PCNSA Practice Test 4 — 25 Questions

Question 1

A security engineer is troubleshooting a connectivity issue where internal users cannot reach a public web server hosted on the internet. The firewall is configured with a security policy that allows traffic from the internal zone to the external zone on port 80. The engineer notices that traffic is being dropped. Upon checking the session table, the engineer sees that the session is initiated correctly but the return traffic is not matching the existing session. What is the most likely cause?

Accepted Answer

Asymmetric routing. The session is initiated correctly, but return traffic is not matching the existing session. This is a classic symptom of asymmetric routing, where the forward traffic traverses one firewall and the return traffic takes a different path, bypassing the firewall that holds the session state. Palo Alto Networks firewalls are stateful and require both directions of traffic to pass through the same firewall to maintain session consistency.

Answer

Application override configured for HTTP

Answer

DNS resolution failure

Answer

NAT policy mismatch

Question 2

An organization uses GlobalProtect for remote access. Users report that they cannot connect to the portal. The firewall's GlobalProtect portal configuration is correct, and the firewall has a valid certificate. What is the most likely cause of the issue?

Accepted Answer

The firewall's external interface does not have a security policy rule allowing HTTPS traffic to the portal IP.. The most likely cause is that the firewall's external interface lacks a security policy rule permitting HTTPS (TCP/443) traffic to the GlobalProtect portal IP. Even with correct portal configuration and a valid certificate, the firewall will drop the client's connection attempt if no rule explicitly allows inbound HTTPS traffic to the portal's IP address. This is a common oversight when deploying GlobalProtect remote access.

Answer

The authentication profile is set to RADIUS but the RADIUS server is unreachable.

Answer

The certificate is self-signed and not trusted by the client.

Answer

The GlobalProtect gateway is not configured with a matching tunnel interface.

Question 3

A network administrator is troubleshooting a connectivity issue where users in the 192.168.1.0/24 subnet cannot reach a server at 10.0.0.10. The firewall has a rule that allows traffic from source zone 'Trust' to destination zone 'DMZ' with source address 192.168.1.0/24 and destination address 10.0.0.10. The traffic is matching the rule, but the packets are being dropped. What is the most likely reason?

Accepted Answer

The firewall does not have a route to the 10.0.0.0/24 network.. The traffic matches the security rule, but the firewall drops the packet because it cannot find a route to the destination network 10.0.0.0/24. In Palo Alto Networks firewalls, even if a security rule permits traffic, the firewall must have a valid route in its routing table to forward the packet to the next hop. Without a route, the firewall has no way to deliver the packet to the server at 10.0.0.10, resulting in a drop.

Answer

The security rule is not placed at the top of the rulebase.

Answer

A zone protection profile is blocking the traffic.

Answer

The destination server does not have a route back to the 192.168.1.0/24 subnet.

Question 4

An administrator is configuring a new Palo Alto Networks firewall and wants to ensure that management access to the firewall is secure. Which of the following is a best practice for securing management access?

Accepted Answer

Use a dedicated management interface and restrict access to trusted IP addresses.. Option C is correct because using a dedicated management interface physically separates management traffic from data traffic, reducing the attack surface. Restricting access to trusted IP addresses via an access list ensures that only authorized hosts can reach the management plane, which is a foundational security best practice for any network device, including Palo Alto Networks firewalls.

Answer

Enable the default admin account with a strong password.

Answer

Allow HTTP access to the management interface for ease of use.

Answer

Enable SNMP with read-write community strings for monitoring.

Question 5

Which TWO of the following are valid methods to deploy a Palo Alto Networks firewall in a virtualized environment? (Choose two.)

Accepted Answer

KVM. KVM (Kernel-based Virtual Machine) is a supported hypervisor for Palo Alto Networks firewalls, allowing deployment as a virtual machine (VM) on Linux-based virtualization platforms. Palo Alto Networks provides specific VM images (e.g., KVM-compatible QCOW2 format) for KVM environments, making it a valid method for virtualized deployments.

Answer

Microsoft Hyper-V

Answer

Docker

Answer

Oracle VirtualBox

Question 6

Refer to the exhibit. A firewall has learned three routes for the 10.0.1.0/24 network. Which route will be used for forwarding traffic destined to 10.0.1.1?

