- A
Check the traffic logs for any denial events
Why wrong: While logs can show drops, the intermittent pattern points to tunnel rekey issues, not policy denies.
- B
Check the IPSec tunnel status and IKE/IPSEC SA rekey timers
Intermittent connectivity every few minutes often indicates a mismatch in SA lifetime or rekey failure.
- C
Reboot the firewall to clear any stale sessions
Why wrong: Rebooting is disruptive and rarely resolves an intermittent rekey issue.
- D
Verify the routing table on both firewalls
Why wrong: Routing is likely static; intermittent loss is not typical of a routing problem.
Question 16 of 516
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.
A company is experiencing intermittent connectivity issues between two branch offices connected via an IPSec tunnel. Users report that they can access resources for a few minutes, then lose connectivity, and after a short time it comes back. Which troubleshooting step should be taken first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
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
✓
Check the IPSec tunnel status and IKE/IPSEC SA rekey timers
The intermittent connectivity pattern (works for a few minutes, drops, then recovers) strongly indicates a phase 2 (IPsec SA) rekey failure. When the IPsec SA lifetime expires and the rekey fails, traffic stops until the SA is re-established, causing the described symptoms. Checking the IKE/IPsec SA rekey timers is the first logical step because it directly addresses the most likely root cause without introducing unnecessary changes.
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.
- ✗
Check the traffic logs for any denial events
Why it's wrong here
While logs can show drops, the intermittent pattern points to tunnel rekey issues, not policy denies.
- ✓
Check the IPSec tunnel status and IKE/IPSEC SA rekey timers
Why this is correct
Intermittent connectivity every few minutes often indicates a mismatch in SA lifetime or rekey failure.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Reboot the firewall to clear any stale sessions
Why it's wrong here
Rebooting is disruptive and rarely resolves an intermittent rekey issue.
- ✗
Verify the routing table on both firewalls
Why it's wrong here
Routing is likely static; intermittent loss is not typical of a routing problem.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often jump to routing or security rule checks, but the periodic nature of the outage is a classic symptom of IPsec SA rekey failure, not a routing or policy issue.
Trap categories for this question
Command / output trap
While logs can show drops, the intermittent pattern points to tunnel rekey issues, not policy denies.
Detailed technical explanation
How to think about this question
IPsec SAs have configurable lifetimes (e.g., 28800 seconds for IKE and 3600 seconds for IPsec by default). When the IPsec SA expires, the firewall attempts a rekey using the existing IKE SA. If the rekey fails (e.g., due to mismatched PFS settings, dead peer detection misconfiguration, or NAT traversal issues), the tunnel drops until the IKE SA also expires and a full renegotiation occurs. The 'show vpn ipsec-sa' and 'show vpn ike-sa' commands on Palo Alto firewalls reveal the remaining lifetimes and any rekey failures.
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
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this PCNSE question test?
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 IPSec tunnel status and IKE/IPSEC SA rekey timers — The intermittent connectivity pattern (works for a few minutes, drops, then recovers) strongly indicates a phase 2 (IPsec SA) rekey failure. When the IPsec SA lifetime expires and the rekey fails, traffic stops until the SA is re-established, causing the described symptoms. Checking the IKE/IPsec SA rekey timers is the first logical step because it directly addresses the most likely root cause without introducing unnecessary changes.
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.
Are there clue words in this question I should notice?
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
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