156-315.81.20 ClusterXL and VRRP High Availability Practice Question
A security administrator is deploying a ClusterXL High Availability cluster and needs to ensure that the cluster will successfully synchronize kernel tables between members. Which two conditions are required for successful synchronization? (Choose two.)
⚠ Common exam trap
The trap here is assuming that identical hardware or a management server in the cluster is necessary, when the real requirements are the sync interface and matching software versions.
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
✓
The synchronization interface must be configured and reachable between members.
Successful ClusterXL synchronization requires a dedicated, reachable synchronization interface and identical software versions and hotfix levels on all members. These conditions ensure that kernel table updates can be transmitted and interpreted correctly. Hardware differences and management server placement do not affect synchronization, and not all interfaces need to be on the same broadcast domain.
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 identical hardware specifications.
Why it's wrong here
ClusterXL does not require identical hardware. Members can have different CPU, memory, or network cards as long as they meet the minimum requirements and run compatible software versions. Hardware differences do not prevent synchronization. The focus should be on software compatibility and network configuration, not identical hardware.
- ✓
The synchronization interface must be configured and reachable between members.
Why this is correct
A dedicated synchronization interface is essential for ClusterXL to exchange kernel table updates. It must be properly configured in the cluster topology and reachable by all members. If the sync interface is down or blocked, synchronization fails, and the standby member cannot maintain an up-to-date state, leading to potential failover issues.
- ✗
The cluster members must be connected to the same broadcast domain on all interfaces.
Why it's wrong here
While the synchronization interface typically requires layer 2 connectivity, not all interfaces must be on the same broadcast domain. ClusterXL can operate across routed networks for production traffic, and only the sync interface needs direct connectivity. Requiring all interfaces on the same broadcast domain is incorrect and would unnecessarily restrict network design.
- ✓
The same Check Point software version and hotfix level must be installed on all members.
Why this is correct
For synchronization to work correctly, all cluster members must run the same Check Point software version and hotfix level. Mismatched versions can cause kernel table formats to differ, leading to synchronization failures or unpredictable behavior. Check Point strongly recommends keeping all members at the same version and patch level.
- ✗
The management server must be a member of the cluster.
Why it's wrong here
The management server is separate from the cluster members and is not part of the synchronization process. ClusterXL synchronization occurs directly between gateway members. Including the management server in the cluster is not required and could introduce security risks. The management server's role is to manage policies, not to synchronize kernel tables.
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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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