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Is it possible to construct a secure operating system for those computer systems which do not provide a privileged mode of operation in hardware?
No, it is not possible to construct a secure operating system for those computer systems which do not provide a privileged mode of operation in hardware.
What is Hardware protection dual mode operation?
define and explain hardware protectoin
What does privileged mode means in arm processor?
Privileged mode in an ARM processor refers to a state of operation where the CPU has access to all system resources and can execute sensitive instructions that control hardware and manage memory. This mode is typically used by the operating system's kernel to perform critical tasks, such as managing interrupts and accessing protected areas of memory. In contrast, user mode restricts access to certain instructions and resources to ensure system stability and security. Transitioning between these modes is essential for maintaining system integrity and enforcing security policies.
Which router mode is accessed by entering the enable mode?
privileged EXEC
Explain the difference between user EXEC and privileged EXEC modes?
Privileged mode has access to the entire router or switch configuration. User EXEC mode only has limited options. Specifically, to do any configuration changes, you need to enter privileged mode first.Privileged mode has access to the entire router or switch configuration. User EXEC mode only has limited options. Specifically, to do any configuration changes, you need to enter privileged mode first.Privileged mode has access to the entire router or switch configuration. User EXEC mode only has limited options. Specifically, to do any configuration changes, you need to enter privileged mode first.Privileged mode has access to the entire router or switch configuration. User EXEC mode only has limited options. Specifically, to do any configuration changes, you need to enter privileged mode first.
What is the router prompt for the privileged EXEC mode?
# or Router#
Which keystrokes can be used to return to privileged mode from the interface configuration mode?
ctrl-p
Difference between context switching and schedulling?
Scheduling has to do with how the job scheduler decides which task will have the CPU and for how long. This is the technique of multi-tasking; the appearance of running multiple processes at the same time (when they really aren't). Context switching occurs when a process needs to do something in a privileged way, such as requiring communication with another hardware device. When the process is typically running it is in user mode, which is a non-privileged mode of operation. It has to context switch into kernel (privileged) mode to do things, then switch back. The main difference between the two is that context switches happen in a non-predictive manner in the same program/process, and job scheduling is predictable (to a point). Then again, they serve different needs of the Operating System, as well.
Does a privileged instruction involves a Context Switch in Unix?
In any environment, in order to execute a privileged instruction you have have to switch from user mode to kernel mode, hence a context switch.
Which prompt is associated with the privileged exec mode?
R1#
What is the difference between the kernel and the user?
Kernel mode is considered a 'privileged' mode, meaning that code executing in that mode can have access to any part of the system, memory, devices, etc. There are no limitations on what it can do. User mode only allows certain operations. Anything requiring any amount of privileged must request the kernel to do things on their behalf. User mode is not a privileged mode and is therefore restrictive in terms of accessing memory, devices, etc.
Examples of privileged instructions used by 8085 processor?
There is no protected mode in the 8085 microprocessor, therefore, there are no instructions that are considered privileged.
