Virtual machines(1.2.1 h)

Question 1

What is a virtual machinie?

Answer 1

software that allows simulation of other machines

Question 2

What can virtual machines imitate?

Answer 2

any combination of hardware devices even if that piece of hardware doesn’t exist yet

Question 3

Alternate OS-uses of VM

Answer 3

can run an OS on another OS
can be used to run older versions on an OS or an Os that would not be able to run on the host machine

Question 4

Incompatible software-uses of VM

Answer 4

can run software that would usually be incompatible with the host machine

Question 5

Testing systems-uses of VM

Answer 5

are closed controlled environments so can test software that may otherwise cause damage to host machine if something goes wrong
could be software that is in very early development or anti-malware that needs to run malware to see if the software works

Question 6

Multiple servers-uses of VM

Answer 6

can house multiple logical servers on one physical device
can avoid the cost of buying extra hardware

Question 7

With multiple servers what happens if a single logic server fails?

Answer 7

the ret of the servers are unaffected

Question 8

Intermediate code

Answer 8

code must be translated from high level code into machine code before it can be read
can translate to intermediate code and rum on a VM as each CPU has different machine code

Question 9

What does JVM stand for?

Answer 9

Java Virtual Machine