PCNSE Deploy and Configure Firewalls Practice Question
This PCNSE practice question tests your understanding of deploy and configure firewalls. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company has a pair of Palo Alto Networks firewalls in active/passive HA. The active firewall manages all traffic. Recently, the network team reconfigured the virtual router by adding a new static route to a remote subnet via a next-hop IP on the same interface. After committing, they noticed that the passive firewall's management IP became unreachable. The active firewall continues to pass traffic normally. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The passive firewall has lost its management route
The new static route added in the virtual router likely overwrote the default route or specifically the management subnet route, making the management IP unreachable on the passive firewall.
B
The HA link is down
Why wrong: If the HA link were down, the passive firewall would still have its own management route; the issue is specifically with routing.
C
The static route is causing a routing loop
Why wrong: A routing loop would affect traffic on both firewalls, not just the passive management IP.
D
The virtual router configuration is not synchronized to the passive peer
Why wrong: Configuration sync is automatic in HA; the passive firewall received the same configuration, causing the route conflict.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The passive firewall has lost its management route
In an active/passive HA pair, the passive firewall synchronizes its configuration from the active firewall, including virtual router settings. However, management IP reachability depends on the management network's routing table, which is separate from the dataplane virtual router. Adding a static route to the virtual router does not automatically add a corresponding management route. The passive firewall's management IP became unreachable because it lost its default gateway or specific management route, likely due to a misconfiguration or failure to synchronize the management plane's routing information, which is not part of the HA config sync.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The passive firewall has lost its management route
Why this is correct
The new static route added in the virtual router likely overwrote the default route or specifically the management subnet route, making the management IP unreachable on the passive firewall.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The HA link is down
Why it's wrong here
If the HA link were down, the passive firewall would still have its own management route; the issue is specifically with routing.
✗
The static route is causing a routing loop
Why it's wrong here
A routing loop would affect traffic on both firewalls, not just the passive management IP.
✗
The virtual router configuration is not synchronized to the passive peer
Why it's wrong here
Configuration sync is automatic in HA; the passive firewall received the same configuration, causing the route conflict.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume all routing configurations, including management routes, are synchronized in HA, but Palo Alto Networks separates management plane routing from dataplane virtual routers, and only the dataplane config is synced.
Detailed technical explanation
How to think about this question
Palo Alto Networks firewalls maintain separate routing tables for the management plane (in-band management) and the dataplane (virtual routers). The management interface uses its own default gateway or static routes, which are not automatically replicated from the virtual router configuration. In active/passive HA, only the dataplane configuration (including virtual routers) is synchronized; management plane settings like management IP routes must be configured independently on each peer. A common real-world scenario is when an administrator adds a static route to a virtual router for traffic forwarding but forgets to ensure the passive firewall's management interface has a route back to the management network, causing loss of reachability after failover or reboot.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A network engineer segments a warehouse floor into three subnets: 20 scanners, 5 printers, and 2 management hosts. Picking the wrong mask wastes addresses or leaves too few usable hosts. Exam questions test whether you can apply CIDR notation, calculate block size, and identify the correct usable-host range for a given prefix.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deploy and Configure Firewalls — This question tests Deploy and Configure Firewalls — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The passive firewall has lost its management route — In an active/passive HA pair, the passive firewall synchronizes its configuration from the active firewall, including virtual router settings. However, management IP reachability depends on the management network's routing table, which is separate from the dataplane virtual router. Adding a static route to the virtual router does not automatically add a corresponding management route. The passive firewall's management IP became unreachable because it lost its default gateway or specific management route, likely due to a misconfiguration or failure to synchronize the management plane's routing information, which is not part of the HA config sync.
What should I do if I get this PCNSE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This PCNSE practice question is part of Courseiva's free Palo Alto Networks certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PCNSE exam.
Question Discussion
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