- A
Floating static routes were not configured on the passive firewall.
Floating static routes are not synchronized and must be configured on both firewalls.
- B
Static routes were not synchronized.
Why wrong: Static routes are synchronized via HA.
- C
OSPF routes were not synchronized.
Why wrong: OSPF routes are synchronized via HA.
- D
BGP routes were not synchronized.
Why wrong: BGP routes are synchronized via HA.
Question 124 of 516
PCNSE Practice Question: Managing Troubleshooting and High Availability
This PCNSE practice question tests your understanding of managing troubleshooting and high availability. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
An engineer notices that after an HA failover, the new active firewall is not passing traffic. The show running ip route command shows the default route is missing. 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.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Floating static routes were not configured on the passive firewall.
In an active/passive HA pair, static routes are not automatically synchronized from the active to the passive firewall. The passive firewall must have its own static routes configured, often as floating static routes with a higher administrative distance to avoid conflicts during normal operation. When a failover occurs, the new active firewall (formerly passive) lacks the default route because it was never configured or synchronized, causing traffic to fail.
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.
- ✓
Floating static routes were not configured on the passive firewall.
Why this is correct
Floating static routes are not synchronized and must be configured on both firewalls.
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.
- ✗
Static routes were not synchronized.
Why it's wrong here
Static routes are synchronized via HA.
- ✗
OSPF routes were not synchronized.
Why it's wrong here
OSPF routes are synchronized via HA.
- ✗
BGP routes were not synchronized.
Why it's wrong here
BGP routes are synchronized via HA.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume all routes are synchronized in HA, but PAN-OS only synchronizes dynamic routing protocol states and not static route configuration, requiring explicit configuration on both peers.
Detailed technical explanation
How to think about this question
In PAN-OS HA, only session state, configuration (including route tables), and some runtime data are synchronized from active to passive, but static routes must be explicitly configured on both firewalls. Floating static routes use a higher administrative distance (e.g., 200 vs. default 10) so they are only active when the primary route is lost, ensuring seamless failover. Without them, the new active firewall has no default route until manually added or learned via dynamic routing.
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 at a university connects two campus buildings via a fibre link. Both routers run OSPF, but no adjacency forms — even though both routers can ping each other. The engineer finds one router is in area 0 and the other in area 1. OSPF adjacency requires matching area numbers, hello/dead timers, and network type. IP reachability alone is not enough.
Visual reference
What to study next
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FAQ
Questions learners often ask
What does this PCNSE question test?
Managing Troubleshooting and High Availability — This question tests Managing Troubleshooting and High Availability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Floating static routes were not configured on the passive firewall. — In an active/passive HA pair, static routes are not automatically synchronized from the active to the passive firewall. The passive firewall must have its own static routes configured, often as floating static routes with a higher administrative distance to avoid conflicts during normal operation. When a failover occurs, the new active firewall (formerly passive) lacks the default route because it was never configured or synchronized, causing traffic to fail.
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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Last reviewed: Jun 11, 2026
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.
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