Operating System Mcqs

Page No. 97

When an attempt is to make a machine or network resource unavailable to its intended users, the attack is called _____________


adenial-of-service attack

✓


bslow read attack

✖


cspoofed attack

✖


dstarvation attack

✖



What is the need of protection?


aPrevent mischievous violation

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bPrevent and intentional

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cEnsure that each program component uses resources allotted to it only

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dAll of the mentioned

✓


View Answer All of the mentioned

What is the principle of least privilege?


aLess privileges provide difficulty in executing admin tasks

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bUsers can get temporary high privilege access

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cUsers should be given just enough privileges to perform their tasks

✓


dNone of the mentioned

✖



What is the main objective of protection?


aEnsure all objects are protected individually

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bObjects have different priority and thus different levels of protection

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cEnsure that each object is accessed correctly and only by allowed processes

✓


dNone of the mentioned

✖



What is the correct way the segmentation program address is stored?


aname, offset

✓


bstart, stop

✖


caccess, rights

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doffset, rights

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View Answer name, offset

What is a major feature of segmentation?


aProgram is divided in data memory and program memory

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bProgram is executed in segments

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cProgram is divided into pieces having different access rights

✓


dIt has effect of an unbounded architecture

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What is best solution to have effect of unbounded number if base/bound registers?


aTagged architecture

✖


bSegmentation

✓


cFence method

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dNone of the mentioned

✖


View Answer Segmentation

What is true regarding tagged architecture?


aEvery word of machine memory has one or more extra bits

✓


bExtra bits are used to do padding

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cExtra bits are not used to identify rights to that word

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dIt is very compatible to code upgrades

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How is disadvantage of all-or-nothing approach overcome?


aBase/Bound

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bRelocation technique

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cFence method

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dTagged architecture

✓


View Answer Tagged architecture

What is all-or-nothing situation for sharing in memory?


aProgram makes all its data available to be accessed

✓


bIt prohibits access to some

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cIt creates rules who can access program memory

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dIt separates program memory and data memory

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