, ensuring they forward to the same Splunk syslog server.
D. Create one Log Forwarding Profile. Select all required log types (traffic, threat, URL, data, wildfire, auth). Under the syslog destination, apply a custom filter:
E. Create a single Log Forwarding Profile. Add the Splunk syslog server. For 'Included Log Types', select 'traffic', 'URL', 'data', 'wildfire', 'auth'. For 'threat' logs, add a separate entry under 'Syslog Fields' to specify 'severity' as a filter and set the threshold.

Answer: D

Explanation:
Option B correctly leverages the power of custom log filters in a Log Forwarding Profile. The filter

precisely achieves the requirement: it forwards 'threat' logs only if their severity is 'high' or 'critical', AND it forwards all other log types (those where 'log.type' is NOT 'threat') without any severity restriction. Option A is incorrect because it is possible. Option C is incorrect as the minimum forwarding severity applies globally to all selected log types within that profile, not selectively to one. Option D is a less efficient, but viable, alternative but not the single profile solution asked for. Option E misinterprets 'Syslog Fields' usage, which is for customizing log content, not filtering.

NEW QUESTION # 57
You are deploying a new application in a segmented network behind a Palo Alto Networks firewall. The application consists of a web frontend (10.0.30.10) in the 'Web' zone and a database backend (10.0.40.20) in the 'DB' zone. The web frontend needs to connect to the database. Due to a legacy application requirement, the web frontend is hardcoded to connect to 'db.internal.com', which resolves to 172.16.1.1. You cannot reconfigure the web application. Your task is to use NAT to redirect traffic from 10.0.30.10 destined for 172.16.1.1 to the actual database server at 10.0.40.20. Which of the following NAT policy configurations would correctly achieve this, assuming appropriate security policies exist?

A.
B.
C.
D.
E. This scenario requires GlobalProtect for VPN-based access to the database, not NAT.

Answer: B

Explanation:
The core problem is that the web frontend sends traffic to a 'dummy' IP (172.16.1.1) that needs to be redirected to the actual database IP (10.0.40.20). This is a classic use case for Destination NAT (DNAT). The firewall needs to intercept packets from 10.0.30.10 going to 172.16.1.1 and change their destination to 10.0.40.20.
Let's break down Option A:
- NAT Type: Destination NAT: Correct, as we are changing the destination of the packet.
- Original Packet: This describes what the firewall sees coming in. The source is 10.0.30.10 (from the 'Web' zone), and it's trying to reach 172.16.1.1, with the intent to go to the 'DB' zone. So, Source Zone: Web, Destination Zone: DB, Source Address: 10.0.30.10, Destination Address: 172.16.1.1 are all correct.
- Translated Packet: This describes how the firewall changes the packet. We want the destination to become 10.0.40.20. So, Translated Destination Address: 10.0.40.20 is correct.
Options C and D are less specific ('any' for destination zone or source/destination zone), which might lead to unintended NAT for other traffic.
Option B is a Source NAT, which changes the source IP, not the destination, and is completely incorrect for this scenario. Option E is irrelevant.

NEW QUESTION # 58
A publicly accessible web application is frequently targeted by HTTP GET floods and slow-read attacks. The existing DoS protection profile on the Palo Alto Networks firewall is configured with generic thresholds, leading to false positives and occasional legitimate user disruptions. The security team wants to refine the DoS protection to specifically counter these HTTP-based attacks while minimizing impact on legitimate users. Which of the following combinations of DoS protection profile settings and their application would be most effective?

A. Both B and D.
B. Utilize 'Slow HTTP Protection' with 'Client Header Timeout' and 'Client Read Timeout' set to aggressive values (e.g., 5 seconds), and 'Action: Reset' for non-compliant sessions.
C. Implement 'Session Based Attack Protection' for 'HTTP Flood' with 'Max Concurrent Sessions' and 'Session Rate' thresholds, and use 'Action: Block' for sources exceeding limits.
D. Configure 'HTTP Flood' protection with a 'Per-Request Rate' and 'Per-Source IP Rate' threshold, setting 'Action: Syn-Cookie' to challenge suspicious HTTP requests.
E. Enable 'HTTP Flood' protection with 'Per-Request Rate' and 'Per-Source IP Rate' thresholds, combined with 'Per-URL Rate' for critical URLs, and set 'Action: Drop' for exceeding thresholds.

