Assignment: Operating Systems
Question One
What are the three reasons that buffering is performed?
Question Two
What is the least privilege principle? Why such a principle aid in the creation of protection systems?
Question Three
Consider the following request queue for disk cylinders:
75, 168, 92, 22, 55, 78, 39, 82, 157, 99
Using following disk scheduling algorithms, find the total head movements using schematic diagram for a disk of 200 cylinders (0-199). It is assumed that read write head is initially present at cylinder number 50.
a. First Come First Serve (FCFS)
b. Shortest Seek Time First (SSTF)
Question Four
Why is DMA used for devices that execute large transfers?
Format your assignment according to the following formatting requirements:
1. The answer should be typed, double spaced, using Times New Roman font (size 12), with one-inch margins on all sides.
2. The response also include a cover page containing the title of the assignment, the student's name, the course title, and the date. The cover page is not included in the required page length.
3. Also Include a reference page. The Citations and references should follow APA format. The reference page is not included in the required page length.