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What are the no-read up and no-write down rules in the context of multi-level security and how do they protect a system's security? What are

  1. What are the no-read up and no-write down rules in the context of multi-level security and how do they protect a system's security?
  2. What are three benefits that can be provided by an intrusion detection system?
  3. Context switching between two processes within an operating system is usually performed by a small assembly language function. Explain context switching and the differences between process and thread context switching?
  4. What is the memory management unit and what is it responsible for?

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