PCNSE Practice Question: Managing Troubleshooting and High Availability
This PCNSE practice question tests your understanding of managing troubleshooting and high availability. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Exhibit
Refer to the exhibit.
admin@PA-220> show high-availability state
High-Availability State: non-functional
State: non-functional
Reason: configuration mismatch
Local: functional, sync-pending
Peer: running, sync-pending
Active: 10.1.1.1
Passive: 10.1.1.2
Last failure reason: configuration mismatch
Refer to the exhibit. What is the primary cause of the 'non-functional' state?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "primary"
Why it matters: Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
Exhibit
Refer to the exhibit.
admin@PA-220> show high-availability state
High-Availability State: non-functional
State: non-functional
Reason: configuration mismatch
Local: functional, sync-pending
Peer: running, sync-pending
Active: 10.1.1.1
Passive: 10.1.1.2
Last failure reason: configuration mismatch
A
The configuration sync operation has failed
Why wrong: No sync failure is shown; the state is mismatch, not sync failure.
B
One firewall is not running
Why wrong: Both show 'running'.
C
HA1 link failure between 10.1.1.1 and 10.1.1.2
Why wrong: The IPs are reachable as shown by the state.
D
The configuration on the two firewalls is not identical
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The configuration on the two firewalls is not identical
The 'non-functional' state in a Palo Alto Networks HA pair indicates that the configuration synchronization (config sync) has failed because the configurations on the two firewalls are not identical. This is a prerequisite for HA operation; if the configurations differ, the HA pair cannot establish a functional sync state, even if HA1 and HA2 links are up.
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 configuration sync operation has failed
Why it's wrong here
No sync failure is shown; the state is mismatch, not sync failure.
The clue word "primary" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'non-functional' with a link failure or peer down state, but the 'non-functional' state is uniquely tied to configuration synchronization issues, not connectivity or hardware failures.
Trap categories for this question
Command / output trap
No sync failure is shown; the state is mismatch, not sync failure.
Detailed technical explanation
How to think about this question
The 'non-functional' state is specifically defined in PAN-OS HA behavior when the configuration synchronization process detects a mismatch in the running configuration between the two peers. This triggers a 'config sync failure' and places the HA pair into a non-functional state, preventing failover until the configurations are manually reconciled or the 'force config sync' option is used. In real-world scenarios, this often occurs after an admin makes a change on only one firewall without committing to both.
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 practitioner preparing for the PCNSE exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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.
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: The configuration on the two firewalls is not identical — The 'non-functional' state in a Palo Alto Networks HA pair indicates that the configuration synchronization (config sync) has failed because the configurations on the two firewalls are not identical. This is a prerequisite for HA operation; if the configurations differ, the HA pair cannot establish a functional sync state, even if HA1 and HA2 links are up.
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: "primary". Asks for the main purpose or function, not a secondary benefit. Eliminate answers that describe side-effects or partial functions.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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