Quick Answer
The answer is the system log. When you troubleshoot commit failure after upgrade Palo Alto, the system log is the first place to look because it captures real-time commit process details, including validation errors, dependency conflicts, and incompatible settings that arise from the PAN-OS version change. The config log, by contrast, only records what was changed, not why the commit failed, making it a common trap on the PCNSA exam—test-takers often confuse the two logs. This question tests your ability to isolate post-upgrade failures by understanding log purpose, a key skill for the Palo Alto Networks Certified Network Security Administrator exam. A helpful memory tip: think “system for status, config for content”—the system log tells you the commit’s health, while the config log just lists the ingredients.
This PCNSA practice question tests your understanding of device management and services. 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.
An administrator upgrades a firewall from PAN-OS 9.1 to 10.0, but a subsequent commit fails. Which log should the administrator examine first to find the cause of the failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
System log
Why wrong: System log covers general system events, not commit failures.
Config log
Config log contains commit results and configuration errors.
Traffic log
Why wrong: Traffic log shows network traffic flows.
Threat log
Why wrong: Threat log shows security threats detected.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Config log
When a commit fails after an upgrade, the system log records commit failures with specific error codes and messages. The administrator should examine the system log first because it captures the commit process details, including configuration validation errors, dependency issues, or incompatible settings introduced by the PAN-OS version change. The config log records configuration changes but does not provide the real-time commit failure diagnostics needed to identify the root cause.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
System log
Why it's wrong here
System log covers general system events, not commit failures.
Config log
Why this is correct
Config log contains commit results and configuration errors.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Traffic log
Why it's wrong here
Traffic log shows network traffic flows.
Threat log
Why it's wrong here
Threat log shows security threats detected.
Common exam traps
The trap here is that candidates often confuse the config log (which records configuration changes) with the system log (which records operational events like commit failures), leading them to incorrectly select the config log as the first place to look for commit failure causes.
Trap categories for this question
Command / output trap
Traffic log shows network traffic flows.
Detailed technical explanation
During a commit, PAN-OS validates the entire candidate configuration against the running configuration and the new PAN-OS version's schema. If a parameter has been deprecated or its allowed values changed between 9.1 and 10.0, the commit will fail with a specific error message in the system log (e.g., 'Commit failed: invalid value for <parameter>'). The config log only shows what was changed and by whom, not the validation errors that occur during the commit process itself.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Device Management and Services — study guide chapter
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FAQ
Device Management and Services — This question tests Device Management and Services — Read the scenario before looking for a memorised answer..
The correct answer is: Config log — When a commit fails after an upgrade, the system log records commit failures with specific error codes and messages. The administrator should examine the system log first because it captures the commit process details, including configuration validation errors, dependency issues, or incompatible settings introduced by the PAN-OS version change. The config log records configuration changes but does not provide the real-time commit failure diagnostics needed to identify the root cause.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This PCNSA 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 PCNSA exam.
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