Q:-1 Some early computers protected the operating system by placing it in a memo
ID: 643619 • Letter: Q
Question
Q:-1 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.
Q:-2 Some CPUs provide for more than two modes of operation. What are two possible uses of these multiple modes?
Q:-3 Timers could be used to compute the current time. Provide a short description of how this could be accomplished.
Q:-4 : Is the Internet a LAN or a WAN?
give the answer at least five line for one question
Explanation / Answer
Q:-2 Some CPUs provide for more than two modes of operation. What are two possible uses of these multiple modes?
Answer: Although most systems only distinguish between user and kernel modes, some CPUs have supported multiple modes. Multiple modes could be used to provide a finer-grained security policy. For example, rather than distinguishing between just user and kernel mode, you could distinguish between different types of user mode. Perhaps
users belonging to the same group could execute each other
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