156-315.81.20 ClusterXL and VRRP High Availability Practice Question
Exhibit
cphaprob -a if eth1: 192.168.1.1 UP eth2: 10.0.0.1 DOWN eth3: 172.16.1.1 UP
Refer to the exhibit. A Security Administrator notices that the cluster is failing over unexpectedly. What is the most likely cause based on the output provided?
⚠ Common exam trap
Candidates often look for complex software or synchronization errors. When an interface is down, the most direct explanation is a physical or configuration fault on that specific interface.
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 interface eth2 has encountered a physical or configuration fault, triggering a member failure.
The exhibit shows eth2 is in a DOWN state. In ClusterXL, if an interface configured for cluster synchronization or traffic monitoring goes down, the member marks its critical devices as failed. This forces the member to transition to a down state to prevent traffic blackholing. Monitoring interface status is critical for proactive cluster maintenance, ensuring high availability is not compromised by physical layer or configuration failures.
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 is operating in Load Sharing mode, causing eth2 to drop traffic.
Why it's wrong here
Load Sharing mode distributes traffic across members, but it does not cause interfaces to report as DOWN. A DOWN interface indicates a physical layer issue, a cable disconnection, or a configuration mismatch in the OS that prevents the interface from initializing correctly regardless of the cluster mode.
- ✓
The interface eth2 has encountered a physical or configuration fault, triggering a member failure.
Why this is correct
The output explicitly shows eth2 as DOWN. When a monitored interface fails, the ClusterXL mechanism considers the member's health compromised. Consequently, the member will initiate a failover to ensure traffic is directed to a healthy node that maintains full connectivity to all required network segments.
- ✗
A policy synchronization failure is causing the interface to disable itself.
Why it's wrong here
Policy synchronization errors occur at the management plane level and do not physically disable interfaces on the gateway. An interface reported as DOWN in the cluster state output is strictly a layer 1 or layer 2 issue related to the physical port or its logical OS configuration.
- ✗
The cluster is using VRRP, and eth2 is the backup interface waiting for election.
Why it's wrong here
VRRP interfaces remain UP even on backup nodes. A DOWN status indicates the interface is not ready for packet processing, which is an error state. VRRP nodes monitor virtual IP status, but the physical interface itself must remain UP to maintain connectivity and participate in election processes.
Visual reference
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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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