Accepted Answer

The route via 10.0.0.2 on ethernet1/3. The firewall selects the route with the lowest administrative distance (AD) for forwarding traffic to 10.0.1.1. In this scenario, the route via 10.0.0.2 on ethernet1/3 has an AD of 10 (typically OSPF), which is lower than the AD of 20 (static route) and 110 (RIP). Therefore, it is the preferred route.

Answer

The route via 10.0.0.3 on ethernet1/4

Answer

The route via 10.0.0.4 on ethernet1/5

Answer

All three routes are used in ECMP

Question 7

Which THREE actions can a Security policy rule perform on traffic?

Accepted Answer

Drop. A Security policy rule in Palo Alto Networks firewalls can explicitly drop traffic, which silently discards the packet without sending any notification to the source. This is a valid action for blocking unwanted traffic while minimizing network overhead and avoiding unnecessary responses.

Answer

Reset

Answer

Block

Question 8

An administrator wants to allow only specific applications (e.g., web-browsing, ssl) from the internal network to the internet. Which object type should be used in the security policy application field?

Accepted Answer

Application object. The correct answer is A, Application object, because in Palo Alto Networks security policies, the application field uses predefined or custom application objects to identify traffic based on the application identity, not just port/protocol. This allows the administrator to permit specific applications like web-browsing (HTTP/HTTPS) and SSL while blocking others, even if they use the same ports. Application objects leverage App-ID technology to inspect traffic beyond Layer 4, ensuring only allowed applications pass.

Answer

Application filter

Answer

Application group

Answer

Service object

Question 9

A firewall administrator is troubleshooting a situation where traffic from the 'Engineering' zone (source zone) to the 'Servers' zone (destination zone) is being allowed, but the desired behavior is to block it. The administrator runs 'show running security-policy' and sees the following rules in order: Rule1: from Engineering to Servers allow; Rule2: from Engineering to Servers deny; Rule3: from any to Servers allow. Which TWO statements are true regarding policy evaluation?

Accepted Answer

The traffic will be allowed because Rule1 matches before Rule2.. Option A is correct because Palo Alto Networks firewalls use first-match policy evaluation: the first rule that matches the traffic's source zone, destination zone, source/destination IP, application, and user determines the action. Since Rule1 (allow) appears before Rule2 (deny), traffic from Engineering to Servers matches Rule1 first and is allowed, regardless of later deny rules.

Answer

To block the traffic, you can set the source zone in Rule2 to 'Negate' Engineering.

Answer

Moving Rule2 to the end of the rulebase will ensure it blocks the traffic.

Answer

The firewall evaluates all rules and applies the most restrictive action (deny).

Question 10

Match each PAN-OS component to its role.

Accepted Answer

Management Plane: Handles device configuration, management access, and logging.. The three PAN-OS planes are Management, Data, and Control. The Management Plane handles configuration and logging, the Data Plane forwards traffic, and the Control Plane manages routing and sessions. Common mistakes include swapping the roles of Management and Data planes.

Answer

Management Plane: Processes and forwards network traffic based on security policies.

Answer

Data Plane: Handles device configuration, management access, and logging.

Question 11

Match each protocol to its default port used by Palo Alto Networks.

Accepted Answer

HTTPS: 443. The correct matches are HTTPS:443, SSH:22, and HTTP:80. Common confusions include swapping ports between HTTPS and SSH or HTTP, as all are used for management access.

Answer

HTTPS: 22

Answer

SSH: 80

Answer

HTTP: 443

Question 12

A firewall administrator is tasked with implementing a policy that allows SSH access from the 'Admin' zone to the 'Core' zone only for specific administrators, and all other SSH attempts should be logged and dropped. The company has a large number of administrators. Which method is most efficient and scalable?

Accepted Answer

Create a rule with source zone 'Admin', destination zone 'Core', application 'ssh', source user set to an LDAP group containing the administrators, action 'allow', and a second rule with same match criteria but action 'drop' and log at end.. Option B is correct because it uses an LDAP group as the source user attribute, which allows dynamic membership management without manual IP updates. The first rule permits SSH for the group, and the second rule logs and drops all other SSH attempts, ensuring only authorized administrators are allowed while unauthorized attempts are recorded for auditing. This approach is scalable for a large number of administrators because it leverages user-based policies rather than IP-based rules.

