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Palo Alto Networks Network Security Analyst Sample Questions (Q17-Q22):

NEW QUESTION # 17
A web application development team needs to deploy a new API gateway that uses WebSocket connections for real-time data exchange.
The current Security Policy has a strict rule blocking all 'unknown' or 'incomplete' applications. When testing the API, the WebSocket connections are being reset. Analysis of the traffic logs shows sessions being terminated with 'application-incomplete'. What is the most appropriate action to allow the WebSocket application while maintaining security posture?

A. Create a custom application for the API gateway that identifies WebSocket traffic, and then create a new Security Policy rule allowing this custom application. Use 'application-default' for service.
B. Disable Application Override for the zone where the API gateway resides.
C. Modify the existing block rule to allow 'any' application for the API gateway's destination IP address.
D. Change the service of the existing block rule from 'application-default' to 'any' to allow all ports.
E. Create a new Security Policy rule above the blocking rule, allowing 'web-browsing' and 'SSI' for the API gateway's destination IP, and set service to 'application- default'.

Answer: A

Explanation:
Option C is the most appropriate. The 'application-incomplete' flag indicates that the firewall couldn't identify the application within its signature database, often happening with custom or obscure protocols or applications like WebSockets that might not be fully recognized by default signatures until the session is fully established. Creating a custom application for the API gateway, specifically identifying its WebSocket behavior, allows the firewall to correctly classify and permit the traffic. Using 'application-default' ensures the firewall applies the correct ports for that custom application. Option A is too broad and insecure. Option B is insufficient as 'web-browsing' and 'SSI' might not fully encompass WebSocket's unique characteristics. Option D is incorrect as Application Override would allow you to force an application, not necessarily resolve 'application- incomplete' for a new, unknown one. Option E is insecure as it opens up all ports.

NEW QUESTION # 18
A financial institution's online banking portal is hosted behind a Palo Alto Networks firewall. They've recently observed an advanced persistent DoS attack that periodically shifts its attack vector between SYN floods, UDP floods targeting high-numbered ports, and HTTP GET floods, often occurring simultaneously. The security team needs a dynamic and comprehensive DoS strategy that can adapt to these changing attack types without manual intervention. Which of the following approaches, leveraging DoS protection profiles and policies, would provide the most robust defense?

A. Develop a comprehensive 'DoS Protection Policy' with multiple 'target' rules. Each rule should be specific to an attack type (e.g., one for SYN, one for UDP, one for HTTP), referencing distinct DoS protection profiles tailored with appropriate thresholds and 'Action: Protect' or 'Action: Syn-Cookie'.
B. Utilize a combination of 'DoS Protection Policy' with 'group-by: source-ip' for general flood protection, coupled with 'Application-based DoS Protection' for specific critical banking applications, enabling 'Syn-Cookie' for TCP floods and 'Random Early Drop' for HTTP floods.
C. Implement a 'Zone Protection' profile for the DMZ zone, enabling all flood protection types (SYN, UDP, HTTP) with 'Per-Packet Rate' and 'Per-Session Rate' thresholds, and configure 'Action: Protect' for all.
D. Configure a 'DoS Protection Policy' with a single 'target' rule for the online banking servers. Within this rule, enable 'packet-based-attack-protection' for TCP and UDP floods, and 'session-based-attack-protection' for HTTP, setting 'activation-rate' and 'alarm-rate' thresholds appropriately for each, and using 'Action: Protect' with a 'group-by: source-ip'.
E. Create separate DoS Protection Profiles for SYN, UDP, and HTTP floods, each with aggressive 'action: block' thresholds, and apply all profiles to a single security rule. This ensures immediate blocking of any detected flood.

Answer: D

Explanation:
The challenge is a dynamic, multi-vector DoS attack. A single, comprehensive 'DoS Protection Policy' with a 'target' rule provides the most robust and adaptive defense. Within this single rule, you can enable and fine-tune multiple types of DoS protection (packet-based for TCP/UDP, session-based for HTTP) with their specific thresholds and actions ('protect' or 'syn-cookie'). The 'group-by: source-ip' ensures that the firewall can identify and mitigate attacks from individual attacking sources. Option A is too aggressive and lacks the granularity needed for different attack types, potentially causing false positives. Option B (Zone Protection) is too broad and lacks the target-specific focus. Option C suggests multiple target rules, which is possible, but a single rule encompassing all relevant protections for the target is often more efficient for management and ensures all protections are applied concurrently. Option E's mention of 'Application-based DoS Protection' is not a standard standalone feature in the same context as DoS Protection Profiles/Policies for flood mitigation and 'Random Early Drop' for HTTP floods is not the primary mechanism.

NEW QUESTION # 19
A network administrator is designing an SD-WAN profile for a branch office that requires strict QOS for VoIP traffic and dynamic path selection based on real-time link quality. The branch has two ISP links: one MPLS and one Internet broadband. The administrator wants VoIP to always prefer MPLS if its jitter is below 10ms, otherwise failover to broadband. For general web traffic, a balanced distribution across both links is desired. Which of the following SD-WAN profile configurations, when combined, would best achieve this, assuming a basic Path Monitoring profile is already defined?

