- A
Disable HA1 link monitoring and rely solely on path monitoring.
Why wrong: Path monitoring does not replace HA keepalives; it monitors data path, not the heartbeat link.
- B
Change the HA mode to active/active to balance traffic and reduce load on the active unit.
Why wrong: Changing HA mode does not solve the keepalive sensitivity issue and may introduce other complexities.
- C
Enable HA2 and configure it as a second heartbeat link for redundancy.
Why wrong: Adding HA2 provides link redundancy but does not adjust the keepalive timer sensitivity to packet loss.
- D
Increase the HA timer (keepalive interval) and increase the number of missed keepalives allowed.
This makes the HA detection less sensitive to sporadic packet loss while still recognizing persistent failure.
Adjusting HA Keepalive Timers to Reduce False Failovers
This PCNSE practice question tests your understanding of managing troubleshooting and high availability. 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 company operates a pair of PA-3220 firewalls in an active/passive HA configuration. The passive firewall is experiencing intermittent HA keepalive failures, causing unnecessary failovers every few minutes. The network engineer checks the HA1 interface statistics and notices packet loss on the dedicated HA1 link. The engineer suspects a physical layer issue. However, the engineer also wants to reduce the sensitivity of the HA keepalive mechanism to tolerate occasional packet loss without triggering a failover. The firewalls are currently using default HA keepalive settings. What should the engineer do to reduce the frequency of false failovers without compromising the ability to detect a true failure?
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
Increase the HA timer (keepalive interval) and increase the number of missed keepalives allowed.
Option D is correct because increasing the HA keepalive interval and the number of missed keepalives allowed makes the passive firewall less sensitive to transient packet loss on the HA1 link. This reduces false failovers while still ensuring that a sustained loss of heartbeats (indicating a true failure) will eventually trigger a failover. The default HA keepalive settings use a 1-second interval with 3 missed keepalives allowed; increasing these values provides tolerance for intermittent loss without disabling failure detection.
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.
- ✗
Disable HA1 link monitoring and rely solely on path monitoring.
Why it's wrong here
Path monitoring does not replace HA keepalives; it monitors data path, not the heartbeat link.
- ✗
Change the HA mode to active/active to balance traffic and reduce load on the active unit.
Why it's wrong here
Changing HA mode does not solve the keepalive sensitivity issue and may introduce other complexities.
- ✗
Enable HA2 and configure it as a second heartbeat link for redundancy.
Why it's wrong here
Adding HA2 provides link redundancy but does not adjust the keepalive timer sensitivity to packet loss.
- ✓
Increase the HA timer (keepalive interval) and increase the number of missed keepalives allowed.
Why this is correct
This makes the HA detection less sensitive to sporadic packet loss while still recognizing persistent failure.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think adding a redundant HA2 link (Option C) solves the problem, but it only provides path redundancy and does not change the keepalive timeout sensitivity, so false failovers can still occur if both links suffer packet loss simultaneously.
Detailed technical explanation
How to think about this question
The HA keepalive mechanism uses UDP packets sent over the dedicated HA1 link at a configurable interval (default 1 second). The passive firewall declares the active unit as failed after missing a configurable number of consecutive keepalives (default 3). By increasing the interval to, for example, 2 seconds and the missed count to 5, the total detection time extends from 3 seconds to 10 seconds, allowing the system to tolerate brief bursts of packet loss without triggering a failover. This approach is preferred over disabling monitoring or adding redundant links because it directly addresses the root cause—sensitivity to loss—while maintaining a deterministic failure detection threshold.
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 PCNSE 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.
Quick reference
OSI Model Reference
| Layer | Name | PDU | Key Protocols / Devices |
|---|---|---|---|
| 7 | Application | Data | HTTP, HTTPS, DNS, SMTP, FTP, SSH |
| 6 | Presentation | Data | TLS / SSL, JPEG, ASCII encoding |
| 5 | Session | Data | NetBIOS, RPC, SIP |
| 4 | Transport | Segment / Datagram | TCP, UDP |
| 3 | Network | Packet | IP, ICMP, OSPF — Routers |
| 2 | Data Link | Frame | Ethernet, Wi-Fi, PPP — Switches, Bridges |
| 1 | Physical | Bits | Cables, NICs, Hubs, Repeaters |
What to study next
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FAQ
Questions learners often ask
What does this PCNSE question test?
Managing Troubleshooting and High Availability — This question tests Managing Troubleshooting and High Availability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Increase the HA timer (keepalive interval) and increase the number of missed keepalives allowed. — Option D is correct because increasing the HA keepalive interval and the number of missed keepalives allowed makes the passive firewall less sensitive to transient packet loss on the HA1 link. This reduces false failovers while still ensuring that a sustained loss of heartbeats (indicating a true failure) will eventually trigger a failover. The default HA keepalive settings use a 1-second interval with 3 missed keepalives allowed; increasing these values provides tolerance for intermittent loss without disabling failure detection.
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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Last reviewed: Jul 4, 2026
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.
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