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?
Change the HA mode to Active/Passive
Why wrong: Would reduce capacity.
Adjust the session distribution algorithm to match traffic patterns
Proper distribution reduces asymmetric routing.
Increase the HA2 link bandwidth using link aggregation
Why wrong: Link aggregation helps with sync bandwidth, not distribution.
Enable session synchronization for all sessions
Why wrong: Synchronizing all would increase CPU and memory.
Answer choices
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
Option B is correct because Active/Active uses a distribution function (like IP hash) to assign sessions to a firewall; optimizing the hash algorithm for traffic profile reduces asymmetry. Option A is wrong because session syncing all sessions would increase load. Option C is wrong because passive mode defeats purpose. Option D is wrong because link aggregation does not solve session distribution.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
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
Static NAT maps one inside address to one outside address.
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
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSE NAT questions on configuration and troubleshooting.
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FAQ
Managing Troubleshooting and High Availability — This question tests Managing Troubleshooting and High Availability — Static NAT maps one inside address to one outside address..
The correct answer is: Adjust the session distribution algorithm to match traffic patterns — Option B is correct because Active/Active uses a distribution function (like IP hash) to assign sessions to a firewall; optimizing the hash algorithm for traffic profile reduces asymmetry. Option A is wrong because session syncing all sessions would increase load. Option C is wrong because passive mode defeats purpose. Option D is wrong because link aggregation does not solve session distribution.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related PCNSE NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
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