A. Implement an SD-WAN profile with a 'Performance-Based' policy for VoIP, specifying a 'Jitter' SLAof 1 Oms for MPLS. For web traffic, use a 'Load Balancing' policy with 'Session Distribution' across available links.
B. Configure an SD-WAN policy rule with 'Application: VoIP', a 'Path Quality' profile preferring MPLS with a Jitter threshold, and a 'Dynamic Path Monitoring' profile to constantly assess link health. For web traffic, use 'Session Distribution' with an 'Equal Cost Multi-Path' (ECMP) routing.
C. Create a custom application for VoIP, assign it a 'High' priority in the QOS profile, and use a 'Best Quality' path selection profile for the VoIP application, prioritizing MPLS. Configure a 'Session Distribution' method for web traffic.
D. Define a service route for VoIP over MPLS, and another for broadband. Apply a health-check monitor to the MPLS link for VoIP traffic with a jitter threshold. For web traffic, configure policy-based forwarding to distribute sessions.
E. Define a 'VoIP' application group, create an SD-WAN policy rule with VoIP' as the application, set 'Link Quality' as the Path Selection metric with a 'Jitter' threshold of 1 Oms for MPLS, and a 'Weighted Round Robin' load balancing for other traffic.

Answer: A

Explanation:
Option C correctly identifies the key components for managing VoIP and general web traffic. 'Performance-Based' policies in SD-WAN profiles are designed to enforce SLAs based on metrics like jitter, loss, and latency, directly addressing the VoIP requirement. Specifying a Jitter SLA of 10ms for MPLS ensures failover if the condition is not met. 'Load Balancing' with 'Session Distribution' is the appropriate method for distributing general web traffic across links. Option A's 'Weighted Round Robin' is less dynamic than session distribution for general traffic. Option B's 'Best Quality' path selection is conceptually similar but 'Performance-Based' is the direct Palo Alto Networks terminology for SLA enforcement. Option D's 'Path Quality' profile is correct but 'Dynamic Path Monitoring' is a prerequisite, not a primary configuration for this scenario. Option E describes routing, not directly an SD-WAN profile feature for dynamic path selection and load balancing.

NEW QUESTION # 20
An advanced persistent threat (APT) detection appliance is deployed as an out-of-band device. To ensure all outbound command-and- control (C2) traffic detected by the firewall's Threat Prevention is diverted for deep inspection by this appliance, a PBF rule is contemplated. The appliance's inspection interface is on ethernet1/6 (network 10.0.0.0/30, gateway 10.0.0.1, appliance IP 10.0.0.2). If the C2 traffic is confirmed (e.g., App-ID 'command-and-control', category 'malware'), it must be forwarded to the appliance, bypassing regular security policies for inspection. After inspection, the appliance will either block or forward the traffic back to the firewall for normal internet egress. Which PBF configuration is suitable for the initial redirection to the appliance, assuming the firewall already identifies C2 traffic correctly, and what's the most critical PBF action for this scenario?

A. Implement a Virtual Wire deployment between the internal network and the internet, with the APT appliance inline within the Virtual Wire, and apply security policies to that Virtual Wire.
B. Create a PBF rule: Source Zone: Internal, Destination Zone: Untrust, Application: command-and-control, Action: Forward, Egress Interface: ethernet1/6, Next Hop: 10.0.0.2. Crucially, ensure this PBF rule is evaluated before any Security Policy rules that might deny the C2 traffic, and a Security Policy rule must still exist to allow the initial C2 traffic to be identified by App-I
C. Create a PBF rule: Source Zone: Internal, Destination Zone: Untrust, Threat Category: malware, Action: Forward, Egress Interface: ethernet1/6, Next Hop: 10.0.0.2. This rule should be configured with a 'Monitor Link Group' for ethernet1/6.
D. Create a PBF rule: Source Zone: Internal, Destination Zone: Untrust, Application: command-and-control, Action: Forward, Egress Interface: ethernet1/6, Next Hop: 10.0.0.2. This rule must be placed above all other outbound PBF rules.
E. PBF cannot be used to redirect traffic based on Threat Categories or dynamic App-ID matches for unknown C2. This requires inline deployment or SPAN ports to the appliance.

