PCNSA Device Management and Services Practice Question
A company is deploying a Palo Alto firewall in a high-availability (HA) pair. They want to ensure that when a failover occurs, session information is preserved to maintain active connections. Which feature must be enabled?
⚠ Common exam trap
Test-takers frequently confuse the general concept of 'stateful failover' (which is the desired outcome) with the specific feature name that must be enabled in the Palo Alto configuration, leading them to select option B instead of the precise mechanism 'session synchronization'.
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
✓
Session synchronization
Session synchronization (option A) is the correct feature because it enables the active firewall to share session table entries with the passive peer in real time. When a failover occurs, the newly active firewall already has the session state, so it can continue forwarding traffic for existing connections without interruption. Without session synchronization, all active sessions would be dropped and must be re-established by clients.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Session synchronization
Why this is correct
Session synchronisation replicates the Layer 4 session table and, where configured, application state between the HA peers, so established flows continue through the newly active firewall after failover. It directly satisfies the stem's requirement to preserve session information and maintain active connections, unlike configuration-only HA synchronisation.
- ✗
Stateful failover
Why it's wrong here
Stateful failover is not a separate toggle on Palo Alto firewalls; session preservation is achieved by enabling HA session synchronisation between peers. It is tempting because the term describes the desired outcome, but the actual configuration is HA session setup, which replicates session tables so active connections survive a failover.
- ✗
Packet buffer
Why it's wrong here
Packet buffer reserves memory for traffic bursts during oversubscription; it does not synchronise session tables between HA peers, so established flows still drop on failover. It is tempting because buffering sounds like it preserves in-flight traffic, and would be correct when tuning throughput on a single firewall experiencing microbursts.
- ✗
Session Timer adjustment
Why it's wrong here
Session timers govern how long idle sessions remain in the table; they do not replicate session state to the passive peer, so connections still reset at failover. It is tempting because adjusting timeouts appears to protect long-lived sessions, and would be correct for preventing premature ageing of idle sessions on a standalone device.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This PCNSA 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 PCNSA exam.