Virtualisation Flashcards
where are the two main places we see virtualisation
memory and timesharing
what is the principle of virtualisation
maintain the potential of many resources and organise the actual resources around that
describe virtual machines
one physical machine may appear as several different ones.
what is an emulator
runs a software model of a separate machine
what are the benefits of virtual machines
simple control over security
can emulate any machine
can collect extra info, making debugging easier
what is the drawback of virtual machines
using software to model hardware is slow
how does a multitasking system act like virtual machines
each process is likes its own VM
what is a hypervisor
it allows more than one operating system to run on a single machine
what are the benefits of a hypervisor
one computer but many software possibilities
portable software
one single powerful piece of hardware instead of multiple
what are the two types of hypervisor
type one
adjacent to hardware
type two
under host OS
what is a virtual network
remote machines appear as if locally connected.
bad for security
