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OS Protection
What is the basic need in protecting memory in multi-user environment?
We need two registers one ‘start’ and other ‘end’
We need a variable register
A fence register has to be used known as base register.
None of the mentioned
Author:
rikazzz
Comment
OS Protection
What is the correct way the segmentation program address is stored?
name, offset
start, stop
access, rights
offset, rights
OS can retrieve the real address via looking for the table then making a simple calculation: address of the name + offset.
Author:
rikazzz
Comment
OS Protection
What is correct regarding ‘relocation’ w.r.t protecting memory?
It is a process of taking a program as if it began at address 0
It is a process of taking a program as if it began at address 0A
Fence cannot be used within relocation process
All of the mentioned
Author:
rikazzz
Comment
OS Protection
What are the various roles of protection?
It is used to detect errors which can prevent contamination of system
It is used used to accelerate a process
It is used to optimize system downtime
None of the mentioned
Author:
rikazzz
Comment
OS Protection
What is true regarding tagged architecture?
Every word of machine memory has one or more extra bits
Extra bits are used to do padding
Extra bits are not used to identify rights to that word
It is very compatible to code upgrades
Author:
rikazzz
Comment
OS Protection
What is not true regarding ‘Fence’?
It is implemented via hardware register
It doesn’t protect users from each other
It good to protect OS from abusive users
Its implementation is unrestricted and can take any amount of space in Operating system.
Author:
rikazzz
Comment
OS Protection
For a domain _______ is a list of objects together with the operation allowed on these objects.
capability list
access list
both capability and access list
none of the mentioned
Author:
rikazzz
Comment
OS Protection
What are the three additional operations to change the contents of the access-matrix?
copy
Owner
control
all of the mentioned
Author:
rikazzz
Comment
OS Protection
Why is it difficult to revoke capabilities?
They are too many
They are not defined precicely
They are distributed throughout the system
None of the mentioned
Author:
rikazzz
Comment
OS Protection
What are the incorrect methods of revocation of access rights?
Immediate/Delayed
Selective/General
Partial/total
Crucial
Author:
rikazzz
Comment
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