- A
Enable symmetric return on the virtual wire interfaces.
Why wrong: Symmetric return is not a configurable option in Virtual Wire mode.
- B
Disable session offloading between the HA peers.
Why wrong: Disabling offloading would limit session sharing and likely worsen the problem.
- C
Set the HA timer to asymmetric routing active/passive mode.
Why wrong: No such HA timer option exists; active/active mode is designed to handle asymmetric routing differently.
- D
Configure session distribution to use IP hash instead of round-robin.
IP hash ensures all packets of a session go to the same firewall, preventing asymmetric flow issues.
Question 183 of 516
Solve Asymmetric Routing in Active/Active HA with IP Hash
This PCNSE practice question tests your understanding of manage, monitor and operate. 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 financial institution operates a pair of PA-5260 firewalls in active/active HA using Virtual Wire mode. They are experiencing intermittent asymmetric traffic flows causing session setup failures. The firewall logs show sessions being created with a one-sided flow. Which configuration change is most likely to resolve this issue?
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.
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
✓
Configure session distribution to use IP hash instead of round-robin.
In an active/active HA pair using Virtual Wire mode, asymmetric traffic flows can cause session setup failures because each firewall may see only one direction of the traffic. Configuring session distribution to use IP hash (e.g., based on source and destination IP addresses) ensures that all packets belonging to the same flow are consistently forwarded to the same firewall, preventing one-sided sessions. This resolves the issue by guaranteeing session affinity across the HA pair.
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.
- ✗
Enable symmetric return on the virtual wire interfaces.
Why it's wrong here
Symmetric return is not a configurable option in Virtual Wire mode.
- ✗
Disable session offloading between the HA peers.
Why it's wrong here
Disabling offloading would limit session sharing and likely worsen the problem.
- ✗
Set the HA timer to asymmetric routing active/passive mode.
Why it's wrong here
No such HA timer option exists; active/active mode is designed to handle asymmetric routing differently.
- ✓
Configure session distribution to use IP hash instead of round-robin.
Why this is correct
IP hash ensures all packets of a session go to the same firewall, preventing asymmetric flow issues.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'session offloading' with 'session distribution' and assume disabling offloading will fix asymmetric flows, when in fact it breaks session sharing and makes the problem worse.
Detailed technical explanation
How to think about this question
IP hash session distribution uses a hash of the 5-tuple (source IP, destination IP, protocol, source port, destination port) to deterministically assign flows to a specific firewall in the HA cluster. In Virtual Wire mode, the firewall operates as a transparent Layer 2 bridge, so session distribution must be based on Layer 3/4 information to maintain flow consistency. A real-world scenario where this matters is when load balancers or routers send traffic asymmetrically across the HA pair, causing session timeouts or application errors if distribution is not hash-based.
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.
Visual reference
Quick reference
Asymmetric Encryption Algorithm Comparison
| Algorithm | Key Exchange | Signatures | Equivalent Security Key | Notes |
|---|---|---|---|---|
| RSA-3072 | Yes | Yes | 128-bit | Widely deployed; slow for bulk data |
| ECDSA P-256 | No | Yes | 128-bit | Fast signatures; standard TLS certs |
| ECDH / ECDHE | Yes | No | 128-bit | Perfect forward secrecy in TLS 1.3 |
| DH / DHE | Yes | No | 128-bit (3072-bit key) | Replaced by ECDHE in modern TLS |
| Ed25519 | No | Yes | ~128-bit | SSH keys, modern PKI |
What to study next
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FAQ
Questions learners often ask
What does this PCNSE question test?
Manage, Monitor and Operate — This question tests Manage, Monitor and Operate — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure session distribution to use IP hash instead of round-robin. — In an active/active HA pair using Virtual Wire mode, asymmetric traffic flows can cause session setup failures because each firewall may see only one direction of the traffic. Configuring session distribution to use IP hash (e.g., based on source and destination IP addresses) ensures that all packets belonging to the same flow are consistently forwarded to the same firewall, preventing one-sided sessions. This resolves the issue by guaranteeing session affinity across the HA pair.
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: "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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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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