Memory Protection - Operating System Questions & Answers

1.

What is main objective of protection ?

   A.) Ensure all objects are protected individually
   B.) Objects have different priority and thus different levels of protection
   C.) Ensure that each object is accessed correctly and only by allowed processes
   D.) None of the mentioned

Answer: Option 'C'

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

2.

What is true regarding tagged architecture ?

   A.) Every word of machine memory has one or more extra bits
   B.) Extra bits are used to do padding
   C.) Extra bits are not used to identify rights to that word
   D.) It is very compatible to code upgrades

Answer: Option 'A'

Every word of machine memory has one or more extra bits

3.

What is correct way the segmentation program address is stored ?

   A.) name, offset
   B.) start, stop
   C.) access, rights
   D.) offset, rights

Answer: Option 'A'

OS can retrieve the real address via looking for the table then making a simple calculation : address of the name + offset.

4.

What is true regarding ‘Fence’ ?

   A.) Its a method to confine users to one side of a boundary
   B.) It can protect Operating system from one user
   C.) It cannot protect users from each other
   D.) All of the mentioned

Answer: Option 'D'

All of the mentioned

5.

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

   A.) Base/Bound
   B.) Relocation technique
   C.) Fence method
   D.) Tagged architecture

Answer: Option 'D'

Tagged architecture

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