- A
Path monitoring detects unreachable target
Correct: Path monitoring failure triggers failover.
- B
Heartbeat link failure
Correct: Loss of heartbeat communication triggers failover.
- C
Active firewall CPU usage exceeds 80%
Why wrong: Incorrect: CPU usage is not a default HA failover trigger.
- D
Active firewall's power supply failure
Why wrong: Incorrect: Power supply failure may lead to link loss but is not a direct trigger.
- E
Passive firewall loses connectivity to management network
Why wrong: Incorrect: Only the active firewall's health triggers failover.
Question 353 of 529
PCNSA Device Management and Services Practice Question
This PCNSA practice question tests your understanding of device management and services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 is configuring active/passive HA for two PA-3020 firewalls. Which TWO conditions would trigger a failover? (Choose two.)
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Path monitoring detects unreachable target
Option A is correct because path monitoring actively probes a target IP address (e.g., a next-hop router) using ICMP or ARP. If the target becomes unreachable, the firewall considers the network path failed and triggers a failover to the passive unit, ensuring traffic continuity even if the control plane is healthy.
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.
- ✓
Path monitoring detects unreachable target
Why this is correct
Correct: Path monitoring failure triggers failover.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Heartbeat link failure
Why this is correct
Correct: Loss of heartbeat communication triggers failover.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Active firewall CPU usage exceeds 80%
Why it's wrong here
Incorrect: CPU usage is not a default HA failover trigger.
- ✗
Active firewall's power supply failure
Why it's wrong here
Incorrect: Power supply failure may lead to link loss but is not a direct trigger.
- ✗
Passive firewall loses connectivity to management network
Why it's wrong here
Incorrect: Only the active firewall's health triggers failover.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume high CPU or power supply failures are automatic HA triggers, but Palo Alto's HA failover is based on control-plane and network-path health, not hardware resource utilization or redundant component failures.
Detailed technical explanation
How to think about this question
In active/passive HA, failover triggers are defined by the HA configuration and include heartbeat link failure (loss of keepalive packets on the dedicated HA interface) and path monitoring failure (loss of connectivity to monitored targets). The heartbeat uses UDP port 2925 with a default interval of 1 second and a timeout of 3 seconds. Path monitoring can use ICMP ping or ARP probes, and the failover occurs only after the configured number of retries (default 3) is exceeded. A real-world scenario is when the active firewall's upstream switch fails but the firewall itself remains operational; path monitoring detects the unreachable gateway and triggers failover, while heartbeat alone would not detect this issue.
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 — study guide chapter
Learn the concepts, then practise the questions
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FAQ
Questions learners often ask
What does this PCNSA question test?
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: Path monitoring detects unreachable target — Option A is correct because path monitoring actively probes a target IP address (e.g., a next-hop router) using ICMP or ARP. If the target becomes unreachable, the firewall considers the network path failed and triggers a failover to the passive unit, ensuring traffic continuity even if the control plane is healthy.
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.
What is the key concept behind this question?
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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