OS, context switch, buffer, CPU scheduler

Question 1

What is an Operating System (OS)?

Answer 1

A piece of software that makes it easier to create and run apps

Question 2

The OS manages what?

Answer 2

Manages a system’s hardware and software resources

Question 3

The OS provides what?

Answer 3

Provides a User Interface

Question 4

The OS does two things with common tasks:

Answer 4

Simplifies and unifies common tasks

Question 5

Desktop OS

Answer 5

Multi-user, UI, and user focused

Question 6

Server OS

Answer 6

Services, 24/7, and not intended for users directly.

Question 7

Mobile OS

Answer 7

1 user, small screen, and battery focused.

Question 8

Real-time OS

Answer 8

Embedded, Event driven, and no keyboard/mouse/screen

Question 9

Context switch

Answer 9

When a process that is executing is switched out for another.

Question 10

When does Context switch occur in a CPU?

Answer 10

When a process is blocked, or to give another process some time to work

Question 11

Buffer Overflow attack

Answer 11

The CPU can’t distinguish data and instructions. The CPU fetches and treats data as an instruction.

Question 12

CPU scheduler

Answer 12

Controls time sharing in the CPU, and handles time slicing, process execution and prioritisation.