Virtualization

Question 1

Hardware virtualization

Answer 1

Takes the entire computer that an OS expects to interact with and virtualizes it
Physical host computer uses a Hypervisor to create environments that have virtual versions of all the “hardware” devices you need to install and run an OS

Question 2

Hypervisor

Answer 2

Allocates fractions of the hosts real hardware resources to power these virtual devices

Question 3

VM

Answer 3

Virtual machines
The environments created by the Hypervisor to be used for virtualization

Question 4

Client side virtualization

Answer 4

When the VM host also serves as someone’s day to day workstation

Question 5

Benefits of virtualization

Answer 5

1. Saving resources
2. Systems easier to manage

Question 6

Purpose of virtualization

Answer 6

1. Sandboxing
2. Development testing
3. Application virtualization

Question 7

Application virtualization

Answer 7

1. Legacy software/OS: running applications for a different software
2. Cross-platform virtualization: running applications written for another OS

Question 8

VM networking

Answer 8

1. Internal network created for VMs within the same Hypervisor
2. Virtual network only allowing communication with host system
3. “Bridge” virtual NIC with host NIC for VM to join same network host is connected to
4. No network, isolating VM from host, broader network, and other VMs

Question 9

Type-1 Hypervisor

Answer 9

Bare-metal Hypervisor
No other software between the hypervisor and the hardware

Question 10

Type-2 Hypervisor

Answer 10

Applications like virtualbox on an OS

Question 11

The service-layer cake

Answer 11

Software as a service (SaaS)
Platform as a service (PaaS)
Infrastructure as a service (IaaS)

Question 12

SaaS

Answer 12

Top layer of “cake”
Web applications
Ex. Google maps etc

Question 13

PaaS

Answer 13

Middle layer
Gives programmers all the tools they need to deploy, administer, and maintain a Web application
Built on an infrastructure that is invisible to the developer
Developer has no direct control of the infrastructure

Question 14

IaaS

Answer 14

Bottom layer
Just hardware provided by companies like Amazon (AWS)
Still responsible for configuring and maintaining the OS and software of any created virtual machines

Question 15

Cloud resources

Answer 15

Shared resources
Rapid elasticity
Metered utilization
High availability
File sync

Question 16

Public cloud

Answer 16

Software, platforms, and infrastructure delivered through networks that the general public can use
Hardware often provided by companies like google, Amazon, and microsoft

Question 17

Private cloud

Answer 17

Internal cloud built by a company for themselves
Needs complete ownership of data with flexibility of the cloud
Departments can build and destroy VMs as needed
Can afford to build and maintain the IaaS it will be built on
Can also hire a 3rd party to build and maintain/host for them

Question 18

Community cloud

Answer 18

Private cloud paid for and used by multiple organizations
Not for citizens use
Used by groups of organizations with similar goals/needs

Question 19

Hybrid cloud

Answer 19

Some combination of private, public, and community cloud services
Allows communication between the different cloud services for that company
Application can grow into a public cloud instead of grind to a halt, while maintaining privacy data

Question 20

VDI

Answer 20

Virtual desktop infrastructure
Desktop virtualization in which each users client programs connect to an automatically managed virtual machine running on a central server
Can be set up on premises or in the cloud