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This section is a true history lesson CPU Modes and Protection Rings. You'll learn about layered architecture, its relationship to legacy systems and how & why those legacy concepts are still in play and how they affect object-oriented trust relationships. Part 3.1 Our next section introduces Protection Mechanism. You'll learn how to manage layers of protections amongst assets and resources, and why isolation and treating each as its own environment is a key strategy. We'll also discuss the two main protection areas of system architecture and how those components function.