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WorksheetsCSS 05 OS Security
Total questions: 12
Worksheet time: 7mins
Name two types of memory management mechanism.
(a)
What is Temporal Separation?
Process with different security requirements are executed at different times
Different processes use different physical objects
A process cannot access objects outside its permitted domain
Processes conceal their data and computations
What is Physical Separation?
Process with different security requirements are executed at different times
Different processes use different physical objects
A process cannot access objects outside its permitted domain
Processes conceal their data and computations
What is Logical Separation?
Process with different security requirements are executed at different times
Different processes use different physical objects
A process cannot access objects outside its permitted domain
Processes conceal their data and computations
What is Cryptographic Separation?
Process with different security requirements are executed at different times
Different processes use different physical objects
A process cannot access objects outside its permitted domain
Processes conceal their data and computations
Which of the following briefly describe Fixed Fence.
Very restrictive because a predefined amount of space was always reserved for the operating system whether it was needed or not.
If less than the predefined space was required, the excess space was wasted.
If the operating system needed more space, it could grow beyond the fence boundary.
What is the drawback of Fence Register?
(a)
Base Register refers to?
provides a lower bound (starting address)
provides a upper address limit
Bound Register refers to?
provides a lower bound (starting address)
provides a upper address limit
Segmentation will divide program into separate (a)
Which of the following are NOT the main issue in Segmentation?
Each segment has a particular size.
Segment can grow in size during execution
Each segment has an equal size.
In computer storage, (a) is a phenomenon in which storage space is used inefficiently, reducing capacity or performance and often both.
