Which of the following enables resource balancing for hosts within a cluster?

vSphere DRS, or Distributed Resource Scheduler, plays a crucial role in enabling resource balancing for hosts within a cluster. It achieves this by continuously monitoring resource usage across all virtual machines and hosts within the cluster and making intelligent decisions regarding VM placement and load balancing. When resource demands fluctuate, DRS can automatically migrate virtual machines using vMotion to ensure even distribution of workloads, thus optimizing resource utilization and enhancing performance across the cluster.

This capability helps in maintaining efficiency, as it can respond to resource contention scenarios by redistributing workloads without requiring manual intervention, ensuring that no single host is overwhelmed while others are underutilized. The proactive balancing of resources not only aids performance but also enhances the overall stability and reliability of the virtual environment.

Other options like VMware HA (High Availability) focus on ensuring that virtual machines remain operational in the event of host failures through failover mechanisms, but do not actively manage resource loads amongst hosts. VMware EVC (Enhanced vMotion Compatibility) enables vMotion across different CPU generations but does not concern itself with balancing resources. vSphere SDN (Software-Defined Networking) is related to networking configurations and does not directly facilitate resource balancing among hosts. Thus, vSphere DRS is clearly the system designed for effective resource balancing in a