Which statement best reflects OS version compatibility for cluster nodes in Windows Server Failover Clustering?

Which statement best reflects OS version compatibility for cluster nodes in Windows Server Failover Clustering?

• A. All nodes must run the identical Windows Server version.
• B. Nodes can run different Windows Server versions.
• C. OS version compatibility is not a concern.
• D. Only the domain controller needs to match the OS version.

Answer: (A)

In Windows Server Failover Clustering, keeping all cluster nodes on the same Windows Server version ensures that the cluster service binaries, protocols, and resource types stay in sync across every node. The cluster relies on consistent communication and data structures between nodes to coordinate failovers, maintain the shared quorum, and manage resources. If one node runs a different OS version, there can be binary incompatibilities or unsupported interactions that destabilize the cluster or prevent it from functioning correctly. That’s why the best choice states that all nodes must run the identical Windows Server version. It reflects the need for a uniform environment so the cluster service on every node can interpret cluster state, resource types, and failover logic the same way. The other options misstate the requirements: mixing OS versions is not supported in a production cluster, OS version compatibility is indeed a concern, and the OS version of domain controllers is not the factor that governs node compatibility in a failover cluster.

In Windows Server Failover Clustering, keeping all cluster nodes on the same Windows Server version ensures that the cluster service binaries, protocols, and resource types stay in sync across every node. The cluster relies on consistent communication and data structures between nodes to coordinate failovers, maintain the shared quorum, and manage resources. If one node runs a different OS version, there can be binary incompatibilities or unsupported interactions that destabilize the cluster or prevent it from functioning correctly.

That’s why the best choice states that all nodes must run the identical Windows Server version. It reflects the need for a uniform environment so the cluster service on every node can interpret cluster state, resource types, and failover logic the same way.

The other options misstate the requirements: mixing OS versions is not supported in a production cluster, OS version compatibility is indeed a concern, and the OS version of domain controllers is not the factor that governs node compatibility in a failover cluster.