Answer: B

Explanation:
This is a challenging question that tests the interaction between PBF, App-ID, and Security Policy evaluation order. 1. PBF Evaluation Order: PBF rules are evaluated before Security Policy rules. This is crucial. If a Security Policy rule denies the C2 traffic before PBF has a chance to match it based on 'Application: command-and-control', the traffic will be dropped and never reach the PBF rule. 2. App-Ld Dependency: For a PBF rule to match on 'Application: command-and-control', the firewall must first identify the application. App-ID requires inspecting the traffic. If the traffic is denied by a Security Policy rule early in the process, App-ID will not have a chance to identify it. 3. The Solution (Option D): Therefore, the correct approach is to have a Security Policy rule that allows the initial C2 traffic to pass through the initial stages of the firewall (so App-ID can inspect it). Once App-ID identifies it as 'command-and-control', the PBF rule (which is evaluated before the Security Policy's final allow/deny decision for the session) can then match it and redirect it to the APT appliance. The PBF rule should be ordered to match the specific C2 traffic first among other PBF rules. Let's review other options: Option A: Correct PBF rule definition, but lacks the critical dependency on Security Policy and App-ID. Option B: PBF rules do not match on 'Threat Category' directly. Threat Categories are outcomes of security profiles applied after the session is established and allowed by a Security Policy. PBF uses match criteria like App-ID, Service, Zone, Address, etc. Option C: Incorrect. PBF can redirect based on App-ID. This implies a misunderstanding of PBF capabilities. Option E: Describes an inline deployment for the APT appliance, which is different from the out-of-band PBF redirection scenario described in the question.

NEW QUESTION # 21
Consider a scenario where a Palo Alto Networks firewall is used to secure access to a critical internal web application that uses a custom header for authentication, e.g., 'X-Auth-Token: [TOKEN VALUE]'. To enhance security, the organization wants to implement a custom vulnerability signature that detects attempts to bypass this authentication by submitting requests with a missing or malformed 'X-Auth- Token' header. Which of the following PCRE (Perl Compatible Regular Expressions) patterns for a custom vulnerability signature would effectively detect both a completely missing 'X-Auth-Token' header and an 'X-Auth-Token' header that is present but followed by an empty string or only whitespace, specifically when targeting HTTP POST requests to '/api/vl/secure_resource'? Assume the signature 'Location' is 'http-post-request-headers' and 'Scope' is 'transaction'.

Answer: E

Explanation:
This question tests PCRE knowledge within the context of Palo Alto Networks custom signatures. We need to detect two conditions: missing header OR empty/whitespace header. Let's break down the required regex components: 1. Missing 'X-Auth-Token' header: This requires a negative lookahead to assert that the string does NOT contain 'X-Auth-Token:". The pattern 'A(?!. X-Auth-Token:). $ means 'from the beginning of the string, assert that nowhere after that (. ) is the string 'X-Auth-Token:' found, then match the entire string (. $ y. 2. 'X-Auth-Token' header with empty or whitespace value: This requires matching 'X-Auth-Token:' followed by zero or more whitespace characters until the end of the line (or header value). The pattern $ achieves this. Combining these with an OR CIS) operator: 'A(?!. X-Auth-Token:). $ (for missing header) $ (for empty/whitespace header) So, the combined pattern should be 'A(?!. X-Auth-Token:). $1X-Auth- Token:s $. Option E matches this exactly. The order of the OR conditions generally doesn't matter for correctness in this case. Let's look at why others are incorrect: A: 'A(?!. X-Auth-Token:. ). $ is slightly redundant with the second The first part is A(?!. X-Auth-Token:). $ which is correct for missing. The second part $ would only match if 'X-Auth-Token:' is at the very beginning of the string, which might not be the case if other headers precede it within the same 'http-post-request-headers' location inspection context. However, often the 'Location' context implies matching within the specific header block. Let's re-evaluate. B: - This only checks for 'X-Auth-Token:' at the very beginning of the entire header block , which is unlikely for a specific header. - The '$' here would match the end of the line , which is what we want for a header value, but the first part is flawed. C: $ - This is a more complex negative lookahead, but its application needs to be careful. "AX-Auth-Token: $ - This uses which matches any character, not just whitespace. Is more precise for whitespace. D: 'A(?!. X-Auth-Token:). $ for missing is correct. $ for empty/whitespace is correct. This is effectively the same as E. There might be a subtle difference in how the signature engine interprets them, but semantically they are identical for this purpose. However, in Palo Alto Networks regex, should be used with caution as it can consume the entire buffer. But for the purpose of a missing header check, it's appropriate. The common idiom for 'does not contain X' is 'A(?!. X). $. Given the options, E and D are effectively identical and correct for the problem statement. When faced with multiple identical correct options, it's usually a trick or a poorly designed question. However, choosing one that precisely matches the commonly accepted PCRE patterns is best. Let's assume the question expects the most idiomatic pattern. Let's re-examine option D and E. They are indeed identical. Let's pick one. Typically, the negative lookahead followed by the positive match is the preferred structure. So E is X-Auth-Token:). $ which puts the 'empty/whitespace' check first. D is 'A(?!. X-Auth-Token:). $1X-Auth-Token:s $ which puts the 'missing' check first. Both are logically equivalent. If there's a performance implication, it's usually negligible for simple regexes. I will stick with E as the provided solution in an earlier assessment.

NEW QUESTION # 22
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Palo Alto Networks Network Security Analyst Sample Questions (Q17-Q22):

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