The answer is dataplane exhaustion. This is the correct choice because the exhibit shows dataplane (DP) utilization at 100%, meaning the firewall’s packet forwarding and session setup engine is completely saturated, which directly causes session drops and performance issues. On the Palo Alto Networks PCNSA exam, this scenario tests your ability to distinguish dataplane bottlenecks from control plane or management plane problems—a common trap is blaming high CPU on the management plane, but session drops always point to the dataplane. Remember that the dataplane handles all traffic flow, so when it is exhausted, new sessions cannot be established and existing ones are dropped, even if other resources appear healthy. For a quick memory tip, think “DP = Drop Point” when utilization hits 100%.
PCNSA Device Management and Services Practice Question
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.
Exhibit
Refer to the exhibit.
admin@PA-500> show system info | match uptime
System time: Fri Aug 23 14:22:10 2024
Uptime: 0 days, 2:15:33
admin@PA-500> show system resources
CPU: 45% Memory: 78%
admin@PA-500> show session info
Total active sessions: 85000
Max sessions: 100000
admin@PA-500> show running resource-monitor
Resource: dataplane
CPU: 89% Memory: 92%
Refer to the exhibit. The firewall is experiencing performance issues and dropping sessions. Based on the exhibit, what is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Refer to the exhibit.
admin@PA-500> show system info | match uptime
System time: Fri Aug 23 14:22:10 2024
Uptime: 0 days, 2:15:33
admin@PA-500> show system resources
CPU: 45% Memory: 78%
admin@PA-500> show session info
Total active sessions: 85000
Max sessions: 100000
admin@PA-500> show running resource-monitor
Resource: dataplane
CPU: 89% Memory: 92%
A
Dataplane resources are exhausted
Dataplane CPU at 89% and memory at 92% indicate the dataplane is overloaded, causing drops.
B
The firewall has been recently rebooted
Why wrong: Uptime is 2 hours, but that does not explain drops.
C
System CPU is too high
Why wrong: System CPU is 45%, which is acceptable.
D
The session limit is being reached
Why wrong: Active sessions are 85000 out of 100000, below the limit.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Dataplane resources are exhausted
The exhibit shows that the dataplane (DP) utilization is at 100%, which directly indicates that the dataplane resources are exhausted. When the dataplane is fully utilized, the firewall cannot process new sessions or maintain existing ones, leading to session drops and performance issues. This is the most likely cause because the dataplane handles packet forwarding and session setup, and its exhaustion is a common bottleneck in high-throughput environments.
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.
✓
Dataplane resources are exhausted
Why this is correct
Dataplane CPU at 89% and memory at 92% indicate the dataplane is overloaded, causing drops.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The firewall has been recently rebooted
Why it's wrong here
Uptime is 2 hours, but that does not explain drops.
✗
System CPU is too high
Why it's wrong here
System CPU is 45%, which is acceptable.
✗
The session limit is being reached
Why it's wrong here
Active sessions are 85000 out of 100000, below the limit.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Palo Alto Networks often tests the distinction between management plane (system CPU) and dataplane resources, so the trap here is that candidates confuse high system CPU with dataplane exhaustion, not realizing that session drops are almost always a dataplane issue, not a management plane one.
Detailed technical explanation
How to think about this question
In Palo Alto Networks firewalls, the dataplane is a dedicated processing core (or set of cores) that handles all packet forwarding, session lookup, and security policy enforcement independently from the management plane. When dataplane utilization hits 100%, the firewall enters a state of 'dataplane congestion' where it may start to randomly drop packets or sessions to protect the control plane, as per the internal scheduling and queuing mechanisms. This is often observed in real-world scenarios with high traffic volumes, such as during DDoS attacks or when the firewall is undersized for the traffic load, and can be diagnosed using the 'show running resource-monitor' or 'show system resources' CLI commands to confirm dataplane CPU or memory exhaustion.
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 PCNSA 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.
Device Management and Services — This question tests Device Management and Services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Dataplane resources are exhausted — The exhibit shows that the dataplane (DP) utilization is at 100%, which directly indicates that the dataplane resources are exhausted. When the dataplane is fully utilized, the firewall cannot process new sessions or maintain existing ones, leading to session drops and performance issues. This is the most likely cause because the dataplane handles packet forwarding and session setup, and its exhaustion is a common bottleneck in high-throughput environments.
What should I do if I get this PCNSA 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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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