- A
Change the HA mode to Active/Passive
Why wrong: Would reduce capacity.
- B
Adjust the session distribution algorithm to match traffic patterns
Proper distribution reduces asymmetric routing.
- C
Increase the HA2 link bandwidth using link aggregation
Why wrong: Link aggregation helps with sync bandwidth, not distribution.
- D
Enable session synchronization for all sessions
Why wrong: Synchronizing all would increase CPU and memory.
Question 274 of 516
Optimizing Session Distribution Algorithm in Active/Active HA
This PCNSE practice question tests your understanding of managing troubleshooting and high availability. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 HA pair is deployed with Active/Active mode. During a traffic spike, session table utilization reaches 90% on both firewalls. The engineer notices asymmetric routing and drops. What should be configured to optimize session distribution?
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
✓
Adjust the session distribution algorithm to match traffic patterns
In an Active/Active HA pair, session distribution is controlled by a hash-based algorithm that determines which firewall handles a given flow. When asymmetric routing and drops occur during high session utilization, the default algorithm may not distribute traffic evenly, causing one firewall to become overloaded. Adjusting the session distribution algorithm (e.g., from IP hash to round-robin or a weighted distribution) can better match the traffic patterns and balance the load, reducing asymmetry and drops.
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.
- ✗
Change the HA mode to Active/Passive
Why it's wrong here
Would reduce capacity.
- ✓
Adjust the session distribution algorithm to match traffic patterns
Why this is correct
Proper distribution reduces asymmetric routing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Increase the HA2 link bandwidth using link aggregation
Why it's wrong here
Link aggregation helps with sync bandwidth, not distribution.
- ✗
Enable session synchronization for all sessions
Why it's wrong here
Synchronizing all would increase CPU and memory.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume increasing HA2 bandwidth or enabling session synchronization will fix load imbalance, but these address sync throughput, not the root cause of uneven session distribution.
Detailed technical explanation
How to think about this question
The session distribution algorithm in Palo Alto Networks Active/Active HA uses a hash of the source and destination IP addresses (and optionally ports) to assign each flow to a specific firewall. When traffic patterns are skewed (e.g., many flows from a single IP), the hash can cause imbalance. Adjusting the algorithm to use round-robin or a different hash key (like source port) can spread sessions more evenly. In real-world scenarios, this is critical for environments with NAT or VPN concentrators where many sessions share the same source IP.
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
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?
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: Adjust the session distribution algorithm to match traffic patterns — In an Active/Active HA pair, session distribution is controlled by a hash-based algorithm that determines which firewall handles a given flow. When asymmetric routing and drops occur during high session utilization, the default algorithm may not distribute traffic evenly, causing one firewall to become overloaded. Adjusting the session distribution algorithm (e.g., from IP hash to round-robin or a weighted distribution) can better match the traffic patterns and balance the load, reducing asymmetry and drops.
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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