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

vSphere HA monitors ESXi hosts in a cluster and automatically restarts virtual machines on surviving hosts when a host failure is detected.

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

The HA master host monitors all slave hosts via network and datastore heartbeats, and is responsible for restarting VMs when it detects that a slave host has failed.

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 maintains a live shadow VM that mirrors the primary VM in real time, providing zero-downtime failover, whereas HA simply restarts VMs after detecting a host failure.

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

HA admission control reserves cluster resources (CPU and memory) to guarantee that surviving hosts have sufficient capacity to restart all VMs from a failed host.

Question 5

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

Accepted Answer

8 vCPUs

Answer

In vSphere 6.x and later, FT supports up to 8 vCPUs per protected virtual machine.

VCA - VCA-DCV VMware Certified Associate on vSphere Practice Test

VCA - VCA-DCV VMware Certified Associate on vSphere Practice Test

VCA vSphere High Availability & Fault Tolerance