VCA vSphere High Availability & Fault Tolerance

Question 1

What does VMware vSphere High Availability (HA) protect against?

Accepted Answer

Unplanned ESXi host failures by automatically restarting VMs on other cluster hosts

Answer

Planned maintenance downtime for ESXi hosts

Answer

Storage array failures by replicating data in real time

Answer

Network outages by rerouting traffic around failed uplinks

Question 2

What is the role of the HA master host in a vSphere HA cluster?

Accepted Answer

It monitors heartbeats from slave hosts and orchestrates VM restarts on failure

Answer

It runs all virtual machines in the cluster

Answer

It manages vCenter Server licensing for the cluster

Answer

It serves as the primary storage node for all datastores

Question 3

What is VMware Fault Tolerance (FT) and how does it differ from HA?

Accepted Answer

FT keeps a shadow VM running in lockstep for zero-downtime failover, while HA restarts VMs

Answer

FT restarts VMs after failure, while HA keeps a shadow VM running in lockstep

Answer

FT protects storage while HA protects compute resources

Answer

FT requires shared storage while HA works with local storage

Question 4

What is an HA admission control policy used for?

Accepted Answer

Ensuring the cluster retains enough capacity to restart VMs after a host failure

Answer

Restricting which administrators can power on VMs in the cluster

Answer

Controlling which datastores new VMs can be provisioned on

Answer

Setting the order in which VMs restart after an HA event

Question 5

What is the maximum number of vCPUs supported per VM when VMware Fault Tolerance (FT) is enabled?

Accepted Answer

8 vCPUs

Answer

1 vCPU

Answer

4 vCPUs

Answer

16 vCPUs

Question 6

What are datastore heartbeats used for in a vSphere HA cluster?

Accepted Answer

Distinguishing between a network partition and a host failure

Answer

Synchronizing snapshots across cluster hosts

Answer

Replicating VM disk files between datastores

Answer

Verifying storage performance benchmarks