Quick Answer
The Traffic log is the correct choice because it records every session traversing the firewall, including the specific security rule that matched and the action taken, such as allow, deny, or drop. When investigating which log shows matching rule for blocked traffic to a critical server, the Traffic log provides the per-session rule ID and the exact action applied, unlike the System, Threat, or Config logs which lack this granular session-level detail. On the Palo Alto Networks Certified Network Security Administrator PCNSA exam, this question tests your ability to differentiate log types under troubleshooting scenarios—a common trap is confusing the Threat log (which focuses on signatures and vulnerabilities) with the Traffic log’s rule-matching purpose. A reliable memory tip: think of the Traffic log as the “who did what” record for every session, where the rule ID is always listed in the “Rule” column.
This PCNSA practice question tests your understanding of palo alto networks platforms and architecture. 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.
A junior administrator is investigating a network issue where traffic to a critical server is being blocked. To see the specific security rule that matched and the action taken, which log should the administrator review?
System log
Why wrong: System logs do not contain security rule match details.
Threat log
Why wrong: Threat logs show detected threats, not rule matches.
Config log
Why wrong: Config logs record configuration changes, not traffic matching.
Traffic log
Traffic logs show the security rule that matched and the action taken.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Traffic log
The Traffic log records every session that traverses the firewall, including the specific security rule that matched and the action taken (allow, deny, drop, etc.). Since the administrator needs to identify which rule blocked the traffic to the critical server, the Traffic log is the correct source. System, Threat, and Config logs do not provide per-session rule matching details.
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 logs do not contain security rule match details.
Threat log
Why it's wrong here
Threat logs show detected threats, not rule matches.
Config log
Why it's wrong here
Config logs record configuration changes, not traffic matching.
Traffic log
Why this is correct
Traffic logs show the security rule that matched and the action taken.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
The trap here is that candidates often confuse the Threat log with the Traffic log, assuming blocked traffic always appears in the Threat log, but the Threat log only records sessions that matched a threat signature, not all denied sessions due to security rules.
Trap categories for this question
Command / output trap
Threat logs show detected threats, not rule matches.
Detailed technical explanation
The Traffic log in PAN-OS contains fields such as 'rule', 'action', 'from-zone', 'to-zone', 'source-ip', 'destination-ip', and 'application', allowing precise identification of which security rule processed a session. When a session is denied, the action field shows 'deny' or 'drop', and the rule field shows the exact rule name. This log is essential for troubleshooting policy misconfigurations, as it reveals whether traffic was blocked by a security rule, an application override, or a DoS protection profile.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
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FAQ
Palo Alto Networks Platforms and Architecture — This question tests Palo Alto Networks Platforms and Architecture — Read the scenario before looking for a memorised answer..
The correct answer is: Traffic log — The Traffic log records every session that traverses the firewall, including the specific security rule that matched and the action taken (allow, deny, drop, etc.). Since the administrator needs to identify which rule blocked the traffic to the critical server, the Traffic log is the correct source. System, Threat, and Config logs do not provide per-session rule matching details.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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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