1 Virtualization and Hypervisors Free Online FlashCards

What is virtualization?

Virtualization abstracts physical hardware so multiple isolated computing environments can share one physical computer.

What does a hypervisor do?

A hypervisor, also called a virtual machine monitor, creates and manages virtual machines.

Where does a Type 1 hypervisor run?

A Type 1 hypervisor runs directly on the computer’s hardware and manages guest VMs.

How does a hypervisor provide processor time to a VM?

The hypervisor schedules a VM’s vCPUs onto the host’s physical or logical processors when the guest needs processor time.

What does virtual memory represent to a guest, and what must the host provide?

A guest treats virtual memory as its own RAM, but the hypervisor must back it with host resources and retain enough capacity for the host.

How does a VM’s virtual disk relate to physical storage?

A VM sees virtual disks as drives, while host storage or a connected storage system supplies the actual capacity and handles the underlying input and output.

What connections can a virtual switch provide to a VM?

A virtual switch can connect a VM’s virtual network interface to other VMs, the host, or an external physical network.

What should administrators consider when planning VM resource allocations?

Plan for typical and peak demand, reserve capacity for the host, and monitor for bottlenecks across processor, memory, storage, and network resources.

What is a virtual machine?

A virtual machine (VM) is an isolated computing environment that runs its own guest operating system and applications using virtual hardware.

In virtualization, what distinguishes a host from a guest?

The host is the computer that runs VMs; the guests are the operating systems inside those VMs.

Where does a Type 2 hypervisor run?

A Type 2 hypervisor runs as software on top of a conventional host operating system.

What is the main difference between Type 1 and Type 2 hypervisors?

Their main difference is position in the software stack: Type 1 runs on the hardware, while Type 2 runs within a host operating system.