PCNSE Core Concepts and Architecture Practice Question
A company has two Palo Alto Networks firewalls configured in an active/passive HA pair. Traffic fails over correctly, but after a failover, existing sessions from external users to internal servers are broken. The security team wants to prevent this disruption. Which feature must be enabled?
⚠ Common exam trap
Watch out — candidates often confuse high-availability failover mechanisms (like link monitoring or path monitoring) with stateful session replication, assuming that any HA feature will preserve sessions, but only Session State Synchronization specifically copies the session table to the standby device.
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 State Synchronization
Session State Synchronization (option C) is required because it ensures that session table entries—including TCP state, sequence numbers, and application-layer metadata—are replicated from the active firewall to the passive firewall in real time. Without this, after a failover, the newly active firewall has no knowledge of existing sessions, causing it to drop packets and forcing clients to re-establish connections. This feature is specifically designed to maintain stateful session continuity during HA failovers.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Link Monitoring
Why it's wrong here
Link Monitoring triggers failover on link state change but does not preserve sessions.
- ✗
Virtual Router Redundancy
Why it's wrong here
Virtual Router Redundancy is not a feature; VRs are used for routing isolation.
- ✓
Session State Synchronization
Why this is correct
Session sync ensures the passive firewall has a copy of active sessions so they survive failover.
- ✗
Path Monitoring
Why it's wrong here
Path Monitoring monitors next-hop reachability but does not synchronize sessions.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.