Answer: A

Explanation:
The scenario describes two distinct HTTP-based attacks: GET floods and slow-read attacks. HTTP GET floods are best mitigated by rate-limiting on a per-request, per-source IP, and potentially per-URL basis, making 'HTTP Flood' protection with 'Per-Request Rate', 'Per-Source IP Rate', and 'Per-URL Rate' (Option B) highly effective. Slow-read attacks, where an attacker slowly consumes the response to tie up server resources, are specifically addressed by 'Slow HTTP Protection' using 'Client Header Timeout' and 'Client Read Timeout' (Option D). Combining both B and D provides comprehensive protection against both types of HTTP attacks mentioned, making E the correct choice.

NEW QUESTION # 59
A Security Architect is designing a Zero Trust architecture using Palo Alto Networks firewalls. A key requirement is to ensure that all administrative access to critical infrastructure (e.g., domain controllers, internal PKI servers) is strictly controlled and logged, with any unauthorized access attempts immediately generating a 'critical' incident and being blocked. Furthermore, successful administrative access should trigger a 'low' severity alert for auditing purposes. The design must accommodate multiple zones and user groups. Which combination of Palo Alto Networks features, specifically utilizing Log Viewer and Incidents/Alerts, would MOST effectively meet these requirements?

A. Create a security policy rule allowing administrative access from specific source zones/groups to destination administrative zones/servers, with 'Application: ssl, ssh, rdp', and an 'Action: allow-log'. Create a separate 'deny' rule below it for the same traffic, and set the 'Action: deny' with an 'alert profile' configured to generate critical alerts for denied connections. Successful connections will be logged, and denied connections will generate critical alerts.
B. Utilize 'Security Groups' and 'Dynamic Address Groups' to enforce micro-segmentation. For administrative access, create a policy allowing specific security groups to specific dynamic address groups. Rely on default logging and alerts, and review logs daily for anomalies.
C. Implement an Authentication Policy to challenge all administrative access attempts. Configure an 'Authentication Profile' with 'Action: allow' for authorized users, and a 'fall-back' action of 'deny' with 'logging enabled'. Leverage 'User-ID' for granular user-based policies. This covers access control but not necessarily distinct alert severities for allowed/denied.
D. Configure 'Policy Based Forwarding' (PBF) to redirect all administrative traffic to a dedicated logging server, then use a SIEM to analyze logs and generate alerts based on custom rules. This offloads alerting from the firewall and Incidents page.
E. Define dedicated security policy rules for administrative access: 1. 'Allow Admin_Access': Source Zone (Admin_Workstations), Source User Group (IT_Admins), Destination Zone (Server_lnfrastructure), Destination Port (22, 3389, 443), Action: Allow, Log at Session End. Attach an 'Alert Profile' to this rule configured to generate 'low' severity alerts for 'session-start'. 2. 'Deny_Unauthorized_Admin_Access': Source Zone (Any), Destination Zone (Server_lnfrastructure), Destination Port (22, 3389, 443), Action: Deny, Log at Session End. Attach an 'Alert Profile' to this rule configured to generate 'critical' severity alerts for 'session-end' (denial). Ensure rule 1 is above rule 2.

Answer: E

Explanation:
Option C is the most effective and granular approach that directly addresses all specified requirements using native Palo Alto Networks features and their interaction with the Log Viewer and Incidents/Alerts page. 1. Strict Control & Logging (Allow): The first rule ('Allow_Admin_Access') explicitly defines who (IT_Admins from Admin_Workstations) can access what (Server_lnfrastructure on admin ports). 'Log at Session End' ensures traffic is recorded. 2. Low Severity Alert for Successful Access: By attaching an 'Alert Profile' to the allow rule, configured for 'low' severity alerts on 'session-start', every successful administrative login attempt generates an auditable, low-severity incident. This is crucial for auditing. 3. Critical Incident for Unauthorized Access (Block): The second, broader rule ('Deny_Unauthorized_Admin_Access') acts as a catch-all for any other administrative access attempts to the critical infrastructure. By setting 'Action: Deny' and attaching an 'Alert Profile' configured for 'critical' severity alerts, any unauthorized attempt is blocked and immediately escalated as a critical incident. The order of rules (specific allow above generic deny) is critical for proper policy enforcement. Option A is less precise in separating the 'allow' and 'deny' logging/alerting requirements for different severities. Option B focuses on authentication, not the distinct logging/alerting for allowed vs. denied based on policy. Option D offloads the primary alerting functionality from the firewall, which is counter-intuitive if the Incidents and Alerts page is a key part of the solution. Option E relies on 'default' logging and manual review, which doesn't meet the 'immediately generating a critical incident' requirement.

NEW QUESTION # 60
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