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OS Architecture (MESIIN476125)

OS Architecture (MESIIN476125)

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What is the operation that is needed in order to make available a filesystem for its users

add a journal to the filesystem

set ownership for one user to read and write to the filesystem

check the filesystem consistency

unmount the filesystem

mount the filesystem

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What is a page in Linux memory handling ?

a variable-size area in physical memory

The size of the largest network frame

The size of SSD disk sectors

the size of the bus transfers for peripherals

a variable-size area in virtual memory

the minimal addressable memory area quantum

22%

the minimal allocatable memory area quantum

100%

the size of the L1 cache

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Among the following OS, select those that have micro-kernel architecture

iOS

RIOT

100%

MS-DOS

MacOS X

BSD Unix

Linux

Android

Windows 10

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In which case a task remains in state Zombie ?

It has one or more resources in use

It has one or more parent tasks not terminated

75%

It is still waiting for some locks

It is waiting for sleep or a timer to complete

It has been preempted by an interrupt handler

It has been preempted by another task

It has one or more child tasks not terminated

35%

It has one or more siblings tasks not terminated

It has insufficient priority to complete execution at termination

It has not yet freed all the memory it was using

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Select the item corresponding to each definition below

capability for the OS to elect the running processes among the set of ready toi run processes

capability for the OS to associate a subset of CPUs to execute a given process and its threads

capability for the OS to improve the priority of a process to avoid interlocking

capability for the OS to alter the priority of a process depending on its past usage of resources

capability for the OS to ensure the least priority process will alwais have a chance to use the CPU

capability for the OS to replace a running task by another according to preemption rules or scheduling priorities

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In Linux what is the scheduling class by default for a user-space process ?

SCHED_RR

SCHED_DEADLINE

SCHED_FIFO

SCHED_BASIC

SCHED_NONE

SCHED_OTHER

SCHED_PREEMPT

SCHED_NULL

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What are the elements used by the interrupts in Linux ?

bottom-halves

95%

interrupt controller

100%

top-halves

100%

signals

medium-halves

coroutines

specific scheduling classes

timers

25%

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Select the networked filesystems supported in Linux

ntfs (Windows)

fat (MSDOS)

minix

btrfs

xfs

smb

100%

nfs

100%

ext4

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What are the existing access rights of DAC in Linux ?

read

delete

execute

write+execute

write

full control

read+execute

50%

modify

10%

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