How does the distinction between kernel mode and user

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1.5 How does the distinction between kernel mode and user mode function as a rudimentary form of protection (security) system? 1.6 Which of the following instructions should be privileged? 1.7 Some early computers protected the operating system by placing it in a memory partition that could not be modified by either the user job or the operating system itself. Describe two difficulties that you think could arise with such a scheme. Answer: For Solved Question Papers of UGC-NET/GATE/SET/PGCET in Computer Science, visit VTUNOTESBYSRI
Practice Exercises 3 The data required by the operating system (passwords, access controls, accounting information, and so on) would have to be stored in or passed through unprotected memory and thus be accessible to unauthorized users. 1.8 Some CPU s provide for more than two modes of operation. What are two possible uses of these multiple modes?

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