The answer is to review the security rule that matched the session and check the rule order. When a session is dropped by a security rule, the traffic log explicitly identifies the specific rule that denied the traffic, making a direct review of that rule’s source, destination, application, and service configuration the most immediate troubleshooting step. Additionally, because Palo Alto Networks firewalls evaluate rules top-down, a later allow rule may be preempted by an earlier deny rule, so verifying rule order is equally critical to resolve the drop. On the PCNSE exam, this scenario tests your understanding of log analysis and rule hierarchy, often appearing as a two-part answer where candidates must recognize both the rule configuration and its placement. A common trap is to focus only on the rule content while ignoring the order, or to assume a global policy change is needed. Remember the mnemonic: “Check the rule, then check the queue” — first inspect the matched rule’s settings, then confirm no earlier rule is blocking the path.
PCNSE Troubleshoot Practice Question
This PCNSE practice question tests your understanding of troubleshoot. 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.
Which TWO troubleshooting steps should be performed when a user cannot access an internal server through a Palo Alto Networks firewall, and the traffic log shows that the session was dropped by a security rule?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Check the rule order to see if a rule earlier in the policy is also matching
When a session is dropped by a security rule, the traffic log will show the specific rule that denied the traffic. The most direct troubleshooting step is to review that rule's configuration (Option D) to ensure the source, destination, application, and service match the intended policy. Additionally, because Palo Alto Networks firewalls evaluate rules in top-down order, a later rule that would allow the traffic may be preempted by an earlier deny rule (Option B); checking rule order is critical to identify such a conflict.
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.
✗
Use the packet capture tool to capture the traffic
Why it's wrong here
Packet capture is for deeper analysis, not the first step.
✓
Check the rule order to see if a rule earlier in the policy is also matching
Why this is correct
Multiple rules may match; an earlier rule might deny the traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable logging at session end for all rules
Why it's wrong here
Logging is already enabled; the drop is logged.
✓
Review the security rule that matched the session to ensure it is configured correctly
Why this is correct
The rule might have incorrect source, destination, or service.
Related concept
Read the scenario before looking for a memorised answer.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the issue is with the server or network connectivity (Option E) or jump to packet capture (Option A) instead of focusing on the security policy itself, which is the direct cause indicated by the log's 'dropped by security rule' message.
Detailed technical explanation
How to think about this question
Palo Alto Networks firewalls use a first-match rule evaluation model; when a session matches a rule, the firewall applies the action (allow, deny, drop) and stops processing subsequent rules. The traffic log entry includes the 'rule' field that identifies the matching rule, and the 'action' field shows 'deny' or 'drop'. In a real-world scenario, a common misconfiguration is placing a broad deny rule (e.g., deny any any) above a specific allow rule, causing all traffic to be dropped before reaching the intended permit rule.
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 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
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.
Troubleshoot — This question tests Troubleshoot — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Check the rule order to see if a rule earlier in the policy is also matching — When a session is dropped by a security rule, the traffic log will show the specific rule that denied the traffic. The most direct troubleshooting step is to review that rule's configuration (Option D) to ensure the source, destination, application, and service match the intended policy. Additionally, because Palo Alto Networks firewalls evaluate rules in top-down order, a later rule that would allow the traffic may be preempted by an earlier deny rule (Option B); checking rule order is critical to identify such a conflict.
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.
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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