Answer

Create a single rule with source zone 'Admin', destination zone 'Core', application 'ssh', source user 'any', action 'allow' and enable logging.

Answer

Create a rule with source zone 'Admin', destination zone 'Core', application 'ssh', action 'allow', and rely on the firewall's default deny rule for others.

Answer

Create a rule with source zone 'Admin', destination zone 'Core', application 'ssh', source address list of all administrators' IPs, action 'allow', and a catch-all drop rule.

Question 13

A security administrator is analyzing the rulebase for best practices. Which TWO of the following are recommended practices for security policy management? (Choose two.)

Accepted Answer

Place more specific rules above more general rules.. The recommended best practices are placing more specific rules above more general rules (B) and using security profile groups to consistently apply security profiles (E). Placing specific rules first ensures that the most granular match criteria are evaluated before broader rules, which aligns with the firewall's first-match logic. Security profile groups allow you to define a set of profiles (antivirus, anti-spyware, vulnerability protection, etc.) and apply them consistently across multiple rules, simplifying management and reducing misconfigurations. Option A is incorrect because disabling logging for frequently matched rules would hinder visibility into allowed traffic and potentially mask malicious activity. Option C is incorrect because creating a rule for each application leads to excessive rules, making management complex and increasing the chance of errors; Palo Alto Networks recommends grouping applications with similar characteristics. Option D is incorrect because the 'intrazone-default' rule is a built-in rule that by default allows all intrazone traffic; it should not be modified to allow traffic, as it is intended for logging or dropping unwanted intrazone traffic according to best practices.

Answer

Disable logging for frequently matched rules to improve performance.

Answer

Create a single rule for each application to simplify management.

Answer

Use the 'intrazone-default' rule to allow all traffic in the same zone.

Question 14

An administrator wants to ensure that traffic from the corporate network to the internet is inspected by the firewall's threat prevention features. Which TWO of the following are required to achieve this? (Choose two.)

Accepted Answer

Create a security rule that allows the traffic and includes a security profile group with threat prevention.. Options C and D are correct. To ensure traffic is inspected by threat prevention features, you need a security rule that allows the traffic and includes a security profile group with threat prevention (C). Additionally, the rule's action must be set to 'allow' (D) for the traffic to pass through and be inspected; otherwise, traffic would be blocked. Option A (decryption) is only required for encrypted traffic, but the question does not specify that all traffic is encrypted, so it is not universally required. Option B (NAT) is for address translation, not inspection. Option E (application override) is not necessary for threat prevention.

Answer

Enable decryption to inspect encrypted traffic.

Answer

Configure NAT policies for outbound traffic.

Answer

Use application override to force detection.

Question 15

Refer to the exhibit. The administrator sees that traffic from 10.10.1.12 is being denied by rule2. Which action should the administrator take to allow this traffic while maintaining security?

Accepted Answer

Create a new rule above rule2 that allows the specific traffic with appropriate security profiles.. Option C is correct because creating a new rule above rule2 that specifically allows traffic from 10.10.1.12 with appropriate security profiles will permit the desired traffic without affecting other rules. Rule order matters in Palo Alto firewalls; a rule placed higher in the list is evaluated first. Option A would broaden rule1's source, potentially allowing unintended traffic. Option B would change rule2 to allow, which could permit traffic that should still be denied. Option D would move rule2 above rule1, but since rule2 is a deny rule, the traffic would still be denied. Thus, adding a new allow rule above the deny rule is the best approach.

Answer

Add 10.10.1.12 to rule1's source address.

Answer

Change rule2 to allow.

Answer

Move rule2 above rule1.

Question 16

An administrator has configured multiple security rules for a data center. There is a rule that allows SSH from the 'Management' zone to the 'Server' zone. Recently, the administrator added a new rule allowing SSH from a new 'Admin' zone to the 'Server' zone. The Admin rule is placed above the Management rule. Both rules specify the correct zones, application SSH, and action allow. After committing, SSH traffic from the Admin zone is being denied. What is the most likely issue?

