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.
An engineer is troubleshooting a scenario where traffic from a specific source IP is not being logged although the security policy log setting is set to 'log at session end'. Which three conditions could prevent logging for that traffic? (Choose three.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The traffic is denied by a rule that has logging disabled.
The correct answers are B, C, and D because a deny rule with logging disabled, log rate exceeded, or session reset can all prevent session-end logging.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 traffic is denied by a rule that has logging disabled.
Why this is correct
If the denying rule has no logging configured, no log is generated.
Related concept
Static NAT maps one inside address to one outside address.
✗
The source IP is in a global log filtering exclusion.
Why it's wrong here
Palo Alto firewalls do not have a global IP-based log exclusion feature.
✓
The session is terminated before session end (e.g., reset).
Why this is correct
If the session ends prematurely, the session-end log may not be written.
Related concept
Static NAT maps one inside address to one outside address.
✗
The traffic matches a rule with 'log at session start' only.
Why it's wrong here
Log at session start would still generate a log at start, not missing completely.
✓
The firewall is exceeding its log rate capacity.
Why this is correct
When log rate is exceeded, logs may be dropped.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSE NAT questions on configuration and troubleshooting.
Troubleshoot — This question tests Troubleshoot — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The traffic is denied by a rule that has logging disabled. — The correct answers are B, C, and D because a deny rule with logging disabled, log rate exceeded, or session reset can all prevent session-end logging.
What should I do if I get this PCNSE question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSE NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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