High Availabilty

Question 1

vSphere what technologies to ensure that virtual machines running in the environment remain available?
There are 5

Answer 1

• Virtual machine migration
• Multiple I/O adapter paths
• Virtual machine load balancing
• Fault tolerance
• Disaster recovery tools

Question 2

vSphere HA provides a ____ level of protection for your virtual machines by restarting virtual machines in the event of a ____ failure.

Answer 2

base level

host failure

Question 3

vSphere Fault Tolerance provides continuous _______ by ensuring that the _____ of the primary and secondary VMs are identical at any point in the instruction execution of the virtual machine

Answer 3

availability

states

Question 4

In vSphere what provides a higher level of availability, allowing users to protect any virtual machine from a host failure with no loss of data, transactions, or connections?

Answer 4

vSphere Fault Tolerance

Question 5

vSphere Fault Tolerance provides availability to protect vms from a _____ _____:
Ensuring vm have no loss of what? (3)

Answer 5

host failure

no loss of data, transactions or connections

Question 6

What 2 vSphere capabilities keep virtual machines available during a planned outages?
(ex. when hosts or storage taken offline for maintenance. System recovery from unexpected storage failures is simple, quick, and reliable with the encapsulation property of virtual machines.)

Answer 6

vSphere vMotion

vSphere Storage vMotion

Question 7

vSphere® _______ enables a vSphere platform to protect virtual machines natively by copying their disk files to another location where they are ready to be recovered.

Answer 7

Replication

Question 8

Virtual machine _________ is leveraged by backup applications such as vSphere Data Protection
and third-party backup applications that support file and image-level backups to protect data.

Answer 8

encapsulation

Question 9

vSphere ______ _______ protects against hardware and operating system failures.

Answer 9

High Availability (HA)

Question 10

vSphere HA uses multiple ____ ______ that are configured as a cluster to provide rapid recovery from outages and cost-effective high availability
for applications running in virtual machines.

Answer 10

ESXi hosts

Question 11

How does vSphere HA protects application availability?

Answer 11

• server failure by restarting the vm on other hosts within the cluster.
• application failure by monitoring a vm and resetting it when a failure is detected.
• datastore accessibility failures, provides automated recovery for affected vm. (VMCP)
• network isolation by restarting them if their host becomes isolated on the management or vSAN network.

Question 12

When experiencing datastore accessibility failures, the affected vm are restarted on other hosts that still have access to the datastores. This is done by the?

Answer 12

Virtual Machine Component Protection (VMCP)

Question 13

vSphere HA with vSphere ______ to protect against failures and to provide load balancing across the hosts within a cluster.

Answer 13

DRS

Question 14

If an ESXi host crashes, ______ ______has the responsibility of restarting virtual machines that were running on the failed host on the remaining hosts in the cluster.

Answer 14

vSphere HA

Question 15

When a virtual machine stops sending _______, the guest operating system is ______. The virtual machine stays on the same host.

Answer 15

heartbeats

reset

Question 16

Heartbeats are sent between who to determine whether a host has failed?

Answer 16

sent between master and slave host

Question 17

Redundant heartbeat networks ensure ______ ______ detection, and minimize the chance of host isolation scenarios.

Answer 17

reliable failure

Question 18

A Heartbeat network is implemented using what 2 objects?

Answer 18

• a VMkernel port that is marked for management.
•a VMkernel port that is marked for virtual SAN traffic,
when vSAN is in use.

Question 19

You can use _____ _______ to create a redundant heartbeat network on ESXi hosts.
Ports or port groups used must be ______ ports.

Answer 19

NIC teaming

VMkernel

Question 20

You can also create redundancy by configuring more _______ _______

Answer 20

heartbeat networks

Question 21

Redundant Heartbeat networks can be created using a second ____ ______ on a separate ______ ______with its own physical adapter. (on each host)

Answer 21

VMkernel port

virtual switch

Question 22

To determine which host will be the master, an election process takes place. The system that can
access the greatest number of ________ is elected the master.

Answer 22

datastores

Question 23

vSphere HA agents communicate with each other over

the _______ network or the ____ network in a _____cluster

Answer 23

management
vSAN network
vSAN cluster

Question 24

After the master agent has been determined,

master and slave hosts communicate using the secure ______ _______ ______

Answer 24

Transmission Control Protocol (TCP)

Question 25

When vSphere HA is started, vCenter Server contacts the master host agent and sends a list of _____ with __________ in the cluster along with the cluster configuration.

Answer 25

hosts | membership

Question 26

A list of hosts with membership in the cluster along with the cluster configuration is saved to _____ _____ on the master host and then pushed out to the slave hosts in the cluster.

Answer 26

local storage

Question 27

A slave host monitors the _____ of virtual machines running locally and sends state changes to the master host. A slave host also monitors the health of the _____ ______

Answer 27

health | master host.

Question 28

If the management network used to communicate with the master fails, the slave switches to another ________ ______ to communicate with the master host.

Answer 28

management interface

Question 29

If the slave host does not respond within predefined timeout period, the master host declares the slave host as agent ______

Answer 29

unreachable

Question 30

What are used as a backup communication channel to detect virtual machine and host heartbeats?

Answer 30

Datastores

Question 31

When an ESXi host cannot see traffic coming from the other hosts in the cluster and cannot ping the default gateway the host is?

Answer 31

Isolated

Question 32

If the ESXi host is isolated because it cannot ping the default gateway (or isolation address) and sees no management network traffic, the host executes the _____ ______ _____.

Answer 32

Host Isolation Response

Question 33

What is used in vSphere to share physical resources between a group of ESXi hosts?

Answer 33

cluster