Explain and differentiate programmed and interrupt i/o, Operating System

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Question 1 Explain the structure of operating system in detail

Question 2 Explain the following scheduling algorithm
1) First come First served 2) Shortest Job First

Question 3 Explain first-fit, Best-fit and worst-fit allocation algorithms with an example

Question 4 Explain and differentiate programmed and interrupt I/O

Question 5 Discuss in detail the three major methods of disc space allocation for files

Question 6 Discuss the need for security and protection in computer systems

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