27. Virtualization Flashcards

1
Q

What is the main reason behind server virtualization?

A

Physical server hardware sources were underutilized. They did not use their full capacity.

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2
Q

What are bare metal servers?

A

Servers used only for a single OS and one single user

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3
Q

What is a virtual machine?

A

A software emulation of a physical server with an operating system.

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4
Q

What is a hypervisor?

A

The virtualization software that creates VMs and performs abstraction that allows multiple VMs to run.

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5
Q

What are the 2 types of hypervisors?

A
  • Type 1 runs directly on the system hardware

- Type 2 requires a host OS to run (used for client devices)

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6
Q

What is a container?

A

An isolated environment where containerized applications run. It contains the application, along with the dependencies that the application needs to run.

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7
Q

What is a container image?

A

A file created by a container engine that includes the application code along with its dependencies.

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8
Q

What cannot be done with a vSwitch?

A
  • Traffic cannot flow from one switch to another within the same host
  • vSwitches cannot share the same pNIC
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9
Q

What is Network Functions Virtualization?

A

A architectural framework that defines standards to decouple network functions from proprietary hardware based appliances and have them run in standard x86 servers.

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