Explain how using a layered approach to security is required to deal with today’s advanced threats.

(1) Define what you feel is using a layered approach to security as it applies to industrial control systems?

(2) Provide an example of how having two layers of defense might be able to thwart an attack that would have been successful with only one layer.

(3) Explain how perimeter defense systems and interior defense systems can combine to create a layered approach?

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