20+ practice questions focused on Deploy and Configure Firewalls — one of the most tested topics on the Palo Alto Networks Certified Network Security Engineer PCNSE exam. Each question includes a detailed explanation so you learn why the right answer is correct.
Start Deploy and Configure Firewalls PracticeYou are deploying a pair of PA-5250 firewalls in active/passive HA mode for a large enterprise. The firewalls are configured with multiple virtual routers (VRs) to segment traffic: VR-A for internal corporate network, VR-B for DMZ, and VR-C for Internet edge. Each VR is associated with a separate Vsys. The HA pair uses IPsec tunnel monitoring to determine failover. The customer reports that after a recent configuration change, failover does not occur when the primary firewall's Internet-facing interface (ethernet1/1) goes down. You verify that the primary firewall detects the interface failure, but the secondary does not take over. The HA configuration shows: 'monitor failure only' set to 'link-status', 'monitor hold time' 1000ms, 'promotion hold time' 2000ms, and 'monitor failure condition' is 'any'. The IPsec tunnel monitoring is configured for tunnel to a remote site. The path monitoring includes the Internet-facing interface under VR-C. What is the most likely reason for the failover failure?
Explanation: The failover failure occurs because the 'monitor failure only' setting is set to 'link-status', which means only interface monitoring link status changes can trigger failover. The Internet-facing interface is included only in path monitoring, not in interface monitoring, so its link-down event is not detected by interface monitoring. Path monitoring is configured but its failures are ignored for failover due to the 'link-status' setting. IPsec tunnel monitoring is not a supported HA monitoring method on Palo Alto Networks firewalls. Therefore, no valid monitoring method is able to trigger failover when the interface goes down, explaining why the secondary does not take over.
Refer to the exhibit. A user in the 10.0.0.0/8 network is unable to access a web server at 172.16.1.10 which is in the DMZ zone. The firewall's security policy is shown. What is the most likely reason for the failure?
Explanation: The policy's destination zone is 'untrust', but the server is in the 'dmz' zone, so the traffic does not match this policy. Option A is incorrect because the source IP range 10.0.0.0/8 includes the user's IP, so it is not misconfigured. Option C is incorrect because the policy has an 'allow' action, so it is not missing a permit. Option D is incorrect because 'web-browsing' is the correct application for HTTP traffic.
A company is deploying a new firewall in active/passive high availability. The two firewalls are connected directly via the HA1 and HA2 interfaces. After configuration, the passive firewall shows 'HA state: passive' but the active firewall shows 'HA state: non-functional'. What is the most likely cause?
Explanation: In active/passive HA, the HA2 link is used for session synchronization and state propagation. If the HA2 link is down or misconfigured, the active firewall cannot synchronize session state to the passive unit, causing it to report 'non-functional' even though the passive unit sees itself as 'passive'. The HA1 link handles heartbeats and configuration sync, which may still be operational, but without a functional HA2 link, the HA pair cannot maintain proper state synchronization, leading to the active firewall's non-functional state.
A network engineer is configuring a new firewall to replace an existing one. The existing firewall has a policy that allows traffic from the 10.0.0.0/8 subnet to the internet. The new firewall must use the same policy but also log the traffic. The engineer creates a security rule with source zone 'Trust', destination zone 'Untrust', source address 10.0.0.0/8, and action 'allow'. Logging is set at rule end. However, traffic from 10.1.0.0/16 is not being logged. What is the reason?
Explanation: In a Palo Alto Networks firewall, security rules are evaluated from top to bottom, and the first matching rule is applied. If an earlier rule in the policy matches the traffic from 10.1.0.0/16 and allows it, the rule with logging at rule end will never be evaluated, and thus no log entry is generated for that traffic.
A security engineer needs to allow inbound HTTPS traffic from the internet to a web server in the DMZ. The source zone is 'Untrust', destination zone is 'DMZ', and the destination address is the web server's IP. Which security policy action should be used?
Explanation: The correct action is 'allow' because the security engineer needs to permit inbound HTTPS traffic from the Untrust zone to the DMZ web server. In Palo Alto Networks firewalls, the security policy action 'allow' explicitly permits the traffic to pass through the firewall, which is required for legitimate inbound web traffic.
+15 more Deploy and Configure Firewalls questions available
Practice all Deploy and Configure Firewalls questions1. Baseline your knowledge
Start with 10 questions to gauge your current understanding of Deploy and Configure Firewalls. This tells you whether you need a concept refresher or just practice.
2. Review every explanation
For each question — right or wrong — read the full explanation. Understanding why an answer is correct is more valuable than knowing the answer itself.
3. Focus on exam traps
Deploy and Configure Firewalls questions on the PCNSE frequently use trap wording. Look for subtle differences in answers that test your precision, not just general knowledge.
4. Reach 80% consistently
Do repeated sessions until you score 80%+ three times in a row. Then move to mixed-mode practice to test cross-topic recall under realistic conditions.
The exact number varies per candidate. Deploy and Configure Firewalls is tested as part of the Palo Alto Networks Certified Network Security Engineer PCNSE blueprint. Practicing with targeted Deploy and Configure Firewalls questions ensures you can handle any format or difficulty that appears.
Yes. Courseiva provides free PCNSE practice questions across all exam topics and domains. The platform includes topic-based practice, mock exams, missed-question review, bookmarked questions, and readiness tracking — no account required.
Difficulty is subjective, but Deploy and Configure Firewalls is a high-priority exam concept tested in multiple ways — direct recall, scenario analysis, and command-output interpretation. Consistent practice is the best way to build confidence.
Launch a full Deploy and Configure Firewalls practice session with instant scoring and detailed explanations.
Start Deploy and Configure Firewalls Practice →