27. Virtualization Flashcards
What is the main reason behind server virtualization?
Physical server hardware sources were underutilized. They did not use their full capacity.
What are bare metal servers?
Servers used only for a single OS and one single user
What is a virtual machine?
A software emulation of a physical server with an operating system.
What is a hypervisor?
The virtualization software that creates VMs and performs abstraction that allows multiple VMs to run.
What are the 2 types of hypervisors?
- Type 1 runs directly on the system hardware
- Type 2 requires a host OS to run (used for client devices)
What is a container?
An isolated environment where containerized applications run. It contains the application, along with the dependencies that the application needs to run.
What is a container image?
A file created by a container engine that includes the application code along with its dependencies.
What cannot be done with a vSwitch?
- Traffic cannot flow from one switch to another within the same host
- vSwitches cannot share the same pNIC
What is Network Functions Virtualization?
A architectural framework that defines standards to decouple network functions from proprietary hardware based appliances and have them run in standard x86 servers.