Accepted Answer

There is a deny rule placed above the new Admin rule that matches the Admin zone traffic.. The Admin rule is placed above the Management rule and both allow SSH, so traffic should be allowed by the Admin rule. The most likely reason for denial is that a deny rule exists above the Admin rule that matches the Admin zone traffic, thereby blocking SSH before the Admin rule is evaluated. Option A correctly identifies this.

Answer

The Admin rule has a typo in the destination address, causing it to not match the server.

Answer

The Management rule is shadowing the Admin rule due to overlapping conditions.

Answer

The Admin zone is not associated with the correct virtual router.

Question 17

Which THREE are valid methods to test security policy effectiveness before deployment?

Accepted Answer

Check rule hit counts after applying the policy to a small subset of users.. A, D, and E are correct. Rule hit counts after applying the policy to a subset of users (A) provides real-world feedback. Deploying the policy in a lab environment and reviewing traffic logs (D) allows controlled testing. The Policy Tester tool (E) simulates traffic to validate policy behavior. B is wrong because disabling the policy does not test effectiveness; it simply removes enforcement. C is wrong because packet capture is a troubleshooting tool, not a method to test policy effectiveness before deployment.

Answer

Disable the policy and monitor traffic.

Answer

Use packet capture (PCAP) to analyze traffic.

Question 18

Which TWO factors affect the order in which security rules are evaluated?

Accepted Answer

Whether the rule is intra-zone or inter-zone.. Correct: C and D. Security rules are evaluated in a specific order: first, intra-zone rules are evaluated separately from inter-zone rules, and within each zone type, rules are evaluated from top to bottom based on their position in the rulebase. Therefore, both the rule's zone type (intra-zone vs inter-zone) and its position (top-down) affect evaluation order. A is incorrect because the application does not determine evaluation order; it is a match criterion. B is incorrect because rule hit count is a statistic, not a factor in ordering. E is incorrect because the action (allow or deny) does not affect the order of evaluation.

Answer

Application used in the rule.

Answer

Rule hit count.

Answer

Rule action (allow or deny).

Question 19

A network administrator is migrating from a legacy firewall to a new Palo Alto Networks firewall. The current firewall has a large number of ACL rules that allow traffic based on source/destination IP and port. The administrator wants to convert these rules to App-ID based policies on the Palo Alto firewall. What is the recommended best practice to ensure a smooth migration while maintaining security?

Accepted Answer

Create the same port-based rules on the Palo Alto firewall and then gradually enable App-ID in learning mode to see what applications are being used.. The recommended best practice for migrating from legacy firewall rules to App-ID based policies is to first replicate the existing port-based rules on the Palo Alto firewall to ensure no disruption to traffic. Then, enable App-ID in learning mode (or 'log and learn') to observe the actual applications being used. This allows the administrator to identify applications without blocking them. After sufficient data is collected, the administrator can create App-ID based policies. Option A is incorrect because Policy Optimizer is used for optimization after migration, not as the first step. Option B is risky as it leaves no security policies. Option D could cause outages by immediately enforcing App-ID.

Answer

Use the Policy Optimizer feature in Panorama to analyze existing logs and generate App-ID based policy recommendations.

Answer

Deploy the Palo Alto firewall inline with no policies first, and let it learn the traffic patterns automatically for a week.

Answer

Convert all existing rules to App-ID by using the application default ports and immediately enforce application blocking.

Question 20

Refer to the exhibit. A user at 10.1.1.50 is unable to connect to 192.168.1.100 on TCP port 443. The traffic log shows no entries for that source IP. Which security rule is expected to match this traffic?

Accepted Answer

Rule 1 (Allow-Sales). Option D (Rule 1 – Allow-Sales) is correct. The source 10.1.1.50 belongs to the Sales zone, and the destination 192.168.1.100 belongs to the Servers zone. This is interzone traffic. Rule 1 explicitly permits traffic from Sales to Servers on TCP port 443, so it matches this traffic. The traffic log shows no entries because logging is disabled on Rule 1. The user's inability to connect is likely due to a server-side issue (e.g., the server not listening on port 443) or a routing problem, not because the firewall is dropping the traffic.

Answer

Interzone-default

Answer

Intrazone-default

Answer

Rule 2 (Allow-HR)