156-315.81.20 ClusterXL and VRRP High Availability Practice Question
A Check Point administrator is deploying a ClusterXL High Availability cluster with two members. The administrator wants to ensure that the cluster can properly synchronize connection tables and maintain state during failover. Which two conditions must be met for successful synchronization? (Choose two.)
⚠ Common exam trap
The trap here is assuming that hardware or interface parity is necessary, when in fact software version and a working sync network are the critical requirements.
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
✓
Both cluster members must run the same Check Point software version and patch level.
Successful ClusterXL synchronization requires that both members run the same software version and patch level, and that a synchronization network is properly configured and reachable. Version consistency ensures that Full Sync can transfer kernel tables without compatibility issues. A dedicated sync network provides the communication path for state updates. These two conditions are essential for maintaining synchronized connection tables and ensuring seamless failover.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The cluster members must have the same number of network interfaces.
Why it's wrong here
The number of network interfaces does not need to be identical for synchronization. ClusterXL synchronizes connection tables and state, not interface configurations. However, for proper failover, the interface configuration should be similar to ensure that the standby member can take over all connections. But it is not a strict requirement for synchronization itself.
- ✓
Both cluster members must run the same Check Point software version and patch level.
Why this is correct
Synchronization requires identical software versions and patch levels because the kernel table structures must match. If versions differ, Full Sync will fail, and Delta Sync may not work correctly. This is a fundamental requirement for ClusterXL synchronization. Ensuring version consistency is critical before forming a cluster.
- ✗
The cluster members must be configured with the same cluster ID and cluster name.
Why it's wrong here
Cluster members must belong to the same cluster object, which implies they share the same cluster ID and name. However, this is a configuration requirement for forming a cluster, not specifically for synchronization. Synchronization is about state exchange between members that are already part of the same cluster. While it is necessary, it is not one of the two conditions specifically required for synchronization; version and sync network are more directly related to the sync process.
- ✓
The synchronization network must be configured and reachable between the cluster members.
Why this is correct
A dedicated synchronization network is required for ClusterXL members to exchange state information. This network must be reachable and have sufficient bandwidth. Without it, synchronization cannot occur. It is recommended to use a dedicated interface for sync to avoid interference with production traffic. The sync network can be a direct crossover cable or a switch.
- ✗
Both cluster members must have identical hardware configurations.
Why it's wrong here
Identical hardware is not required for synchronization. ClusterXL can synchronize between members with different hardware as long as the software versions and configurations are compatible. Hardware differences may affect performance but do not prevent synchronization. The key requirements are software compatibility and network connectivity for sync.
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Check Point exam blueprint
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