27. Virtualization

Question 1

What is the main reason behind server virtualization?

Answer 1

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

Question 2

What are bare metal servers?

Answer 2

Servers used only for a single OS and one single user

Question 3

What is a virtual machine?

Answer 3

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

Question 4

What is a hypervisor?

Answer 4

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

Question 5

What are the 2 types of hypervisors?

Answer 5

• Type 1 runs directly on the system hardware

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

Question 6

What is a container?

Answer 6

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

Question 7

What is a container image?

Answer 7

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

Question 8

What cannot be done with a vSwitch?

Answer 8

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

Question 9

What is Network Functions Virtualization?

Answer 9

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