Quiz 1

Question 1

compute-server

Answer 1

provides interface to client to request services

Question 2

file-server

Answer 2

provides interface for clients to store and retrieve files

Question 3

peer-to-peer

Answer 3

broadcast request for service and responds to requests for service via discovery protocol

Question 4

software real-time system

Answer 4

specialized OS; real-time job gets higher priority and maintains it until it completes

Question 5

hardware real-time system

Answer 5

specialized OS; guarantees that real-time jobs complete on time (missile control/robotics) and requires special hardware to implement

Question 6

handheld systems

Answer 6

specialized hardware, lack of virtual memory, limited function with small, very limited OSs

Question 7

OS Components

Answer 7

process management, IO management, main memory management, file & storage management, networking , protection and security, user interface

Question 8

process or job

Answer 8

process is a program in execution; it is a key concept

Question 9

do we need to load the entire program code into memory to execute it?

Answer 9

no

Question 10

tasks of process management:

Answer 10

create, load, execute, suspend, resume, and terminate processes; process scheduling, process communication, process synchronization; allocate/de-allocate resources properly

Question 11

tasks of io management of os

Answer 11

hide the details of hardware devices, maintain and provide device driver interfaces

Question 12

main memory management

Answer 12

maximize memory utilization; map process to physical addresses and loaded into main memory to be executed

Question 13

tasks of main memory management of os

Answer 13

keep track of memory

Question 14

file & storage management

Answer 14

efficient and convenient

Question 15

RAID?

Answer 15

duplicates important data

Question 16

task of storage management

Answer 16

bad block marking, scheduling IO requests

Question 17

protection v security

Answer 17

controlling access of processes or users to resources vs. defense of the system against internal and external attacks

Question 18

shell scripts: interpreted or compiled? consequences?

Answer 18

interpreted, run slower

Question 19

two types of popular classes of shells:

Answer 19

c shell and variants; bourne shell and variants

Question 20

c shell

Answer 20

csh

Question 21

variant c shell

Answer 21

tcsh

Question 22

bourne shell

Answer 22

sh

Question 23

variants

Answer 23

bash, ksh

Question 24

two ways of launching scripts:

Answer 24

direct and indirect interpretation

Question 25

direct interpretation

Answer 25

csh scriptfile [args..]

Question 26

indirect interpretation

Answer 26

``` first line must be: #!/bin/csh ``` must be executable

Question 27

predefined shell variables

Answer 27

$HOME, $PATH

Question 28

environment variables cshell

Answer 28

setenv PRINTER printer1

Question 29

environment variables bourne

Answer 29

PRINTER=printer1

Question 30

set variable c shell

Answer 30

set x = 1

Question 31

set variable in bourne

Answer 31

x=1

Question 32

start c shell scripts

Answer 32

#!/bin/csh

Question 33

bourne bash shell scripts

Answer 33

#!/bin/bash

Question 34

forget beginning shell script line

Answer 34

default shell used

Question 35

end for switches and cases in switch statements

Answer 35

endsw / breaksw

Question 36

goto

Answer 36

Do Not Do: jump unconditionally to a label

Question 37

three types of control statements

Answer 37

conditions, loops, branch

Question 38

conditional in bourne shell script

Answer 38

tests successful, not true or false

Question 39

return code values

Answer 39

0 if successful, non zero if not (1.255)

Question 40

end if statements

Answer 40

fi

Question 41

then required?

Answer 41

yes

Question 42

test

Answer 42

checks validity

Question 43

three kinds of tests

Answer 43

files, strings, integers

Question 44

test alias

Answer 44

[]

Question 45

do-while in bash?

Answer 45

unto do done

Question 46

three ways to pass parameters to os

Answer 46

registers, block, stack

Question 47

40s-early 50s

Answer 47

vacuum tubes, single user, machine language

Question 48

mid 50s early 60s

Answer 48

transistors, punch cards, batch processing, scientific programs

Question 49

batch processing

Answer 49

sequential read of card decks

Question 50

mid 60s to 70s

Answer 50

integrated circuit, multiprogramming, multitasking (time sharing)

Question 51

context switch

Answer 51

mid 60s to 70s

Question 52

80s to present

Answer 52

personal computer and GUI, internet and distributed systems, PCs are too slow to solve heavy CPU scientific problems that require more advanced systems, security and protection

Question 53

multicaching

Answer 53

different cores can store to cache vs. ram

Question 54

multithreading

Answer 54

share cache

Question 55

multicore

Answer 55

cheaper than multi CPUs; each core has its own lvl 1 cache, but they can share lvl 2 cache

Question 56

ethernet

Answer 56

most popular = LAN

Question 57

cluster

Answer 57

multiple computers connected

Question 58

parallel vs distributed

Answer 58

everyone does the same job but simultaneously vs. emphasis functionality + size, different computers runs different applications

Question 59

multiprocessor

Answer 59

share bus, clock, memory, IO; symmetric and asymmetric

Question 60

symmetric

Answer 60

peer structure

Question 61

asymmetric

Answer 61

master/slave structure

Question 62

manycore

Answer 62

GPU (thousands, many thousands: cheaper, simpler)

Question 63

send data from program 1 to program 2?

Answer 63

network, pipe, shared memory

Question 64

cluster and grid systems like multiprocessors

Answer 64

don't share bus

Question 65

software generated interrupt

Answer 65

trap

Question 66

interrupt vector

Answer 66

interrupt transfers control to the interrupt service routine; contains addresses of all the service routines

Question 67

where does OS preserve the state of CPU to serve an interrupt

Answer 67

registers

Question 68

Two IO methods

Answer 68

synchronous vs. asynchronous