Which feature is a pre-requisite for configuring admission control on a cluster? (Choose the best answer.)
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A. B. C. D.B.
The correct answer is B. vSphere High Availability (HA).
Admission control is a vSphere feature that ensures that sufficient resources are available in a cluster to support virtual machine (VM) failover during an HA event. Admission control prevents overcommitment of cluster resources that could cause a VM to fail to restart after an HA event. Therefore, configuring admission control is crucial to maintaining the availability of VMs in an HA cluster.
To configure admission control, a pre-requisite is to enable vSphere High Availability (HA) on the cluster. vSphere HA provides availability for VMs in the event of a host failure by restarting them on a different host within the cluster. Once vSphere HA is enabled, admission control can be configured to set policies that dictate how many host failures the cluster can tolerate while ensuring that sufficient resources are available to support the VMs.
While the other options listed in the question are important features in vSphere, they are not pre-requisites for configuring admission control. Here is a brief overview of each:
A. vSphere Enhanced vMotion Compatibility (EVC) - allows vMotion between hosts with different CPU vendors or versions, but it is not required for admission control. C. vSphere Fault Tolerance - provides continuous availability for VMs in the event of a host failure by creating a secondary VM that runs in lockstep with the primary VM, but it is not required for admission control. D. vSphere Distributed Resource Scheduler (DRS) - automatically balances resources across hosts in a cluster to optimize performance, but it is not required for admission control.