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Ch. 18: Virtualization
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Terms in this set (66)
What is virtualization?
Creates an environment for an operating system to function as if it were installed on its own computer.
When a computer runs a version of another OS located on a different system.
* creates a complete environment for a guest operating system to function as if installed on its own computer.
What is a host?
The system/PC running a virtual machine.
What is a virtual machine (VM)?
The guest environment
What is a guest?
An operating system running inside of a virtual machine.
Benefits of Virtualization
What are the top four benefits of virtualization to companies?
Power saving, hardware consolidation, system management and security, and research.
How does virtualization help to save power?
Allows you to put multiple virtual servers or clients on a single physical system instead of many.
What allows virtualization to consolidate hardware?
Due to low power output, Thin clients can be used instead of regular Desktops
How does virtualization help system management and security?
Virtual Machines are basically files, allowing them to be copied easily across multiple systems for specific needs. Also, if a system goes down, it can be repaired by simply reloading a clean copy of the virtual machine.
*If a system is infected with malware, you can shut down the VM and restore a clean copy of it, rather than restore a physical PC.
What is a snapshot/checkpoint?
Saves the virtual machine's state at a specific moment, allowing you to return to this state later.
Why are snapshots not used as long term backup strategies?
Each one reduces performance of the system.
* Virtualization eliminates the need to keep several machines on hand with various OSs for:
software testing, support, or similar purposes.
What is a supervisor?
Programming used by normal operating systems that handles low-level interactions among hardware and software.
What is a hypervisor?
Programming that enables a single computer to run multiple operating systems simultaneously.
What is an emulator?
Software or hardware that converts the commands to and from the host machine into an entirely different platform.
What are the main hypervisors for Windows?
Hyper-V , VMware, and Oracle VM Virtualbox.
Hyper-V comes with ______________________.
Windows 8.1 pro and Windows Server.
Oracle VM VirtualBox runs on _________________________.
Windows, Mac OS, and Linux.
VMWare Parallels allows you to ________________________.
install Windows onto the virtual Mac OS
What is the distinction between virtualization and emulation?
Virtualization cannot virtualize hardware that is on a different platform (such as running Nintendo 64 on Windows).
What is client-side virtualization?
Running a virtual machine on a local system regardless of whether the file might be stored locally or on a central network.
What is the basic process for creating virtual machines?
1. Set up the hardware
2. Install a hypervisor .
3. Create a new virtual machine.
4. Start the virtual machine and install the guest OS.
What is hardware virtualization support?
What extra features were added on Intel and AMD systems to support hypervisors?
Intel's VT-x and AMD's AMD-V
Where can hardware virtualization be turned on and off?
The system setup utility.
The more virtual machines you run, the more __________ you need.
What are the two issues to keep in mind when it comes to RAM for virtual machines?
Leave enough RAM for the hypervisor to run adequately, and add enough RAM so that every virtual machine you run at the same time will run adequately.
What affects the size of the VM file?
Applications that have been downloaded, as well as snapshots or checkpoints.
In what situation will a hypervisor use emulation?
With a network interface card (NIC).
What is internal networking?
Allows every virtual machine running on a hypervisor to act as though it's connected to its own switch.
What is bridged networking?
Allows the virtual machine to connect to the internet by connecting the virtual NIC to the real one.
In order to connect a network of virtual machines, hypervisors create _________________________.
How do you activate Hyper-V in Window 8/8.1/10?
Go to the Programs and Features Control Panel applet and select "Turn Windows features on or off".
How do you create a Virtual Machine?
Click New | Virtual Machine. This will start the wizard.
Every virtual machine requires a ____________________ of Windows.
separate, legal copy
All virtual machine managers enable you to use ____________________________________.
the host machine's optical drive, a USB thumb drive, or an ISO file.
What can be used as an optical drive for a virtual machine?
An ISO image.
What is the main difference between a real machine and a virtual one?
A virtual machine uses CTRL+ALT+INSERT instead of the traditional CTRL+ALT+DELETE
What is a virtual desktop?
A traditional desktop OS installed in a virtual machine.
What is bare-metal hypervisor?
A hypervisor installed on a machine without an original operating system.
Also known as type 1
What is known as a type 2 hypervisor?
Applications such as VMware Workstation.
What is ESXi?
A hypervisor that replaces the host operating system in a computer, turning it into a system that only supports virtual ones.
A host running its hypervisor from flash memory can dedicate all of its available disk space to ________________________.
To the Cloud
Since virtual machines are just files running on a hypervisor, they can be run ____________________.
in the cloud
How does the cloud work?
Utilizes large groups of virtualized servers, and allows customers to click and start a desired server.
What is Infrastructure as a Service (IaaS)?
Uses virtualization to minimize hardware, protect against data loss and downtime, and respond to spikes in demand.
Sells infrastructure as a service.
What do IaaS providers like Amazon Web Services (AWS) allow users to do?
Launch virtual servers using an operating system of their choice on demand.
What is the benefit of IaaS?
Eliminates the need to buy expensive, heavy hardware.
What is the downside of IaaS?
Although not responsible for hardware, the user must maintain the operating system and software for every created virtual machine.
What is Platform as a Service (PaaS)?
Gives programmers the ability to deploy, administer, and maintain a web application.
What is the important point of PaaS?
It's built on top of infrastructure, but the infrastructure is invisible to the developer.
What is Software as a Service (SaaS)?
What is an advantage for SaaS?
Provides access to applications wherever there is an internet connection.
On a business level, it simplifies budgeting and helps to keep thousands of computers up to date.
What is the downside to Saas?
Users often have to endure strict control of their data. Also, companies have concerns over security of their property.
What is a public cloud?
Describes software, platforms, and infrastructure delivered through networks the general public use.
What are the public cloud concepts?
Public IaaS, Public PaaS, and Public SaaS
What is the private cloud?
Cloud networks built and maintained by or explicitly for a specific company or organization.
What is a community cloud?
A private cloud paid for and used by multiple organizations.
What is the hybrid cloud?
A combination of cloud resources from other cloud types, such as public, private, and community
The cloud relies on ________________________.
What is rapid elasticity?
The expansion of servers within a Web Application due to increased traffic.
What is on-demand?
Allows a web application to add or reduce capacity based on demand.
What is resource pooling?
Consolidating resources from many systems into a smaller number of more powerful systems.
What is a measured service?
Cloud services that are billed based on the computing resources consumed.
THIS SET IS OFTEN IN FOLDERS WITH...
Ch. 17: Troubleshooting Operating Systems **
Ch. 16: Working with the Command-Line Interface
Ch. 4: Microprocessors ***
Ch. 5: RAM ***
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