156-315.81.20 ClusterXL and VRRP High Availability Practice Question
A security administrator is deploying a new ClusterXL High Availability cluster with two members. The administrator needs to ensure that the cluster can properly synchronize state and perform failover. Which two actions are required to configure the synchronization network? (Choose two.)
⚠ Common exam trap
The trap here is assuming that the synchronization interface should be configured like a cluster interface with a virtual IP, or that VRRP is needed for redundancy.
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
✓
Assign a dedicated interface on each member for synchronization and configure it with a unique IP address on each member.
To configure the synchronization network in a ClusterXL High Availability cluster, each member needs a dedicated interface with a unique IP address, and this network should be separate from the data network to avoid interference. Using the same IP address, enabling VRRP, or configuring a virtual IP on the sync interface are incorrect and can cause communication failures or unnecessary complexity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Configure the synchronization interface as a cluster interface with a virtual IP address.
Why it's wrong here
The synchronization interface should not be configured as a cluster interface with a virtual IP. It is a dedicated point-to-point or dedicated network interface for sync traffic only. Adding a virtual IP could cause confusion and is not required. Cluster interfaces are for data traffic and have virtual IPs, while sync interfaces have unique physical IPs.
- ✗
Enable VRRP on the synchronization interface to provide redundancy.
Why it's wrong here
VRRP is not used on the synchronization interface. ClusterXL synchronization uses its own protocol and does not rely on VRRP. Enabling VRRP would add unnecessary complexity and could interfere with sync communication. The synchronization interface should be configured as a regular interface, not as part of a VRRP group.
- ✓
Assign a dedicated interface on each member for synchronization and configure it with a unique IP address on each member.
Why this is correct
A dedicated synchronization interface is recommended to avoid contention with data traffic. Each member must have a unique IP address on that interface so they can communicate directly. This is a fundamental requirement for ClusterXL synchronization. Without unique addresses, the members cannot establish a sync connection.
- ✗
Configure the synchronization interface to use the same IP address on both members.
Why it's wrong here
Using the same IP address on both members would cause an IP conflict and prevent communication. Each member must have a unique IP address on the synchronization interface. This is a basic networking principle and is required for ClusterXL to function. The same IP address is used for the cluster virtual IP, not for the sync interface.
- ✓
Ensure that the synchronization interface is configured with a network that is separate from the data network.
Why this is correct
Separating synchronization traffic from data traffic prevents interference and ensures reliable state synchronization. A dedicated network reduces latency and avoids congestion that could impact sync performance. This is a best practice and often a requirement for optimal ClusterXL operation, especially in high-throughput environments.
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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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