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COP 4610 - Operating Systems questions well answered to pass
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COP 4610 - Operating Systems questions well answered to pass
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COP 4610 - Operating SystemsOperating System (OS) - correct answer ✔✔Software that runs on the bare hardware of a computer and
provides essential support for users to develop and use applications in the most efficient and safe
manner.
Abstraction - correct answer ✔✔The act of removing unimportant details or attributes of objects in
order to construct more general and less complex objects. OSs make extensive use of abstraction by
creating hierarchies of objects where multiple operations at one level are combined into a single
operation at a higher level, thus hiding the details of the implementation and making the operation
easier to use.
Virtualization - correct answer ✔✔The act of creating virtual (rather than physical) versions of a variety
of computing capabilities including hardware platforms, Operating Systems, Storage Devices, and
Networks.
The act of creating the illusion of having one or more objects with more desirable characteristics than
the real object. OSs rely on virtualization to create virtual CPUs, memory, I/O devices, and other system
components that facilitate the work of programmers and users.
Abstraction vs Virtualization - correct answer ✔✔Are closely related.
Abstraction emphasizes unification and simplification by combining multiple simpler objects into more
complex ones.
Virtualization may use abstraction, but emphasizes diversification and replication by creating illusions of
objects with more favorable characteristics.
An OS is thus an extended machine, which provides efficient high-level functions and virtual entities that
liberate the programmer and the user from having to understand details of memory, disk, I/O
management, and other internal processes.
Multiprogramming - correct answer ✔✔A technique that keeps several programs active in memory and
switches execution among the different programs to maximize the use of the CPU and other resources.
Whenever a program enters an I/O-bound phase where little CPU time is needed, other programs can
resume and utilize the CPU in the meantime. Similarly, whenever a device completes an operation, the
OS activates computations that can utilize the now available device.
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