156-315.81.20 ClusterXL and VRRP High Availability Practice Question
Exhibit
cphaprob -a if Interface 1: eth0 - Connected Interface 2: eth1 - Connected Interface 3: eth2 - Down Interface 4: eth3 - Connected
Refer to the exhibit. What will happen to the ClusterXL HA member if 'eth2' is a monitored interface?
⚠ Common exam trap
Test-takers sometimes assume interface failures are merely logged without triggering state changes, forgetting that monitored interface down events cause cluster failovers.
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 cluster will trigger a failover to the standby member.
ClusterXL monitors the state of all configured interfaces. If a monitored interface is marked as 'Down', the cluster member evaluates whether this constitutes a failure. In a High Availability setup, if a critical interface fails, the cluster member will typically initiate a failover, marking itself as 'Down' or 'Standby' to ensure that traffic is routed through a member that has full network connectivity, thereby maintaining the overall health and availability of the gateway service.
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 member will remain active but logs a warning in SmartConsole.
Why it's wrong here
In HA mode, losing a monitored interface is a critical event. The firewall cannot reliably inspect or route traffic if a physical path is missing. Therefore, it does not just log a warning; it triggers a state transition to protect the network from being routed through a broken interface path.
- ✓
The cluster will trigger a failover to the standby member.
Why this is correct
If a monitored interface is down, the member's health check fails. To ensure traffic continuity, the cluster will trigger a failover, promoting the standby member to active. This is the intended behavior for High Availability to prevent traffic blackholing due to a loss of connectivity on one of the member's interfaces.
- ✗
The member will force all traffic through the synchronization interface.
Why it's wrong here
The synchronization interface is dedicated to CCP and state table synchronization. It is not designed or authorized to carry production traffic. Attempting to route user data through this link would result in significant performance issues and potential security vulnerabilities, as it would bypass the main security inspection policies enforced on standard interfaces.
- ✗
The cluster mode will automatically switch to Load Sharing.
Why it's wrong here
Cluster modes are static configurations defined in the cluster object. The cluster cannot dynamically change its fundamental operating mode due to an interface failure. Such a change would require a full reconfiguration and policy reinstall, which is impossible to perform automatically during a critical failure event such as an interface down.
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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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