Operating Systems Quiz 1 David Jackson

contains entry for each I/O device indicating its type, address, and state

Device-Status Table

operation allows OS to protect itself and other system components - User mode and kernel mode◦Some instructions are only executable in kernel mode, these are privileged

Dual Mode

________ interface consists of things like program counter, registers, interrupts and terminals A. Hardware B. Software C. Data D. None

A. Hardware

______ shares characteristics with both hardware and software A. Operating system B. Software C. Data D. None

A. Operating System

The primary purpose of an operating system is ____ A. To make the most efficient use of the computer hardware B. To allow people to use the computer C. To keep systems programmers employed D. To make computers easier to use

A. To make the most efficient use of the computer hardware

_______ is the first program run on a computer when the computer boots up A. System software B. Operating system C. System operations D. None

B. Operating System

___ is the layer of a computer system between the hardware and the user program A. Operating environment B. Operating system C. System environment D. None

B. Operating system

____ transforms one interface into another interface A. Program B. Software C. Data D. None

B. Software

____ is used in operating system to separate mechanism from policy A. Single level implementation B. Two level implementation C. Multi level implementation D. None

B. Two level implementation

loaded at power-up or reboot◦Stored in ROM or EPROM (known as firmware), Initializes all aspects of system, loads OS kernel and starts execution

Bootstrap Program

Multiprogramming systems A. Are easier to develop than single programming systems B. Execute each job faster C. Execute more jobs in the same time period D. Are used only one large mainframe computers.

C. Execute more jobs in the same time period

_____ system is built directly on the hardware A. Environment B. System C. Operating D. None

C. Operating

copying information into faster storage system

Caching

Linked multiprocessor systems

Clustered systems

controls execution of programs to prevent errors and improper use of computer

Control Program

the one program running at all times on the computer

Kernel

Storage Structure: Definitions: -random access, volatile -extension of main memory That provides large non-volatile storage -divided into tracks which are subdivided into sectors. Disk controller determines logical interaction between the device and the computer. Main Memory Disk Secondary Storage

Main Memory - random access, volatile Disk -divided into tracks which are subdivided into sectors. Disk controller determines logical interaction between the device and the computer. Secondary Storage -extension of main memory That provides large non-volatile storage

Increased throughput, economy of scale, increased reliability

Multiprocessor Systems

Provides efficiency via job scheduling◦When OS has to wait (ex: for I/O), switches to another job

Multiprogramming

program that acts as an intermediary between a user of a computer and the computer hardware

Operating System

mechanism for controlling access of processes or users to resources defined by the OS

Protection

decides between conflicting requests for efficient and fair resource use

Resource allocator

defense of a system against attacks

Security

request to the operating system to allow user to wait for I/O completion

System Call

CPU switches jobs so frequently that each user can interact with each job while it is running (interactive computing)

Time Sharing

T or F: I/O and CPU can execute concurrently

True

one per user, and Group IDs, determine which users and groups of users have which privileges

User IDs